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While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Hydrogen and Sulfur Production from Hydrogen Sulfide Wastes  

E-Print Network (OSTI)

HYDROGEN AND SULFUR PRODUCTION FROM HYDROGEN SULFIDE WASTES? John B.L. Harkness and Richard D. Doctor, Argonne National Laboratory, Argonne. IL ABSTRACT A new hydrogen sulfide waste-treatment process that uses microwave plasma... to be economically competitive. In addition, the experiments show-that. typical refinery acid-gas streams are compatible with the plasma process and that all by-products can be treated with existing technology. BACKGROUND In 1987, Argonne staff found the first...

Harkness, J.; Doctor, R. D.

2

Understanding of hydrogen silsesquioxane electron resist for sub-5-nm-half-pitch lithography  

E-Print Network (OSTI)

The authors, demonstrated that 4.5-nm-half-pitch structures could be achieved using electron-beam lithography, followed by salty development. They also hypothesized a development mechanism for hydrogen silsesquioxane, ...

Berggren, Karl K.

3

The development of autocatalytic structural materials for use in the sulfur-iodine process for the production of hydrogen .  

E-Print Network (OSTI)

??The Sulfur-Iodine Cycle for the thermochemical production of hydrogen offers many benefits to traditional methods of hydrogen production. As opposed to steam methane reforming -… (more)

Miu, Kevin (Kevin K.)

2006-01-01T23:59:59.000Z

4

Development of Efficient Flowsheet and Transient Modeling for Nuclear Heat Coupled Sulfur Iodine Cyclefor Hydrogen Production  

SciTech Connect

The realization of the hydrogen as an energy carrier for future power sources relies on a practical method of producing hydrogen in large scale with no emission of green house gases. Hydrogen is an energy carrier which can be produced by a thermochemical water splitting process. The Sulfur-Iodine (SI) process is an example of a water splitting method using iodine and sulfur as recycling agents.

Shripad T. Revankar; Nicholas R. Brown; Cheikhou Kane; Seungmin Oh

2010-05-01T23:59:59.000Z

5

Effective hydrogen generation and resource circulation based on sulfur cycle system  

SciTech Connect

For the effective hydrogen generation from H{sub 2}S, it should be compatible that the increscent of the photocatalytic (or electrochemical) activities and the development of effective utilization method of by-products (poly sulfide ion). In this study, “system integration” to construct the sulfur cycle system, which is compatible with the increscent of the hydrogen and or electron energy generation ratio and resource circulation, is investigated. Photocatalytic hydrogen generation rate can be enhanced by using stratified photocatalysts. Photo excited electron can be transpired to electrode to convert the electron energy to hydrogen energy. Poly sulfide ion as the by-products can be transferred into elemental sulfur and/or industrial materials such as rubber. Moreover, elemental sulfur can be transferred into H{sub 2}S which is the original materials for hydrogen generation. By using this “system integration”, the sulfur cycle system for the new energy generation can be constructed.

Takahashi, Hideyuki; Mabuchi, Takashi; Hayashi, Tsugumi; Yokoyama, Shun; Tohji, Kazuyuki [Graduate School of Environmental Studies, Tohoku University 6-6-20, Aramaki, Aoba-ku, Sendai, 980-8579 (Japan)

2013-12-10T23:59:59.000Z

6

RECENT ADVANCES IN THE DEVELOPMENT OF THE HYBRID SULFUR PROCESS FOR HYDROGEN PRODUCTION  

SciTech Connect

Thermochemical processes are being developed to provide global-scale quantities of hydrogen. A variant on sulfur-based thermochemical cycles is the Hybrid Sulfur (HyS) Process, which uses a sulfur dioxide depolarized electrolyzer (SDE) to produce the hydrogen. In the HyS Process, sulfur dioxide is oxidized in the presence of water at the electrolyzer anode to produce sulfuric acid and protons. The protons are transported through a cation-exchange membrane electrolyte to the cathode and are reduced to form hydrogen. In the second stage of the process, the sulfuric acid by-product from the electrolyzer is thermally decomposed at high temperature to produce sulfur dioxide and oxygen. The two gases are separated and the sulfur dioxide recycled to the electrolyzer for oxidation. The Savannah River National Laboratory (SRNL) has been exploring a fuel-cell design concept for the SDE using an anolyte feed comprised of concentrated sulfuric acid saturated with sulfur dioxide. The advantages of this design concept include high electrochemical efficiency and small footprint compared to a parallel-plate electrolyzer design. This paper will provide a summary of recent advances in the development of the SDE for the HyS process.

Hobbs, D.

2010-07-22T23:59:59.000Z

7

Sulfur surface chemistry on the platinum gate of a silicon carbide based hydrogen sensor  

E-Print Network (OSTI)

monitoring, solid-oxide fuel cells, and coal gasification, require operation at much higher temperatures thanSulfur surface chemistry on the platinum gate of a silicon carbide based hydrogen sensor Yung Ho to hydrogen sulfide, even in the presence of hydrogen or oxygen at partial pressures of 20­600 times greater

Tobin, Roger G.

8

Performance of Sulfur Tolerant Reforming Catalysts for Production of Hydrogen from Jet Fuel Simulants  

E-Print Network (OSTI)

,2 operated by fuel cells. Unfortunately, the lack of infrastructure, such as a network of hydrogen refueling of hydrogen sulfide (H2S), which poisons the anode in the fuel cell stack, leading to low SOFC efficiencyPerformance of Sulfur Tolerant Reforming Catalysts for Production of Hydrogen from Jet Fuel

Azad, Abdul-Majeed

9

ENERGY EFFICIENCY LIMITS FOR A RECUPERATIVE BAYONET SULFURIC ACID DECOMPOSITION REACTOR FOR SULFUR CYCLE THERMOCHEMICAL HYDROGEN PRODUCTION  

SciTech Connect

A recuperative bayonet reactor design for the high-temperature sulfuric acid decomposition step in sulfur-based thermochemical hydrogen cycles was evaluated using pinch analysis in conjunction with statistical methods. The objective was to establish the minimum energy requirement. Taking hydrogen production via alkaline electrolysis with nuclear power as the benchmark, the acid decomposition step can consume no more than 450 kJ/mol SO{sub 2} for sulfur cycles to be competitive. The lowest value of the minimum heating target, 320.9 kJ/mol SO{sub 2}, was found at the highest pressure (90 bar) and peak process temperature (900 C) considered, and at a feed concentration of 42.5 mol% H{sub 2}SO{sub 4}. This should be low enough for a practical water-splitting process, even including the additional energy required to concentrate the acid feed. Lower temperatures consistently gave higher minimum heating targets. The lowest peak process temperature that could meet the 450-kJ/mol SO{sub 2} benchmark was 750 C. If the decomposition reactor were to be heated indirectly by an advanced gas-cooled reactor heat source (50 C temperature difference between primary and secondary coolants, 25 C minimum temperature difference between the secondary coolant and the process), then sulfur cycles using this concept could be competitive with alkaline electrolysis provided the primary heat source temperature is at least 825 C. The bayonet design will not be practical if the (primary heat source) reactor outlet temperature is below 825 C.

Gorensek, M.; Edwards, T.

2009-06-11T23:59:59.000Z

10

Sulfur Iodine Process Summary for the Hydrogen Technology Down-Selection: Process Performance Package  

SciTech Connect

This document describes the details of implementing a Sulfur-Iodine (S-I) hydrogen production plant to deploy with the Next General Nuclear Power Plant (NGNP). Technical requirements and specifications are included, and a conceptual plant design is presented. The following areas of interest are outlined in particular as a baseline for the various technology comparisons: (1) Performance Criteria - (a) Quantity of hydrogen produced, (b) Purity of hydrogen produced, (c) Flexibility to serve various applications, (d) Waste management; (2) Economic Considerations - (a) Cost of hydrogen, (b) Development costs; and (3) Risk - (a) Technical maturity of the S-I process, (b) Development risk, (c) Scale up options.

Benjamin Russ

2009-06-01T23:59:59.000Z

11

Heat Transfer Characteristics of Sulfur and Sulfur Diluted with Hydrogen Sulfide Flowing Through Circular Tubes  

E-Print Network (OSTI)

is called the pumping-power advantage factor, and has the value 2. 5 x 10 for sodium. The only metals having a higher value of H are 13 lithium 7 and bismuth. Lithium 7 comprises 92. 5% of natural lithium, but the cost of separating it from lithium 6...-section for thermal neutrons being 0. 130 barns. For comparison, water has an absorption cross-section of 0. 58 barns for thermal neutrons (2) . Sulfur is not activated by exposure to neutron flux in such a way as to produce a radioactive isotope which...

Stone, Porter Walwyn

1960-01-01T23:59:59.000Z

12

TPCP: Pitch canker PITCH CANKER  

E-Print Network (OSTI)

TPCP: Pitch canker PITCH CANKER INTRODUCTION Pitch canker is one of the most serious threats crown. Large amounts of pitch accumulate on and below the cankers. The wood beneath the cankers is deeply pitch soaked, often to the pith. This characteristic distinguishes pitch canker, from cankers

13

Conversion of Hydrogen Sulfide in Coal Gases to Liquid Elemental Sulfur with Monolithic Catalysts  

SciTech Connect

Removal of hydrogen sulfide (H{sub 2}S) from coal gasifier gas and sulfur recovery are key steps in the development of Department of Energy's (DOE's) advanced power plants that produce electric power and clean transportation fuels with coal and natural gas. These plants will require highly clean coal gas with H{sub 2}S below 1 ppmv and negligible amounts of trace contaminants such as hydrogen chloride, ammonia, alkali, heavy metals, and particulate. The conventional method of sulfur removal and recovery employing amine, Claus, and tail-gas treatment is very expensive. A second generation approach developed under DOE's sponsorship employs hot-gas desulfurization (HGD) using regenerable metal oxide sorbents followed by Direct Sulfur Recovery Process (DSRP). However, this process sequence does not remove trace contaminants and is targeted primarily towards the development of advanced integrated gasification combined cycle (IGCC) plants that produce electricity (not both electricity and transportation fuels). There is an immediate as well as long-term need for the development of cleanup processes that produce highly clean coal gas for next generation power plants. To this end, a novel process is now under development at several research organizations in which the H{sub 2} in coal gas is directly oxidized to elemental sulfur over a selective catalyst. Such a process is ideally suited for coal gas from commercial gasifiers with a quench system to remove essentially all the trace contaminants except H{sub 2}S In the Single-Step Sulfur Recovery Process (SSRP), the direct oxidation of H{sub 2}S to elemental sulfur in the presence of SO{sub 2} is ideally suited for coal gas from commercial gasifiers with a quench system to remove essentially all the trace contaminants except H{sub 2}S. This direct oxidation process has the potential to produce a super clean coal gas more economically than both conventional amine-based processes and HGD/DSRP. The H{sub 2} and CO components of syngas appear to behave as inert with respect to sulfur formed at the SSRP conditions. One problem in the SSRP process that needs to be eliminated or minimized is COS formation that may occur due to reaction of CO with sulfur formed from the Claus reaction. The objectives of this research are to formulate monolithic catalysts for removal of H{sub 2}S from coal gases and minimum formation of COS with monolithic catalyst supports, {gamma}-alumina wash or carbon coats, and catalytic metals, to develop a catalytic regeneration method for a deactivated monolithic catalyst, to measure kinetics of both direct oxidation of H{sub 2}S to elemental sulfur with SO{sub 2} as an oxidizer and formation of COS in the presence of a simulated coal gas mixture containing H{sub 2}, CO, CO{sub 2}, and moisture, using a monolithic catalyst reactor, and to develop kinetic rate equations and model the direct oxidation process to assist in the design of large-scale plants. This heterogeneous catalytic reaction has gaseous reactants such as H{sub 2}S and SO{sub 2}. However, this heterogeneous catalytic reaction has heterogeneous products such as liquid elemental sulfur and steam. To achieve the above-mentioned objectives using a monolithic catalyst reactor, experiments on conversion of hydrogen sulfide into elemental sulfur and formation of COS were carried out for the space time range of 40-560 seconds at 120-150 C to evaluate effects of reaction temperatures, total pressure, space time, and catalyst regeneration on conversion of hydrogen sulfide into elemental sulfur and formation of COS. Simulated coal gas mixtures consist of 3,600-4,000-ppmv hydrogen sulfide, 1,800-2,000 ppmv sulfur dioxide, 23-27 v% hydrogen, 36-41 v% CO, 10-12 v% CO{sub 2}, 0-10 vol % moisture, and nitrogen as remainder. Volumetric feed rates of a simulated coal gas mixture to the reactor are 30-180 SCCM. The temperature of the reactor is controlled in an oven at 120-150 C. The pressure of the reactor is maintained at 40-210 psia. The molar ratio of H{sub 2}S to SO{sub 2} in the monolithic catalyst reactor is mai

K. C. Kwon

2006-09-30T23:59:59.000Z

14

Selective Catalytic Oxidation of Hydrogen Sulfide to Elemental Sulfur from Coal-Derived Fuel Gases  

SciTech Connect

The development of low cost, highly efficient, desulfurization technology with integrated sulfur recovery remains a principle barrier issue for Vision 21 integrated gasification combined cycle (IGCC) power generation plants. In this plan, the U. S. Department of Energy will construct ultra-clean, modular, co-production IGCC power plants each with chemical products tailored to meet the demands of specific regional markets. The catalysts employed in these co-production modules, for example water-gas-shift and Fischer-Tropsch catalysts, are readily poisoned by hydrogen sulfide (H{sub 2}S), a sulfur contaminant, present in the coal-derived fuel gases. To prevent poisoning of these catalysts, the removal of H{sub 2}S down to the parts-per-billion level is necessary. Historically, research into the purification of coal-derived fuel gases has focused on dry technologies that offer the prospect of higher combined cycle efficiencies as well as improved thermal integration with co-production modules. Primarily, these concepts rely on a highly selective process separation step to remove low concentrations of H{sub 2}S present in the fuel gases and produce a concentrated stream of sulfur bearing effluent. This effluent must then undergo further processing to be converted to its final form, usually elemental sulfur. Ultimately, desulfurization of coal-derived fuel gases may cost as much as 15% of the total fixed capital investment (Chen et al., 1992). It is, therefore, desirable to develop new technology that can accomplish H{sub 2}S separation and direct conversion to elemental sulfur more efficiently and with a lower initial fixed capital investment.

Gardner, Todd H.; Berry, David A.; Lyons, K. David; Beer, Stephen K.; Monahan, Michael J.

2001-11-06T23:59:59.000Z

15

Conversion of Hydrogen Sulfide in Coal Gases to Liquid Elemental Sulfur with Monolithic Catalysts  

SciTech Connect

Removal of hydrogen sulfide (H{sub 2}S) from coal gasifier gas and sulfur recovery are key steps in the development of Department of Energy's (DOE's) advanced power plants that produce electric power and clean transportation fuels with coal and natural gas. These plants will require highly clean coal gas with H{sub 2}S below 1 ppmv and negligible amounts of trace contaminants such as hydrogen chloride, ammonia, alkali, heavy metals, and particulate. The conventional method of sulfur removal and recovery employing amine, Claus, and tail-gas treatment is very expensive. A second generation approach developed under DOE's sponsorship employs hot-gas desulfurization (HGD) using regenerable metal oxide sorbents followed by Direct Sulfur Recovery Process (DSRP). However, this process sequence does not remove trace contaminants and is targeted primarily towards the development of advanced integrated gasification combined cycle (IGCC) plants that produce electricity (not both electricity and transportation fuels). There is an immediate as well as long-term need for the development of cleanup processes that produce highly clean coal gas for next generation power plants. To this end, a novel process is now under development at several research organizations in which the H{sub 2}S in coal gas is directly oxidized to elemental sulfur over a selective catalyst. Such a process is ideally suited for coal gas from commercial gasifiers with a quench system to remove essentially all the trace contaminants except H{sub 2}S In the Single-Step Sulfur Recovery Process (SSRP), the direct oxidation of H{sub 2}S to elemental sulfur in the presence of SO{sub 2} is ideally suited for coal gas from commercial gasifiers with a quench system to remove essentially all the trace contaminants except H{sub 2}S. This direct oxidation process has the potential to produce a super clean coal gas more economically than both conventional amine-based processes and HGD/DSRP. The H{sub 2} and CO components of syngas appear to behave as inert with respect to sulfur formed at the SSRP conditions. One problem in the SSRP process that needs to be eliminated or minimized is COS formation that may occur due to reaction of CO with sulfur formed from the Claus reaction. The objectives of this research are to formulate monolithic catalysts for removal of H{sub 2}S from coal gases and minimum formation of COS with monolithic catalyst supports, {gamma}-alumina wash or carbon coats, and catalytic metals, to develop a catalytic regeneration method for a deactivated monolithic catalyst, to measure kinetics of both direct oxidation of H{sub 2}S to elemental sulfur with SO{sub 2} as an oxidizer and formation of COS in the presence of a simulated coal gas mixture containing H{sub 2}, CO, CO{sub 2}, and moisture, using a monolithic catalyst reactor, and to develop kinetic rate equations and model the direct oxidation process to assist in the design of large-scale plants. This heterogeneous catalytic reaction has gaseous reactants such as H{sub 2}S and SO{sub 2}. However, this heterogeneous catalytic reaction has heterogeneous products such as liquid elemental sulfur and steam. Experiments on conversion of hydrogen sulfide into elemental sulfur and formation of COS were carried out for the space time range of 130-156 seconds at 120-140 C to formulate catalysts suitable for the removal of H{sub 2}S and COS from coal gases, evaluate removal capabilities of hydrogen sulfide and COS from coal gases with formulated catalysts, and develop an economic regeneration method of deactivated catalysts. Simulated coal gas mixtures consist of 3,300-3,800-ppmv hydrogen sulfide, 1,600-1,900 ppmv sulfur dioxide, 18-21 v% hydrogen, 29-34 v% CO, 8-10 v% CO{sub 2}, 5-18 vol % moisture, and nitrogen as remainder. Volumetric feed rates of a simulated coal gas mixture to the reactor are 114-132 SCCM. The temperature of the reactor is controlled in an oven at 120-140 C. The pressure of the reactor is maintained at 116-129 psia. The molar ratio of H{sub 2}S to SO{sub 2} in the monolithic catalyst reactor is

K. C. Kwon

2007-09-30T23:59:59.000Z

16

Conversion of Hydrogen Sulfide in Coal Gases to Liquid Elemental Sulfur with Monolithic Catalysts  

SciTech Connect

Removal of hydrogen sulfide (H{sub 2}S) from coal gasifier gas and sulfur recovery are key steps in the development of Department of Energy's (DOE's) advanced power plants that produce electric power and clean transportation fuels with coal and natural gas. These plants will require highly clean coal gas with H{sub 2}S below 1 ppmv and negligible amounts of trace contaminants such as hydrogen chloride, ammonia, alkali, heavy metals, and particulate. The conventional method of sulfur removal and recovery employing amine, Claus, and tail-gas treatment is very expensive. A second generation approach developed under DOE's sponsorship employs hot-gas desulfurization (HGD) using regenerable metal oxide sorbents followed by Direct Sulfur Recovery Process (DSRP). However, this process sequence does not remove trace contaminants and is targeted primarily towards the development of advanced integrated gasification combined cycle (IGCC) plants that produce electricity (not both electricity and transportation fuels). There is an immediate as well as long-term need for the development of cleanup processes that produce highly clean coal gas for next generation power plants. To this end, a novel process is now under development at several research organizations in which the H{sub 2}S in coal gas is directly oxidized to elemental sulfur over a selective catalyst. Such a process is ideally suited for coal gas from commercial gasifiers with a quench system to remove essentially all the trace contaminants except H{sub 2}S In the Single-Step Sulfur Recovery Process (SSRP), the direct oxidation of H{sub 2}S to elemental sulfur in the presence of SO{sub 2} is ideally suited for coal gas from commercial gasifiers with a quench system to remove essentially all the trace contaminants except H{sub 2}S. This direct oxidation process has the potential to produce a super clean coal gas more economically than both conventional amine-based processes and HGD/DSRP. The H{sub 2} and CO components of syngas appear to behave as inert with respect to sulfur formed at the SSRP conditions. One problem in the SSRP process that needs to be eliminated or minimized is COS formation that may occur due to reaction of CO with sulfur formed from the Claus reaction. The objectives of this research are to formulate monolithic catalysts for removal of H{sub 2}S from coal gases and minimum formation of COS with monolithic catalyst supports, {gamma}-alumina wash coat, and catalytic metals, to develop a regeneration method for a deactivated monolithic catalyst, to measure kinetics of both direct oxidation of H{sub 2}S to elemental sulfur with SO{sub 2} as an oxidizer and formation of COS in the presence of a simulated coal gas mixture containing H{sub 2}, CO, CO{sub 2}, and moisture, using a monolithic catalyst reactor. The task of developing kinetic rate equations and modeling the direct oxidation process to assist in the design of large-scale plants will be abandoned since formulation of catalysts suitable for the removal of H{sub 2}S and COS is being in progress. This heterogeneous catalytic reaction has gaseous reactants such as H{sub 2}S and SO{sub 2}. However, this heterogeneous catalytic reaction has heterogeneous products such as liquid elemental sulfur and steam. Experiments on conversion of hydrogen sulfide into elemental sulfur and formation of COS were carried out for the space time range of 46-570 seconds under reaction conditions to formulate catalysts suitable for the removal of H{sub 2}S and COS from coal gases and evaluate their capabilities in reducing hydrogen sulfide and COS in coal gases. Simulated coal gas mixtures consist of 3,200-4,000-ppmv hydrogen sulfide, 1,600-20,000-ppmv sulfur dioxide, 18-27 v% hydrogen, 29-41 v% CO, 8-12 v% CO{sub 2}, 0-10 vol % moisture, and nitrogen as remainder. Volumetric feed rates of simulated coal gas mixtures to the reactor are 30 - 180 cm{sup 3}/min at 1 atm and 25 C (SCCM). The temperature of the reactor is controlled in an oven at 120-155 C. The pressure of the reactor is maintained at 40-210 psia. The molar ratio

K.C. Kwon

2009-09-30T23:59:59.000Z

17

Evaluation of pitches and cokes from solvent-extracted coal materials  

SciTech Connect

Three initial coal-extracted (C-E) samples were received from the West Virginia University (WVU) Chemical Engineering Department. Two samples had been hydrogenated to obtain pitches that satisfy Theological requirements. One of the hydrogenated (HC-E) samples had been extracted by toluene to remove ash and higher molecular weight aromatic compounds. We were unable to measure the softening point and viscosity of the non-hydro treated solid extract sample, Positive characteristics in the HC-E materials were softening points of 113-119{degrees}C, low sulfur and ash. The oxygen and nitrogen content of the HC-E samples may limit future usage in premium carbon and graphite products. Coking values were similar to petroleum pitches. Laboratory anode testing indicates that in combination with standard coal-tar pitch, the HC-E material can be used as a binder pitch.

McHenry, E.R.

1996-12-01T23:59:59.000Z

18

Efficient Conversion of Thermal Energy into Hydrogen: Comparing Two Methods to Reduce Exergy Losses in a Sulfuric Acid Decomposition Reactor  

Science Journals Connector (OSTI)

Efficient Conversion of Thermal Energy into Hydrogen: Comparing Two Methods to Reduce Exergy Losses in a Sulfuric Acid Decomposition Reactor ... The first design uses optimal control theory to obtain a more uniform distribution of the entropy production. ... This optimized design is found to perform the best, but it requires significant changes in the heating equipment in order to approximately realize the optimal temperature profiles. ...

Leen V. van der Ham; Joachim Gross; Ad Verkooijen; Signe Kjelstrup

2009-08-06T23:59:59.000Z

19

Interface magnetism of iron grown on sulfur and hydrogen passivated GaAs(001)  

SciTech Connect

Sulfur (S) and hydrogen (H) atom passivated GaAs(001) templates were used for deposition of ultrathin crystalline Fe films using molecular beam epitaxy, where the Fe thickness ranged from 10 to 45 atomic layers. Reflection high-energy electron diffraction patterns showed that the S- and H-passivated surfaces had no and very weak (1 x 2) superlattice reconstructions, respectively. This indicates that these GaAs(001) templates have a square-like symmetry. Magnetic anisotropies were investigated using the in-plane angular dependence of ferromagnetic resonance at 36 GHz. The in-plane cubic and uniaxial anisotropies and perpendicular uniaxial field were described by bulk and interface contributions, indicating that the Fe films have a high lattice coherence. The magnetic properties of the Fe films were compared to those grown on more commonly used GaAs(001) templates having a (4 x 6) reconstruction with an As-rich in-plane uniaxial symmetry. The Fe films grown on S-passivated templates exhibited unique magnetic properties caused by a decreased lattice spacing compared to the bulk Fe.

Kardasz, B.; Watkins, S. P.; Montoya, E. A.; Burrowes, C.; Girt, E.; Heinrich, B.

2012-04-01T23:59:59.000Z

20

Calcium looping process for high purity hydrogen production integrated with capture of carbon dioxide, sulfur and halides  

DOE Patents (OSTI)

A process for producing hydrogen comprising the steps of: (i) gasifying a fuel into a raw synthesis gas comprising CO, hydrogen, steam, sulfur and halide contaminants in the form of H.sub.2S, COS, and HX, wherein X is a halide; (ii) passing the raw synthesis gas through a water gas shift reactor (WGSR) into which CaO and steam are injected, the CaO reacting with the shifted gas to remove CO.sub.2, sulfur and halides in a solid-phase calcium-containing product comprising CaCO.sub.3, CaS and CaX.sub.2; (iii) separating the solid-phase calcium-containing product from an enriched gaseous hydrogen product; and (iv) regenerating the CaO by calcining the solid-phase calcium-containing product at a condition selected from the group consisting of: in the presence of steam, in the presence of CO.sub.2, in the presence of synthesis gas, in the presence of H.sub.2 and O.sub.2, under partial vacuum, and combinations thereof.

Ramkumar, Shwetha; Fan, Liang-Shih

2013-07-30T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Effect of Water Transport on the Production of Hydrogen and Sulfuric Acid in a PEM Electrolyzer  

E-Print Network (OSTI)

be developed that provides efficient production of clean hydrogen. The methods existing today for large-scale produc- tion of hydrogen typically involve hydrocarbon reforming of natural gas or coal gasification% , the overall efficiency is 40%.7 Two issues remain, however, that make the future of this technology un

Weidner, John W.

22

Sulfur incorporation into copper indium diselenide single crystals through annealing in hydrogen sulfide  

SciTech Connect

CuInSe{sub 2} crystals were sulfurized in a H{sub 2}S-Ar gas mixture at 575 deg. C. The focus was on the resulting mass transport, in particular, on the interdiffusion of Se and S. Experiments were done for various sulfurization times, and the resulting S distribution was measured by Auger electron spectroscopy sputter depth profiling and analyzed with the Boltzmann-Matano method. A one-dimensional diffusion process had shaped the S distribution in these crystals. The respective diffusion coefficient was on the order of 10{sup -16} cm{sup 2}/s, and it varied only slightly with the S content in CuIn(Se,S){sub 2}.

Titus, Jochen; Birkmire, Robert W.; Hack, Christina; Mueller, Georg; McKeown, Patrick [Institute of Energy Conversion, University of Delaware, Newark, Delaware 19716 (United States); Crystal Growth Laboratory, Department of Materials Science, University of Erlangen-Nuernberg (Germany); Evans East, Princeton, New Jersey 08520 (United States)

2006-02-15T23:59:59.000Z

23

Transcriptome for Photobiological Hydrogen Production Induced by Sulfur Deprivation in the Green Alga Chlamydomonas reinhardtii  

Science Journals Connector (OSTI)

...storage in the monocellular alga Chlamydomonas reinhardtii...202-204. 6 Chisti, Y. 2007. Biodiesel from microalgae. Biotechnol...hydrogenase from the green-alga Chlamydomonas reinhardtii...hydrogen metabolism of the green alga Chlamydomonas reinhardtii...

Anh Vu Nguyen; Skye R. Thomas-Hall; Alizée Malnoë; Matthew Timmins; Jan H. Mussgnug; Jens Rupprecht; Olaf Kruse; Ben Hankamer; Peer M. Schenk

2008-08-15T23:59:59.000Z

24

Effect of Sulfur Compounds and Higher Homologues of Methane on Hydrogen Cyanide Production by the Andrussow Method  

Science Journals Connector (OSTI)

The influence of sulfur compounds, higher homologues of methane on the parameters ofoxidative ammonolysis of methane was studied.

N. V. Trusov

2001-10-01T23:59:59.000Z

25

HYBRID SULFUR CYCLE FLOWSHEETS FOR HYDROGEN PRODUCTION USING HIGH-TEMPERATURE GAS-COOLED REACTORS  

SciTech Connect

Two hybrid sulfur (HyS) cycle process flowsheets intended for use with high-temperature gas-cooled reactors (HTGRs) are presented. The flowsheets were developed for the Next Generation Nuclear Plant (NGNP) program, and couple a proton exchange membrane (PEM) electrolyzer for the SO2-depolarized electrolysis step with a silicon carbide bayonet reactor for the high-temperature decomposition step. One presumes an HTGR reactor outlet temperature (ROT) of 950 C, the other 750 C. Performance was improved (over earlier flowsheets) by assuming that use of a more acid-tolerant PEM, like acid-doped poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole] (PBI), instead of Nafion{reg_sign}, would allow higher anolyte acid concentrations. Lower ROT was accommodated by adding a direct contact exchange/quench column upstream from the bayonet reactor and dropping the decomposition pressure. Aspen Plus was used to develop material and energy balances. A net thermal efficiency of 44.0% to 47.6%, higher heating value basis is projected for the 950 C case, dropping to 39.9% for the 750 C case.

Gorensek, M.

2011-07-06T23:59:59.000Z

26

High Purity Hydrogen Production with In-Situ Carbon Dioxide and Sulfur Capture in a Single Stage Reactor  

SciTech Connect

Enhancement in the production of high purity hydrogen (H{sub 2}) from fuel gas, obtained from coal gasification, is limited by thermodynamics of the water gas shift (WGS) reaction. However, this constraint can be overcome by conducting the WGS in the presence of a CO{sub 2}-acceptor. The continuous removal of CO{sub 2} from the reaction mixture helps to drive the equilibrium-limited WGS reaction forward. Since calcium oxide (CaO) exhibits high CO{sub 2} capture capacity as compared to other sorbents, it is an ideal candidate for such a technique. The Calcium Looping Process (CLP) developed at The Ohio State University (OSU) utilizes the above concept to enable high purity H{sub 2} production from synthesis gas (syngas) derived from coal gasification. The CLP integrates the WGS reaction with insitu CO{sub 2}, sulfur and halide removal at high temperatures while eliminating the need for a WGS catalyst, thus reducing the overall footprint of the hydrogen production process. The CLP comprises three reactors - the carbonator, where the thermodynamic constraint of the WGS reaction is overcome by the constant removal of CO{sub 2} product and high purity H{sub 2} is produced with contaminant removal; the calciner, where the calcium sorbent is regenerated and a sequestration-ready CO{sub 2} stream is produced; and the hydrator, where the calcined sorbent is reactivated to improve its recyclability. As a part of this project, the CLP was extensively investigated by performing experiments at lab-, bench- and subpilot-scale setups. A comprehensive techno-economic analysis was also conducted to determine the feasibility of the CLP at commercial scale. This report provides a detailed account of all the results obtained during the project period.

Nihar Phalak; Shwetha Ramkumar; Daniel Connell; Zhenchao Sun; Fu-Chen Yu; Niranjani Deshpande; Robert Statnick; Liang-Shih Fan

2011-07-31T23:59:59.000Z

27

Absolute pitch and related abilities  

E-Print Network (OSTI)

of musical processing in listeners with absolute pitch andrelative pitch. The National Academy of Sciences, 95, 3172-G. J. (2001). “Absolute pitch in infant auditory learning:

Dooley, Kevin David

2011-01-01T23:59:59.000Z

28

Additives and Cathode Materials for High-Energy Lithium Sulfur...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Additives and Cathode Materials for High-Energy Lithium Sulfur Batteries Additives and Cathode Materials for High-Energy Lithium Sulfur Batteries 2013 DOE Hydrogen and Fuel Cells...

29

Tall oil pitch  

Science Journals Connector (OSTI)

n....Undistilled residue from the distillation of crude tall oil. It is generally recognized that tall oil pitches contain some high-boiling esters and neutral...

2007-01-01T23:59:59.000Z

30

High coking value pitch  

SciTech Connect

A high coking value pitch prepared from coal tar distillate and has a low softening point and a high carbon value while containing substantially no quinoline insolubles is disclosed. The pitch can be used as an impregnant or binder for producing carbon and graphite articles.

Miller, Douglas J.; Chang, Ching-Feng; Lewis, Irwin C.; Lewis, Richard T.

2014-06-10T23:59:59.000Z

31

Pitch of a polymer cholesteric  

Science Journals Connector (OSTI)

Pitch of a polymer cholesteric ... We report measurements of the cholesteric pitch and twist elastic constant (K22) in monodisperse suspensions of the rodlike virus filamentous bacteriophage fd. ... Cholesteric Pitch of Lyotropic Polymer Liquid Crystals ...

Theo. Odijk

1987-01-01T23:59:59.000Z

32

ELEVATOR PITCH WORKSHEET Important Notes About Your Elevator Pitch  

E-Print Network (OSTI)

ELEVATOR PITCH WORKSHEET Important Notes About Your Elevator Pitch: � Just as you customize your resume and cover letter to individual companies, your elevator pitch can also be customized to highlight your most relevant skills and experience for a situation. � Your elevator pitch should have the ability

Barnes, Elizabeth A.

33

Chapter 11 - Sulfur Recovery  

Science Journals Connector (OSTI)

Abstract Sulfur is present in many raw industrial gases and in natural gas in the form of hydrogen sulfide. Sulfur removal facilities are located at the majority of oil and gas processing facilities throughout the world. The sulfur recovery unit does not make a profit for the operator but it is an essential processing step to allow the overall facility to operate, as the discharge of sulfur compounds to the atmosphere is severely restricted by environmental regulations. Concentration levels of H2S vary significantly depending upon their source. H2S produced from absorption processes, such as amine treating of natural gas or refinery gas, can contain 50–75% H2S by volume or higher. This chapter provides information about fundamentals of sulfur removal facilities in the natural gas industry.

Alireza Bahadori

2014-01-01T23:59:59.000Z

34

Propeller pitch change mechanism  

SciTech Connect

This patent describes an aircraft propulsion system. It comprises: a first turbine carrying a first set of propeller blades; a second turbine carrying a second set of propeller blades; a gear system carried by the first turbine for changing pitch of the first set of propeller blades, which includes a pair of ring gears, both coaxial with the first turbine; a first set of planet gears which engage both ring gears and which induce pitch change when the planet gears rotate; a sun gear which drives the planet gears; a second set of planet gears which are carried by a planet gear carrier affixed to the second turbine and which drive the sun gear in order to change pitch by causing relative motion between the sung ear and the first turbine; and means for preventing a change in speed of the planet gear carrier from causing a change in pitch.

Hora, P.

1992-10-13T23:59:59.000Z

35

Pitch control capacitance coupling  

SciTech Connect

A variable pitch propeller system is described having a stationary side and a rotating side, the rotating side including a plurality of variable pitch propeller blades, as characterized by: first means mounted upon the stationary side for sending control signals to set blade pitch and for receiving position signals relative to the blade pitch; second means mounted upon the rotating side for receiving the control signals and for sending the position signals; and a communications link for carrying the signals between the first and second means, the link having; a high side capacitor having a first plate mounted to the stationary side and electrically attaching to the first means; a low side capacitor having a first plate mounted to the stationary side and attaching electrically to the first means and a second plate mounted to the rotating side and electrically attaching to the second means such that the low side capacitor provides a differential, low potential return path for the control signals from the second means to the first means and the position signals from the first means to the second means.

Wyrostek, A.J.; Mayo, M.G.

1988-07-12T23:59:59.000Z

36

Pitch based foam with particulate  

DOE Patents (OSTI)

A thermally conductive, pitch based foam composite having a particulate content. The particulate alters the mechanical characteristics of the foam without severely degrading the foam thermal conductivity. The composite is formed by mixing the particulate with pitch prior to foaming.

Klett, James W. (Knoxville, TN)

2001-01-01T23:59:59.000Z

37

Single Organic Microtwist with Tunable Pitch  

Science Journals Connector (OSTI)

Single Organic Microtwist with Tunable Pitch ... Initially, some short twists with lengths of only several pitches are formed. ...

Hai-Bo Chen; Yan Zhou; Jie Yin; Jing Yan; Yuguo Ma; Lei Wang; Yong Cao; Jian Wang; Jian Pei

2009-04-17T23:59:59.000Z

38

CRADA Final Report For CRADA NO. CR-12-006 [Operation and Testing of an SO{sub 2}-depolarized Electrolyzer (SDE) for the Purpose of Hydrogen and Sulfuric Acid Production  

SciTech Connect

Over the past several years, Savannah River National Laboratory (SRNL) has led a team of collaborators under the Department of Energy’s (DOE) nuclear hydrogen production program to develop the Hybrid Sulfur (HyS) Process. HyS is a 2-step water-splitting process consisting of high temperature decomposition of sulfuric acid to generate SO{sub 2}, followed by the electrolysis of aqueous SO{sub 2} to generate hydrogen and sulfuric acid. The latter is fed back into the high temperature reactor. SRNL designed and built an SO{sub 2}-depolarized electrolyzer (SDE) and a test facility. Over 40 SDE’s were tested using different catalysts, membranes and other components. SRNL demonstrated that an SDE could be operated continuously for approximately 200 hours under certain conditions without buildup of sulfur at the SDE’s cathode, thus solving a key technical problem with SDE technology. Air Products and Chemicals, Inc. (APCI) is a major supplier of hydrogen production systems, and they have proprietary technology that could benefit from the SDE developed by SRNS, or some improved version thereof. However, to demonstrate that SRNL’s SDE is a truly viable approach to the electrolyzer design, continuous operation for far greater periods of time than 200 hours must be demonstrated, and the electrolyzer must be scaled up to greater hydrogen production capacities. SRNL and Air Products entered into a Cooperative Research and Development Agreement with the objective of demonstrating the effectiveness of the SDE for hydrogen and sulfuric acid production and to demonstrate long-term continuous operation so as to dramatically increase the confidence in the SDE design for commercial operation. SRNL prepared a detailed technical report documenting previous SDE development, including the current SDE design and operating conditions that led to the 200-hour sulfurfree testing. SRNL refurbished its single cell SDE test facility and qualified the equipment for continuous operation. A new membrane electrode assembly (MEA) was fabricated and installed in the single cell electrolyzer (60 cm{sup 2} active cell area). Shakedown testing was conducted, and several modifications were made to the test facility equipment. Seven different MEAs were used during testing. Beginning on May 20, 2013, SRNL was able to test the SDE continuously for 1200 hours, including 1000 hours under power to generate hydrogen at an average rate of 10.8 liters per hour. The SDE was not removed or repaired during the 50-day test and was successfully restarted after each shutdown. The test was intentionally stopped after 1200 hours (1000 hours of hydrogen production) due to funding constraints. Post-test examination of the MEA using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Microanalysis (EDAX) showed no elemental sulfur deposits or sulfur layer inside the cell, thus successfully achieving the test goals. The results demonstrated that the SDE could be operated for extended periods without major performance degradation or the buildup of sulfur inside the MEA. Air Products conducted an assessment of the economic viability of the SDE based on the “as tested” design. The results indicated that the SDE faces significant economic obstacles in its current state. Further development and scale-up are necessary before the SDE is ready for commercialization.

Summers, W. A.; Colon-Mercado, H. R.; Steimke, J. L.; Zahn, Steffen

2014-02-24T23:59:59.000Z

39

Hydrogen  

Science Journals Connector (OSTI)

Hydrogen energy is a clean or inexhaustible energy like renewable energy and nuclear energy. Today’s energy supply has a considerable impact on the environment. Hydrogen energy is a promising alternative solut...

2009-01-01T23:59:59.000Z

40

Industrial Heating with Creosote Pitch  

Science Journals Connector (OSTI)

Industrial Heating with Creosote Pitch ... TO REDUCE the demand for imported petroleum fuel oil, some British plants are using a mixture of creosote and pitch, obtained during the manufacture of city gas. ... Thus these tar oils, the most commonly used being creosote pitch, must be maintained at a temperature of not less than 90° F. at all times and delivered warm into suitably heated tanks. ...

C. H. S. TUPHOLME

1942-05-10T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Method of producing synthetic pitch  

DOE Patents (OSTI)

Embodiments of a method are described for modifying pitches, oils, tars, and binders by using these materials as solvents to extract organic chemicals from coal.

Kennel, Elliot B. (Morgantown, WV); Stansberry, Peter G. (North Olmsted, OH); Stiller, Alfred H. (Morgantown, WV); Zondlo, John W. (Albright, WV)

2012-07-24T23:59:59.000Z

42

The Effect of Pitch Composition on the Adsorption Behavior of Pd-Doped ACF  

SciTech Connect

Recent studies indicate that metal-containing activated carbon fibers (ACF) are promising adsorbents for hydrogen storage applications. In these studies, Pd compounds were added to a petroleum precursor and formed into ACFs. Results showed that the molecular composition of the pitch had a significant affect on critical characteristics of the ACFs, such as pore size and Pd particle size. In an ongoing Department of Energy project, we are testing pitch precursors with carefully controlled chemical compositions in order to develop an optimum precursor for hydrogen storage applications. A low softening point pitch made by Marathon Oil is being separated into narrow molecular weight fractions using a dense gas extraction (DGE) process. In the current series of tests the heavier portion of the extracted pitch was used to prepare both undoped and Pd-doped carbon fibers. These fibers were activated over a range of temperatures to determine the effect of temperature and pitch composition on ACF properties. Lower activation temperatures resulted in increased microporosity (desirable for hydrogen adsorption) for all Pd-doped pitch precursors. Comparing ACFs produced from various DGE-extracted pitches showed that even small quantities of mesophase-forming components inhibited activation and significantly reduced microporosity. Additional DGE pitch fractions are now being tested to further refine the optimum composition for hydrogen storage applications.

Tekinalp, Halil [Clemson University; Cervo, Eduardo [Clemson University; Thies, Mark C [ORNL; Contescu, Cristian I [ORNL; Gallego, Nidia C [ORNL; Edie, Dan [Clemson University

2007-01-01T23:59:59.000Z

43

1 Pitch, Frequency, Musical Scales 1 1.1 Pitch and Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  

E-Print Network (OSTI)

Contents ix 1 Pitch, Frequency, Musical Scales 1 1.1 Pitch and Frequency.2 Overtones, Pitch Equivalence, and Musical Scales . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2.1 Pitch Equivalence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1

Walker, James S.

44

PRODUCTION OF FOAMS, FIBERS AND PITCHES USING A COAL EXTRACTION PROCESS  

SciTech Connect

This Department of Energy National Energy Technology Laboratory sponsored project developed processes for converting coal feedstocks to carbon products, including coal-derived pitch, coke foams and fibers based on solvent extraction processes. A key technology is the use of hydrogenation accomplished at elevated temperatures and pressures to obtain a synthetic coal pitch. Hydrogenation, or partial direct liquefaction of coal, is used to modify the properties of raw coal such that a molten synthetic pitch can be obtained. The amount of hydrogen required to produce a synthetic pitch is about an order of magnitude less than the amount required to produce synthetic crude oil. Hence the conditions for synthetic pitch production consume very little hydrogen and can be accomplished at substantially lower pressure. In the molten state, hot filtration or centrifugation can be used to separate dissolved coal chemicals from mineral matter and insolubles (inertinite), resulting in the production of a purified hydrocarbon pitch. Alternatively, if hydrogenation is not used, aromatic hydrocarbon liquids appropriate for use as precursors to carbon products can obtained by dissolving coal in a solvent. As in the case for partial direct liquefaction pitches, undissolved coal is removed via hot filtration or centrifugation. Excess solvent is boiled off and recovered. The resultant solid material, referred to as Solvent Extracted Carbon Ore or SECO, has been used successfully to produce artificial graphite and carbon foam.

Chong Chen; Elliot B. Kennel; Liviu Magean; Pete G. Stansberry; Alfred H. Stiller; John W. Zondlo

2004-06-20T23:59:59.000Z

45

Propeller pitch change actuation system  

SciTech Connect

An apparatus is described for adjusting the pitch of a variable pitch propeller blade characterized by: an actuator for setting the pitch of the propeller blade the actuator having; a rotatable screw for setting propeller pitch, a nut mounted for longitudinal motion along the screw as the screw is rotated, means for connecting the nut to the propeller blade to adjust the pitch of the propeller blade as the screw rotates, and a rotatable means mounted within the nut for locking the nut against longitudinal motion if the rotatable means is not rotating with the longitudinal motion of the nut and for allowing the nut to move longitudinally if the rotatable means is rotating with the longitudinal motion of the nut.

Kusiak, E.H.

1988-06-28T23:59:59.000Z

46

Pitch discrimination of patterned electric stimulation  

E-Print Network (OSTI)

1, July 2005 Chen et al. : Pitch discrimination of patternedWouters, J. ?2002?. “Temporal pitch mechanisms in acousticI. The place code for pitch,” Hear. Res. 111, Chen, H. and

Chen, H B; Ishihara, Y C; Zeng, F G

2005-01-01T23:59:59.000Z

47

Real time vibraphone pitch and timbre classification :  

E-Print Network (OSTI)

A Pitch Tracking . . . . . . B Percussion Classi?cation CDIEGO Real Time Vibraphone Pitch and Timbre Classi?cation ABrown, G. J. , 2003: A multi-pitch tracking algorithm for

Larke, Kevin

2008-01-01T23:59:59.000Z

48

SULFUR-TOLERANT CATALYST FOR THE SOLID OXIDE FUEL CELL.  

E-Print Network (OSTI)

??JP-8 fuel is easily accessible, transportable, and has hydrogen content essential to solid oxide fuel cell (SOFC) operation. However, this syngas has sulfur content which… (more)

Bozeman, Joe Frank, III

2010-01-01T23:59:59.000Z

49

Pitch for Solar Instructions | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Pitch for Solar Instructions Pitch for Solar Instructions SunShot invites visionaries, entrepreneurs, and innovators to share their big ideas to propose solutions that will enable...

50

Why Sequence Sulfur-Oxidizing Bacteria?  

NLE Websites -- All DOE Office Websites (Extended Search)

Sulfur-Oxidizing Bacteria? Sulfur-Oxidizing Bacteria? Several environmental problems, such as acid rain, biocorrosion, etc., are caused by sulfur compounds, such as sulfur dioxide (SO2) and hydrogen sulfide (H2S). A sustainable process to remove these sulfur compounds is the production of elemental sulfur from H2S-containing gas streams by the use of sulfide-oxidizing bacteria. In this process, H2S is absorbed into the alkaline solution in the scrubber unit, followed by the biological oxidation of H2S to elemental sulfur and the recycling of water. With this two-step process, a variety of gas streams (i.e., natural gas, synthesis gas, biogas, and refinery gas) can be treated. For the treatment of sulfate-containing waste streams, an extra step has to be introduced: the transformation of sulfate into H2S by sulfate-reducing bacteria. In

51

Written vs. Sounding Pitch Donald Byrd  

E-Print Network (OSTI)

1 Written vs. Sounding Pitch Donald Byrd School of Informatics and School of Music Indiana that converting written pitch to sounding pitch in conventional Western music notation is simply a matter of transposition and always straightforward. In fact, there are many situations in which converting written pitch

Indiana University

52

Preparation of titania nanotube-Cd0.65Zn0.35S nanocomposite by a hydrothermal sulfuration method for efficient visible-light-driven photocatalytic hydrogen production  

Science Journals Connector (OSTI)

Abstract Titania nanotube-Cd0.65Zn0.35S nanocomposite (Cd0.65Zn0.35S-TiO2) was synthesized from titanate nanotubes for ion change of Cd2+ and Zn2+ followed by hydrothermal sulfuration treatment using thiourea as sulfur source. The Cd0.65Zn0.35S-TiO2 with enhanced crystallinity of TiO2 nanotube can be obtained by increasing hydrothermal temperature from 90 °C to 120 °C. And further increasing hydrothermal temperature to 150 °C, TiO2 nanotubes collapse and transform into irregular shaped particles. The photocatalytic activity for hydrogen production of the prepared Cd0.65Zn0.35S-TiO2 with different hydrothermal temperature was investigated under visible-light irradiation. The result shows that the Cd0.65Zn0.35S-TiO2 with hydrothermal temperature of 120 °C presents the highest hydrogen evolution rate and photostability, which can be attributed to a rapid charge transfer at the interface between Cd0.65Zn0.35S and TiO2 nanotube due to the increased crystallinity and unique 1-D nanotubular structure of TiO2.

Juan Li; Liangpeng Wu; Lizhen Long; Min Xi; Xinjun Li

2014-01-01T23:59:59.000Z

53

CATALYST EVALUATION FOR A SULFUR DIOXIDE-DEPOLARIZED ELECTROLYZER  

SciTech Connect

Thermochemical processes are being developed to provide global-scale quantities of hydrogen. A variant on sulfur-based thermochemical cycles is the Hybrid Sulfur (HyS) Process which uses a sulfur dioxide depolarized electrolyzer (SDE) to produce the hydrogen. Testing examined the activity and stability of platinum and palladium as the electrocatalyst for the SDE in sulfuric acid solutions. Cyclic and linear sweep voltammetry revealed that platinum provided better catalytic activity with much lower potentials and higher currents than palladium. Testing also showed that the catalyst activity is strongly influenced by the concentration of the sulfuric acid electrolyte.

Hobbs, D; Hector Colon-Mercado, H

2007-01-31T23:59:59.000Z

54

Method to prevent sulfur accumulation in membrane electrode assembly  

DOE Patents (OSTI)

A method of operating a hybrid sulfur electrolyzer to generate hydrogen is provided that includes the steps of providing an anolyte with a concentration of sulfur dioxide, and applying a current. During steady state generation of hydrogen a plot of applied current density versus concentration of sulfur dioxide is below a boundary line. The boundary line may be linear and extend through the origin of the graph with a slope of 0.001 in which the current density is measured in mA/cm2 and the concentration of sulfur dioxide is measured in moles of sulfur dioxide per liter of anolyte.

Steimke, John L; Steeper, Timothy J; Herman, David T

2014-04-29T23:59:59.000Z

55

Sulfide catalysts for reducing SO2 to elemental sulfur  

DOE Patents (OSTI)

A highly efficient sulfide catalyst for reducing sulfur dioxide to elemental sulfur, which maximizes the selectivity of elemental sulfur over byproducts and has a high conversion efficiency. Various feed stream contaminants, such as water vapor are well tolerated. Additionally, hydrogen, carbon monoxide, or hydrogen sulfides can be employed as the reducing gases while maintaining high conversion efficiency. This allows a much wider range of uses and higher level of feed stream contaminants than prior art catalysts.

Jin, Yun (Peking, CN); Yu, Qiquan (Peking, CN); Chang, Shih-Ger (El Cerrito, CA)

2001-01-01T23:59:59.000Z

56

Abnormal Pitch Perception Produced by Cochlear Implant Stimulation  

E-Print Network (OSTI)

1997) Comparison of electrode discrimination, pitch ranking,and pitch scaling data in postlingually deafened adult1951) A Duplex Theory of Pitch Perception. Experientia 7:

Zeng, Fan-Gang; Tang, Qing; Lu, Thomas; Bensmaia, Sliman J

2014-01-01T23:59:59.000Z

57

Method of casting pitch based foam  

DOE Patents (OSTI)

A process for producing molded pitch based foam is disclosed which minimizes cracking. The process includes forming a viscous pitch foam in a container, and then transferring the viscous pitch foam from the container into a mold. The viscous pitch foam in the mold is hardened to provide a carbon foam having a relatively uniform distribution of pore sizes and a highly aligned graphic structure in the struts.

Klett, James W. (Knoxville, TN)

2002-01-01T23:59:59.000Z

58

Coke–pitch interactions during anode preparation  

Science Journals Connector (OSTI)

Abstract The information on the interactions between coke and pitch is of great value for the aluminum industry. This information can help choose the suitable coke and pitch pairs as well as the appropriate mixing parameters to be used during the production of anodes. In this study, the interaction mechanisms of pitch and coke at the mixing stage were studied by a sessile-drop test using two coal-tar pitches as the liquid and three petroleum cokes as the substrate. The results showed that the coke–pitch interactions are related to both pitch and coke chemical compositions. The contact angle of different coke–pitch systems decreased with increasing time and temperature. At high temperatures, decreasing the pitch viscosity facilitated the spreading of pitch and its penetration into the coke bed. The chemical behavior of petroleum cokes and coal tar pitches were studied using the FT-IR spectroscopy and XPS. The results showed that the wettability behavior of cokes by pitches depends on their physical properties as well as the presence of surface functional groups of coke and pitch which can form chemical bonds.

Arunima Sarkar; Duygu Kocaefe; Yasar Kocaefe; Dilip Sarkar; Dipankar Bhattacharyay; Brigitte Morais; Jérôme Chabot

2014-01-01T23:59:59.000Z

59

Absolute pitch: perception, coding, and controversies  

E-Print Network (OSTI)

Absolute pitch: perception, coding, and controversies Daniel J. Levitin and Susan E. Rogers are converging to shed light on the nature of processing, categorization and memory for pitch in humans and animals. Although most people are unable to name or place pitch values in consistent, well

Levitin, Daniel

60

Abnormal Electrical Brain Responses to Pitch in  

E-Print Network (OSTI)

Abnormal Electrical Brain Responses to Pitch in Congenital Amusia Isabelle Peretz, PhD,1 Elvira- sults suggest that this disorder is critically dependent on fine-grained pitch discrimination. Here, we2-P3 response elicited by pitch changes. This abnormal brain response begins as early as 200

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

The Relationship Between Pitch and Persuasiveness  

E-Print Network (OSTI)

1 1 The Relationship Between Pitch and Persuasiveness Honors thesis Rebecca Warner Spring 2005 2 It of speech Vocal channelVocal channel speech minus content #12;4 7 Vocal channel · Rate · Loudness · Pitch Appraisal Decision-making & 8 Pitch How high or low someone talks Fundamental frequency (F�) · Physical

Champagne, Frances A.

62

Cholesteric Pitch of Lyotropic Polymer Liquid Crystals  

Science Journals Connector (OSTI)

Cholesteric Pitch of Lyotropic Polymer Liquid Crystals ... The cholesteric pitch P of semiflexible helical polymer solutions was formulated using a threaded equivalent freely jointed chain model. ... The structure of cholesteric liquid crystals is characterized by the cholesteric pitch P or the cholesteric wavenumber qc (?2?/P). ...

Takahiro Sato; Jun Nakamura; Akio Teramoto; Mark M. Green

1998-02-03T23:59:59.000Z

63

Is Intrinsic Pitch language-dependent? Evidences from a cross-linguistic vowel pitch experiment (with  

E-Print Network (OSTI)

Is Intrinsic Pitch language-dependent? Evidences from a cross-linguistic vowel pitch experiment 1 ZAS, 2 IPDS 1 Berlin and 2 Kiel, Germany pape@zas.gwz-berlin.de Abstract Intrinsic Pitch differences (perceived pitch differences between high vs. low vowels) were found for Germanic languages. Our

64

The reaction kinetics of gasoline sulfur compounds: Catalytic mechanisms for sulfur reduction  

SciTech Connect

One of the key elements of reformulated gasoline is the reduction of the sulfur compounds produced by fluid catalytic cracking. This paper probes the reaction kinetics of refractory gasoline-range thiophene derivatives (thiophene, tetrahydrothiophene, and alkylthiophenes) in an effort to determine the mechanisms of sulfur compound cracking in the FCC unit. The gasoline-range sulfur compounds were analyzed using gas chromatography with an atomic emission detector. The authors` results show that the FCC catalysts affects the cracking of sulfur compounds through both hydrogen transfer and zeolite pore restriction mechanisms. An experimental FCC catalyst is shown to reduce gasoline sulfur content in the Davidson Circulating Riser (DCR{sup TM}) pilot unit. Model compound tests show that the activity of the catalyst is due to both its catalytic and adsorptive properties. Tetrahydrothiophene, which is produced from thiophenes by hydrogen transfer, is completely removed by the experimental catalyst.

Harding, R.H.; Gatte, R.R.; Albro, T.G.; Wormsbecher, R.F. [W.R. Grace & Co. Conn, Columbia, MD (United States)

1993-12-31T23:59:59.000Z

65

Carbon fibers from SRC pitch  

DOE Patents (OSTI)

This invention relates to an improved method of manufacturing carbon fibers from a coal derived pitch. The improvement resides in the use of a solvent refined coal which has been hydrotreated and subjected to solvent extraction whereby the hetero atom content in the resulting product is less than 4.0% by weight and the softening point is between about 100.degree.-250.degree. F.

Greskovich, Eugene J. (Allentown, PA); Givens, Edwin N. (Bethlehem, PA)

1981-01-01T23:59:59.000Z

66

PITCH BASED SOUND CLASSIFICATION Andreas B. Nielsen, Lars K. Hansen  

E-Print Network (OSTI)

PITCH BASED SOUND CLASSIFICATION Andreas B. Nielsen, Lars K. Hansen Intelligent Signal Processing the pitch of the signal using the harmonic product spectrum. Based on the pitch estimate and a pitch error. The pitch is an interesting feature of sound and is used in various situations. One of the reasons pitch

67

Steam reforming utilizing sulfur tolerant catalyst  

SciTech Connect

This patent describes a steam reforming process for converting hydrocarbon material to hydrogen gas in the presence of sulfur which consists of: adding steam to the hydrocarbon material and passing the steam and hydrocarbon material over catalyst material at elevated temperatures. The improvement comprises utilizing as a catalyst material high activity, sulfur tolerant catalyst of platinum supported on lanthanum stabilized alumina or magnesium promoted lanthanum stabilized alumina. It also describes a steam process for converting hydrocarbon material to hydrogen gas in the presence of sulfur which consists of steam to the hydrocarbon material over catalyst material at elevated temperatures. The improvement comprises utilizing as a catalyst material high activity, sulfur tolerant catalysts consisting essentially of iridium supported on lanthanum stabilized alumina or magnesium promoted lanthanum stabilized alumina. In addition a steam reforming process is described for converting hydrocarbon material to hydrogen gas in the presence of sulfur comprising adding steam to the hydrocarbon material and passing the steam and hydrocarbon material over catalyst material at elevated temperatures. The improvement comprises utilizing as a catalyst material high activity sulfur tolerant catalysts consisting essentially of palladium supported on lanthanum stabilized alumina or magnesium promoted lanthanum stabilized alumina.

Setzer, H.J.; Karavolis, S.; Bett, J.A.S.

1987-09-15T23:59:59.000Z

68

Sulfur tolerant molten carbonate fuel cell anode and process  

DOE Patents (OSTI)

Molten carbonate fuel cell anodes incorporating a sulfur tolerant carbon monoxide to hydrogen water-gas-shift catalyst provide in situ conversion of carbon monoxide to hydrogen for improved fuel cell operation using fuel gas mixtures of over about 10 volume percent carbon monoxide and up to about 10 ppm hydrogen sulfide.

Remick, Robert J. (Naperville, IL)

1990-01-01T23:59:59.000Z

69

RNA-Seq Analysis of Sulfur-Deprived Chlamydomonas Cells Reveals Aspects of Acclimation Critical for Cell Survival  

Science Journals Connector (OSTI)

...Z. (2007). The role of hydrogen peroxide in regulation of plant...A.R. (2001). Sulfur economy and cell wall biosynthesis...hypersensitive cell death by hydrogen peroxide produced through polyamine...2002). Probing green algal hydrogen production. Philos. Trans...

David González-Ballester; David Casero; Shawn Cokus; Matteo Pellegrini; Sabeeha S. Merchant; Arthur R. Grossman

2010-06-29T23:59:59.000Z

70

Immersion diffractometry for determining nanoscale grating pitch  

Science Journals Connector (OSTI)

The laser diffractometer is an effective instrument for calibrating pitch standard of a grating structure. A conventional diffractometer based on the Littrow configuration cannot...

Lu, Sheng-Hua; Tseng, Li-Cheng; Kao, Ching-Fen; Pan, Shang-Peng; Chang, Liang-Chih

2006-01-01T23:59:59.000Z

71

Pitch Angle of Galactic Spiral Arms  

E-Print Network (OSTI)

One of the key parameters that characterize spiral arms in disk galaxies is a pitch angle that measures the inclination of a spiral arm to the direction of galactic rotation. The pitch angle differs from galaxy to galaxy, which suggests that the rotation law of galactic disks determines it. In order to investigate the relation between the pitch angle of spiral arms and the shear rate of galactic differential rotation, we perform local $N$-body simulations of pure stellar disks. We find that the pitch angle increases with the epicycle frequency and decreases with the shear rate and obtain the fitting formula. This dependence is explained by the swing amplification mechanism.

Michikoshi, Shugo

2014-01-01T23:59:59.000Z

72

Reading with fixed and variable character pitch  

Science Journals Connector (OSTI)

We compared the effects of fixed and variable (proportional) spacing on reading speeds and found variable pitch to yield better performance at medium and large character sizes and...

Arditi, Aries; Knoblauch, Kenneth; Grunwald, Ilana

1990-01-01T23:59:59.000Z

73

The effect of body temperature on the determination of pitch by an absolute pitch possessor  

Science Journals Connector (OSTI)

Few people have absolute pitch (AP); that is, they can identify a pitch that they are hearing without any reference...R 2...= 0.7, or higher) with a temperature coefficient of about ?3 Hz/K near 4...

Masaya Iwamoto; Kouki Doi; Tatsuo Togawa

2007-01-01T23:59:59.000Z

74

Cortical pitch response components index stimulus onset/offset and dynamic features of pitch contours  

Science Journals Connector (OSTI)

Abstract Voice pitch is an important information-bearing component of language that is subject to experience dependent plasticity at both early cortical and subcortical stages of processing. We have already demonstrated that pitch onset component (Na) of the cortical pitch response (CPR) is sensitive to flat pitch and its salience. In regards to dynamic pitch, we do not yet know whether the multiple pitch-related transient components of the CPR reflect specific temporal attributes of such stimuli. Here we examine the sensitivity of the multiple transient components of CPR to changes in pitch acceleration associated with the Mandarin high rising lexical tone. CPR responses from Chinese listeners were elicited by three citation forms varying in pitch acceleration and duration. Results showed that the pitch onset component (Na) was invariant to changes in acceleration. In contrast, Na–Pb and Pb–Nb showed a systematic increase in the interpeak latency and decrease in amplitude with increase in pitch acceleration that followed the time course of pitch change across the three stimuli. A strong correlation with pitch acceleration was observed for these two components only – a putative index of pitch-relevant neural activity associated with the more rapidly-changing portions of the pitch contour. Pc–Nc marks unambiguously the stimulus offset. We therefore propose that in the early stages of cortical sensory processing, a series of neural markers flag different temporal attributes of a dynamic pitch contour: onset of temporal regularity (Na); changes in temporal regularity between onset and offset (Na–Pb, Pb–Nb); and offset of temporal regularity (Pc–Nc). At the temporal electrode sites, the stimulus with the most gradual change in pitch acceleration evoked a rightward asymmetry. Yet within the left hemisphere, stimuli with more gradual change were indistinguishable. These findings highlight the emergence of early hemispheric preferences and their functional roles as related to sensory and cognitive properties of the stimulus.

Ananthanarayan Krishnan; Jackson T. Gandour; Saradha Ananthakrishnan; Venkatakrishnan Vijayaraghavan

2014-01-01T23:59:59.000Z

75

Safety considerations for the use of sulfur in sulfur-modified pavement materials  

E-Print Network (OSTI)

on the surround1ng environment. As sulfur-modified paving materials were being developed, there was a corresponding concern for studying the amounts of gaseous emiss1ons that were generated. The Texas Trans- portat1on Inst1tute (TTI) was one of the first... organizations in the United States to become 1nvolved in the research and development of sulfur-modified pavements, Throughout 1ts laboratory stud1es TTI cont1nually mon1tored hydrogen sulf1de (H25) and sulfur d1oxide (502) em1ssions produced during mix...

Jacobs, Carolyn Yuriko

2012-06-07T23:59:59.000Z

76

Development of the Hybrid Sulfur Thermochemical Cycle  

SciTech Connect

The production of hydrogen via the thermochemical splitting of water is being considered as a primary means for utilizing the heat from advanced nuclear reactors to provide fuel for a hydrogen economy. The Hybrid Sulfur (HyS) Process is one of the baseline candidates identified by the U.S. Department of Energy [1] for this purpose. The HyS Process is a two-step hybrid thermochemical cycle that only involves sulfur, oxygen and hydrogen compounds. Recent work has resulted in an improved process design with a calculated overall thermal efficiency (nuclear heat to hydrogen, higher heating value basis) approaching 50%. Economic analyses indicate that a nuclear hydrogen plant employing the HyS Process in conjunction with an advanced gas-cooled nuclear reactor system can produce hydrogen at competitive prices. Experimental work has begun on the sulfur dioxide depolarized electrolyzer, the major developmental component in the cycle. Proof-of-concept tests have established proton-exchange-membrane cells (a state-of-the-art technology) as a viable approach for conducting this reaction. This is expected to lead to more efficient and economical cell designs than were previously available. Considerable development and scale-up issues remain to be resolved, but the development of a viable commercial-scale HyS Process should be feasible in time to meet the commercialization schedule for Generation IV gas-cooled nuclear reactors.

Summers, William A.; Steimke, John L

2005-09-23T23:59:59.000Z

77

Sulfur Impregnation on Activated Carbon Fibers through H2S Oxidation for Vapor Phase  

E-Print Network (OSTI)

Sulfur Impregnation on Activated Carbon Fibers through H2S Oxidation for Vapor Phase Mercury: Sulfur was impregnated onto activated carbon fibers ACFs through H2S oxidation catalyzed by the sorbent CE Database subject headings: Activated carbon; Sulfur; Mercury; Hydrogen sulfides; Oxidation

Borguet, Eric

78

New pole tip shapes mitigating torque ripple in short pitched and fully pitched switched reluctance motors  

Science Journals Connector (OSTI)

High torque ripple is one of the major disadvantages of switched reluctance motor (SRM). Although there are several publications in the literature addressing the full or partial solution to the problem for conventional SRM, no publication exists for the torque ripple reduction of recently emerging fully pitched SRM. This paper deals with finding best dimension set for a particular stator and rotor pole tip shape aiming to reduce torque ripple in both short pitched and fully pitched SRMs. Five new stator and rotor pole tip structures have been investigated and compared with conventional pole tip. Analyses have been performed with the finite element (FE) models of 6/43-phase short pitched and fully pitched SRM with unipolar excitation. With the proposed pole tips, torque ripple is reduced by 24.1% in short pitched SRM for 10 A phase current and by 22.6% in fully pitched SRM for 5.59 A phase current.

Yusuf Ozoglu; Muhammet Garip; Erkan Mese

2005-01-01T23:59:59.000Z

79

Coking properties of coal pitch in coal batch  

Science Journals Connector (OSTI)

The coking properties of coal pitch depend significantly on its fractional composition, ... : 2: 2. This is typical of coal pitch with a softening temperature of 75– ... Such pitch is the best clinkering additive...

S. G. Gagarin; Yu. I. Neshin

2011-09-01T23:59:59.000Z

80

Pushing EUV lithography development beyond 22-nm half pitch  

E-Print Network (OSTI)

development beyond 22-nm half pitch Patrick P. Naulleau, 10.3-NA MET for sub-22-nm half-pitch development. We considerof 0.57. The orientation and pitch dependence of the imaging

Naulleau, Patrick

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Acuity of auditory images in pitch and time  

E-Print Network (OSTI)

auditory mem- ory for tone pitch be rehearsed? Journal offoundations of musical pitch. New York: Oxford UniversityAiming at- tention in pitch and time in the perception of

Janata, Petr; Paroo, Kaivon

2006-01-01T23:59:59.000Z

82

Offshore Sulfur Comes In  

Science Journals Connector (OSTI)

Offshore Sulfur Comes In ... "The deposit is a major new source of sulfur," say Hines H. Baker, president of Humble Oil, and Langbourne M. Williams, president of Freeport Sulphur. ... Humble's deposit, known as Grand Isle (Block 18), was discovered in the course of offshore oil exploration and it ranks among the most important sulfur discoveries of recent years. ...

1956-10-01T23:59:59.000Z

83

Sulfur-Free Selective Pulping  

E-Print Network (OSTI)

Technoeconomic Appraisal," December 1991. 5. DOE Annual Report on Contract No. AC02-83CH10093, Bozell, J. J., Hames, B., Chum, H. L., Dimmel, D. R, Althen, E., Caldwell, P. L., Daube, Oxidation ;; Diels-Alder .. I I -Methanol .. ~ 5 I 3 (C~O) OCH... - Hydrogen 3 (Q-IP) # Q-I 3 o o ~ o 1 2 ~ (H) Lignin DMBQ =two OCH3 groups Anthraquinone MMBQ =one OCH3 group A. K, and Kuroda, K-I.,"Sulfur-free Selective Pulping," March 1992. 6. DOE Annual Report on Contrac No. DE-AC02-83CH10093, Bozell, J. J...

Dimmel, D. R.; Bozell, J. J.

84

Secretary Moniz Warms Up For Earth Day Pitch | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Warms Up For Earth Day Pitch Secretary Moniz Warms Up For Earth Day Pitch Addthis Speakers Secretary Ernest Moniz Duration :32...

85

Pitch-variable blazed grating consisting of freestanding silicon beams  

Science Journals Connector (OSTI)

Theoretical analysis is presented for a pitch-variable blazed grating which consists of freestanding silicon beams. The pitch-variable blazed grating is implemented by combining...

Wang, Yongjin; Kanamori, Yoshiaki; Hane, Kazuhiro

2009-01-01T23:59:59.000Z

86

Upgrading of Pitch Produced by Mild Gasification of Subbituminous Cal  

Science Journals Connector (OSTI)

Upgrading of Pitch Produced by Mild Gasification of Subbituminous Cal ... Structural Characterization of Coal Tar Pitches Obtained by Heat Treatment under Different Conditions ...

Robert L. McCormick; Mahesh C. Jha

1994-03-01T23:59:59.000Z

87

Development of carbon-carbon composites from solvent extracted pitch  

SciTech Connect

There are several methods used to fabricate carbon-carbon composites. One used extensively in the fabrication of aerospace components such as rocket nozzles and reentry vehicle nosetips, as well as commercial components for furnace fixturing and glass manufacturing, is the densification of a woven preform with molten pitch, and the subsequent conversion of the pitch to graphite through heat treatment. Two types of pitch are used in this process; coal tar pitch and petroleum pitch. The objective of this program was to determine if a pitch produced by the direct extraction of coal could be used as a substitute for these pitches in the fabrication of carbon-carbon composites. The program involved comparing solvent extracted pitch with currently accepted pitches and rigidizing a carbon-carbon preform with solvent extracted pitch for comparison with carbon-carbon fabricated with currently available pitch.

NONE

1996-06-24T23:59:59.000Z

88

Method for extruding pitch based foam  

DOE Patents (OSTI)

A method and apparatus for extruding pitch based foam is disclosed. The method includes the steps of: forming a viscous pitch foam; passing the precursor through an extrusion tube; and subjecting the precursor in said extrusion tube to a temperature gradient which varies along the length of the extrusion tube to form an extruded carbon foam. The apparatus includes an extrusion tube having a passageway communicatively connected to a chamber in which a viscous pitch foam formed in the chamber paring through the extrusion tube, and a heating mechanism in thermal communication with the tube for heating the viscous pitch foam along the length of the tube in accordance with a predetermined temperature gradient.

Klett, James W. (Knoxville, TN)

2002-01-01T23:59:59.000Z

89

UNDERSTANDING OF CATALYST DEACTIVATION CAUSED BY SULFUR POISONING AND CARBON DEPOSITION IN STEAM REFORMING OF LIQUID HYDROCARBON FUELS.  

E-Print Network (OSTI)

??The present work was conducted to develop a better understanding on the catalyst deactivation in steam reforming of sulfur-containing liquid hydrocarbon fuels for hydrogen production.… (more)

Xie, Chao

2011-01-01T23:59:59.000Z

90

Coupled roll-pitch motion: 1 : 2 resonance simulations  

E-Print Network (OSTI)

Coupled roll-pitch motion: 1 : 2 resonance simulations by H. Alemi Ardakani & T. J. Bridges This report shows the results of the coupled resonant roll-pitch simulation when the ratio of the first two roll-pitch motion Pitch and roll motions are taken to be harmonic and of the form (t) = p sin (pt

Bridges, Tom

91

METHOD TO PREVENT SULFUR ACCUMULATION INSIDE MEMBRANE ELECTRODE ASSEMBLY  

SciTech Connect

HyS is conceptually the simplest of the thermochemical cycles and involves only sulfur chemistry. In the HyS Cycle hydrogen gas (H{sub 2}) is produced at the cathode of the electrochemical cell (or electrolyzer). Sulfur dioxide (SO{sub 2}) is oxidized at the anode to form sulfuric acid (H{sub 2}SO{sub 4}) and protons (H{sup +}) as illustrated below. A separate high temperature reaction decomposes the sulfuric acid to water and sulfur dioxide which are recycled to the electrolyzers, and oxygen which is separated out as a secondary product. The electrolyzer includes a membrane that will allow hydrogen ions to pass through but block the flow of hydrogen gas. The membrane is also intended to prevent other chemical species from migrating between electrodes and undergoing undesired reactions that could poison the cathode or reduce overall process efficiency. In conventional water electrolysis, water is oxidized at the anode to produce protons and oxygen. The standard cell potential for conventional water electrolysis is 1.23 volts at 25 C. However, commercial electrolyzers typically require higher voltages ranging from 1.8 V to 2.6 V [Kirk-Othmer, 1991]. The oxidation of sulfur dioxide instead of water in the HyS electrolyzer occurs at a much lower potential. For example, the standard cell potential for sulfur dioxide oxidation at 25 C in 50 wt % sulfuric acid is 0.29 V [Westinghouse, 1980]. Since power consumption by the electrolyzers is equal to voltage times current, and current is proportional to hydrogen production, a large reduction in voltage results in a large reduction in electrical power cost per unit of hydrogen generated.

Steimke, J.; Steeper, T.; Herman, D.; Colon-Mercado, H.; Elvington, M.

2009-06-22T23:59:59.000Z

92

ADVANCED SULFUR CONTROL CONCEPTS  

SciTech Connect

Conventional sulfur removal in integrated gasification combined cycle (IGCC) power plants involves numerous steps: COS (carbonyl sulfide) hydrolysis, amine scrubbing/regeneration, Claus process, and tail-gas treatment. Advanced sulfur removal in IGCC systems involves typically the use of zinc oxide-based sorbents. The sulfides sorbent is regenerated using dilute air to produce a dilute SO{sub 2} (sulfur dioxide) tail gas. Under previous contracts the highly effective first generation Direct Sulfur Recovery Process (DSRP) for catalytic reduction of this SO{sub 2} tail gas to elemental sulfur was developed. This process is currently undergoing field-testing. In this project, advanced concepts were evaluated to reduce the number of unit operations in sulfur removal and recovery. Substantial effort was directed towards developing sorbents that could be directly regenerated to elemental sulfur in an Advanced Hot Gas Process (AHGP). Development of this process has been described in detail in Appendices A-F. RTI began the development of the Single-step Sulfur Recovery Process (SSRP) to eliminate the use of sorbents and multiple reactors in sulfur removal and recovery. This process showed promising preliminary results and thus further process development of AHGP was abandoned in favor of SSRP. The SSRP is a direct Claus process that consists of injecting SO{sub 2} directly into the quenched coal gas from a coal gasifier, and reacting the H{sub 2}S-SO{sub 2} mixture over a selective catalyst to both remove and recover sulfur in a single step. The process is conducted at gasifier pressure and 125 to 160 C. The proposed commercial embodiment of the SSRP involves a liquid phase of molten sulfur with dispersed catalyst in a slurry bubble-column reactor (SBCR).

Apostolos A. Nikolopoulos; Santosh K. Gangwal; William J. McMichael; Jeffrey W. Portzer

2003-01-01T23:59:59.000Z

93

Sulfur@Carbon Cathodes for Lithium Sulfur Batteries > Research...  

NLE Websites -- All DOE Office Websites (Extended Search)

Electrode Channel Flow DEMS Cell Sulfur@Carbon Cathodes for Lithium Sulfur Batteries Better Ham & Cheese: Enhanced Anodes and Cathodes for Fuel Cells Epitaxial Single...

94

Sulfur-Graphene Oxide Nanocomposite Cathodes for Lithium/Sulfur...  

NLE Websites -- All DOE Office Websites (Extended Search)

Advanced Materials Advanced Materials Find More Like This Return to Search Sulfur-Graphene Oxide Nanocomposite Cathodes for LithiumSulfur Cells Lawrence Berkeley National...

95

Hydrogen Production from Hydrogen Sulfide in IGCC Power Plants  

SciTech Connect

IGCC power plants are the cleanest coal-based power generation facilities in the world. Technical improvements are needed to help make them cost competitive. Sulfur recovery is one procedure in which improvement is possible. This project has developed and demonstrated an electrochemical process that could provide such an improvement. IGCC power plants now in operation extract the sulfur from the synthesis gas as hydrogen sulfide. In this project H{sub 2}S has been electrolyzed to yield sulfur and hydrogen (instead of sulfur and water as is the present practice). The value of the byproduct hydrogen makes this process more cost effective. The electrolysis has exploited some recent developments in solid state electrolytes. The proof of principal for the project concept has been accomplished.

Elias Stefanakos; Burton Krakow; Jonathan Mbah

2007-07-31T23:59:59.000Z

96

Elemental sulfur recovery process  

DOE Patents (OSTI)

An improved catalytic reduction process for the direct recovery of elemental sulfur from various SO[sub 2]-containing industrial gas streams. The catalytic process provides combined high activity and selectivity for the reduction of SO[sub 2] to elemental sulfur product with carbon monoxide or other reducing gases. The reaction of sulfur dioxide and reducing gas takes place over certain catalyst formulations based on cerium oxide. The process is a single-stage, catalytic sulfur recovery process in conjunction with regenerators, such as those used in dry, regenerative flue gas desulfurization or other processes, involving direct reduction of the SO[sub 2] in the regenerator off gas stream to elemental sulfur in the presence of a catalyst. 4 figures.

Flytzani-Stephanopoulos, M.; Zhicheng Hu.

1993-09-07T23:59:59.000Z

97

Sulfur-isotope separation by distillation  

SciTech Connect

Sulfur-isotope separation by low-temperature distillation of hydrogen sulfide was studied in an 8-m, 25-mm diameter distillation column. Column temperature was controlled by a propane-propylene heat pipe. Column packing HETP was measured using nitric oxide in the column. The column was operated at pressures from 45 to 125 kPa. The relative volatility of S-32 vs. S-34 varied from 1.0008 to 1.0014.

Mills, T.R.

1982-01-01T23:59:59.000Z

98

Thread gauge for measuring thread pitch diameters  

DOE Patents (OSTI)

A thread gauge which attaches to a vernier caliper to measure the thread pitch diameter of both externally threaded and internally threaded parts is disclosed. A pair of anvils are externally threaded with threads having the same pitch as those of the threaded part. Each anvil is mounted on a stem having a ball on which the anvil can rotate to properly mate with the parts to which the anvils are applied. The stems are detachably secured to the caliper blades by attachment collars having keyhole openings for receiving the stems and caliper blades. A set screw is used to secure each collar on its caliper blade. 2 figs.

Brewster, A.L.

1985-11-19T23:59:59.000Z

99

Thread gauge for measuring thread pitch diameters  

DOE Patents (OSTI)

A thread gauge which attaches to a vernier caliper to measure the thread pitch diameter of both externally threaded and internally threaded parts. A pair of anvils are externally threaded with threads having the same pitch as those of the threaded part. Each anvil is mounted on a stem having a ball on which the anvil can rotate to properly mate with the parts to which the anvils are applied. The stems are detachably secured to the caliper blades by attachment collars having keyhole openings for receiving the stems and caliper blades. A set screw is used to secure each collar on its caliper blade.

Brewster, Albert L. (R.R. 2, Box 190A, Pleasant Hill, MO 64080)

1985-01-01T23:59:59.000Z

100

Sulfur-tolerant anode materials for solid oxide fuel cell application  

SciTech Connect

This paper summarizes the degradation mechanisms for SOFC anodes in the presence of sulfur and recent developments in sulfur-tolerant anodes. There are two primary sulfur-degradation mechanisms for the anode materials: physical absorption of sulfur that blocks the hydrogen reaction sites, and chemical reaction that forms nickel sulfide. The sulfur-tolerant anodes are categorized into three kinds of materials: thiospinels and metal sulfides, metal cermets, and mixed ionic and electronic conductors. Each material has its own advantages and disadvantages, and the combined application of available materials to serve as different functional components in anodes through proper design may be effective to achieve a balance between stability and performance.

Gong, M. (West Virginia University, Morgantown, WV); Liu, X. (West Virginia University, Morgantown, WV); Trembly, J.; Johnson, C.

2007-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

An efficient pitch-by-pitch extraction algorithm through multimodal information  

Science Journals Connector (OSTI)

Abstract Sport video analysis facilitates the discovery of semantic structures in sport broadcast videos and enables a wide spectrum of applications. For example, coaches can analyze offensive and defensive plays performed during games to assess a team’s capabilities. In general, identifying interested shots, e.g. pitch shots, from broadcast baseball videos requires great human labor to browse through those videos. In this work, we proposed a novel technique that automatically extracts pitch-by-pitch shots by recognizing the reliable emergence of pitching speed displayed on the scoreboard, estimating when and where the pitcher is present, and identifying the pitch shots based on the pitcher’s motion degree. To validate the performance and accuracy of the proposed technique, we collected a dataset of baseball videos broadcasted in various countries. The experimental results verify that the proposed technique successfully extracts the desired pitch-by-pitch videos. Furthermore, it outperforms the state-of-the-art approach in terms of accuracy and time complexity.

Kai-Lung Hua; Chao-Ting Lai; Chuang-Wen You; Wen-Huang Cheng

2015-01-01T23:59:59.000Z

102

Structural Identification of the Monomeric Constituents of Petroleum Pitch  

Science Journals Connector (OSTI)

Although the molecular weight and structure of pitches are known to play a role in their suitability for a given application,(5, 9, 14) this understanding has been limited because of an inability to properly characterize the constituents of pitch. ... Monomer information about such pitches is needed to assist in the prediction of the molecular structures of the dimer and higher order oligomers present in petroleum pitch, because these oligomers serve as key precursors for the advanced carbon materials described above. ... However, because no prefractionation of the pitches was carried out, good resolution between the pitch components was not achieved. ...

W. A. Burgess; J. J. Pittman; R. K. Marcus; M. C. Thies

2010-07-13T23:59:59.000Z

103

The role of pitch in the recognition of vocalizations in songbirds and humans  

E-Print Network (OSTI)

absolute and relative pitch processing by EuropeanR. G. (1992). Relative pitch recognition in white-throatedmelody: infants use a relative pitch code. Cognition, 98(1),

Bregman, Micah Rendler

2012-01-01T23:59:59.000Z

104

An Exploratory Study of the Effect of Demodulation on Pitch Detection  

E-Print Network (OSTI)

the modulator and high frequency (pitch) information on thecarrier, thus making pitch detection using the carrierperformance study of several pitch detection algorithms,"

Cabuk, Aytekin Durmus

2012-01-01T23:59:59.000Z

105

Systems/Circuits Cortical Pitch Regions in Humans Respond Primarily to  

E-Print Network (OSTI)

Systems/Circuits Cortical Pitch Regions in Humans Respond Primarily to Resolved Harmonics and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Pitch of pitch perception havedifferentiatedbetweentemporalandspectralcues

Kanwisher, Nancy

106

Bacterial Sulfur Storage Globules  

NLE Websites -- All DOE Office Websites (Extended Search)

by I. J. Pickering and G. N. George by I. J. Pickering and G. N. George Sulfur is essential for all life, but it plays a particularly central role in the metabolism of many anaerobic microorganisms. Prominent among these are the sulfide-oxidizing bacteria that oxidize sulfide (S2-) to sulfate (SO42-). Many of these organisms can store elemental sulfur (S0) in "globules" for use when food is in short supply (Fig. 1). The chemical nature of the sulfur in these globules has been an enigma since they were first described as far back as 1887 (1); all known forms (or allotropes) of elemental sulfur are solid at room temperature, but globule sulfur has been described as "liquid", and it apparently has a low density – 1.3 compared to 2.1 for the common yellow allotrope a-sulfur. Various exotic forms of sulfur have been proposed to explain these properties, including micelles (small bubble-like structures) formed from long-chain polythionates, but all of these deductions have been based upon indirect evidence (for example the density was estimated by flotation of intact cells), and many questions remained.

107

Pitch-catch only ultrasonic fluid densitometer  

DOE Patents (OSTI)

The present invention is an ultrasonic fluid densitometer that uses a material wedge and pitch-catch only ultrasonic transducers for transmitting and receiving ultrasonic signals internally reflected within the material wedge. Density of a fluid is determined by immersing the wedge into the fluid and measuring reflection of ultrasound at the wedge-fluid interface.

Greenwood, Margaret S. (Richland, WA); Harris, Robert V. (Pasco, WA)

1999-01-01T23:59:59.000Z

108

On the Microscopic Origin of Cholesteric Pitch  

E-Print Network (OSTI)

We present a microscopic analysis of the instability of the nematic phase to chirality when molecular chirality is introduced perturbatively. We show that previously neglected short-range biaxial correlations play a crucial role in determining the cholesteric pitch. We propose an order parameter which quantifies the chirality of a molecule.

A. B. Harris; Randall D. Kamien; T. C. Lubensky

1996-07-11T23:59:59.000Z

109

Relativistic rapidity as change in musical pitch  

E-Print Network (OSTI)

Relativistic rapidity is usually presented as a computational device. As Levy-Leblond has shown, it is also the velocity that would be imputed by an ideal Newtonian inertial guidance system, taking c=1*neper=1. Here, we show that it can also be interpreted as the change in musical pitch of radiation fore and aft along the direction of motion.

Alma Teao Wilson

2007-06-22T23:59:59.000Z

110

Pitch-catch only ultrasonic fluid densitometer  

DOE Patents (OSTI)

The present invention is an ultrasonic fluid densitometer that uses a material wedge and pitch-catch only ultrasonic transducers for transmitting and receiving ultrasonic signals internally reflected within the material wedge. Density of a fluid is determined by immersing the wedge into the fluid and measuring reflection of ultrasound at the wedge-fluid interface. 6 figs.

Greenwood, M.S.; Harris, R.V.

1999-03-23T23:59:59.000Z

111

Microfluidic Hydrogen Fuel Cell with a Liquid Electrolyte  

Science Journals Connector (OSTI)

We report the design and characterization of a microfluidic hydrogen fuel cell with a flowing sulfuric acid solution instead of a Nafion membrane as the electrolyte. We studied the effect of cell resistance, hydrogen and oxygen flow rates, and electrolyte ...

Ranga S. Jayashree; Michael Mitchell; Dilip Natarajan; Larry J. Markoski; Paul J. A. Kenis

2007-05-19T23:59:59.000Z

112

Adaptive pitch control for variable speed wind turbines  

DOE Patents (OSTI)

An adaptive method for adjusting blade pitch angle, and controllers implementing such a method, for achieving higher power coefficients. Average power coefficients are determined for first and second periods of operation for the wind turbine. When the average power coefficient for the second time period is larger than for the first, a pitch increment, which may be generated based on the power coefficients, is added (or the sign is retained) to the nominal pitch angle value for the wind turbine. When the average power coefficient for the second time period is less than for the first, the pitch increment is subtracted (or the sign is changed). A control signal is generated based on the adapted pitch angle value and sent to blade pitch actuators that act to change the pitch angle of the wind turbine to the new or modified pitch angle setting, and this process is iteratively performed.

Johnson, Kathryn E. (Boulder, CO); Fingersh, Lee Jay (Westminster, CO)

2012-05-08T23:59:59.000Z

113

Video: Secretary Moniz Loosens Up For Earth Day Pitch | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Video: Secretary Moniz Loosens Up For Earth Day Pitch Video: Secretary Moniz Loosens Up For Earth Day Pitch April 21, 2014 - 4:11pm Addthis After work one night last week,...

114

Neural representations of pitch : role of peripheral frequency selectivity  

E-Print Network (OSTI)

Investigating the neural mechanisms underlying the perception of the pitch of harmonic complex tones is of great importance for many reasons. Changes in pitch convey melody in music, and the superposition of different ...

Cedolin, Leonardo

2006-01-01T23:59:59.000Z

115

Cholesteric helical pitch of near persistence length DNA  

Science Journals Connector (OSTI)

Cholesteric helical pitch of near persistence length DNA ... We report measurements of the cholesteric pitch and twist elastic constant (K22) in monodisperse suspensions of the rodlike virus filamentous bacteriophage fd. ...

David H. Van Winkle; Michael W. Davidson; Wan Xu Chen; Randolph L. Rill

1990-09-01T23:59:59.000Z

116

Pitch Contributions to the Cholesteric?Isotropic Interfacial Tension  

Science Journals Connector (OSTI)

Pitch Contributions to the Cholesteric?Isotropic Interfacial Tension ... A further complication is that the layer spacing, known as the pitch of the cholesteric helix, is a function of pressure, temperature, concentration, and the nematic scalar order parameter. ... 10,11,14 Since the pitch is a function of the scalar order parameter, at the cholesteric/isotropic interface, the gradients in the scalar order parameter lead to gradients in the pitch. ...

Alejandro D. Rey

2000-11-21T23:59:59.000Z

117

Cosmic Ray Pitch Angle Scattering Through 90 o  

E-Print Network (OSTI)

Cosmic Ray Pitch Angle Scattering Through 90 o G.M. Felice 1 and R.M. Kulsrud 2 Princeton Plasma­ lar attention to the problem of particle scattering through the # = cos -1 (v # /v) = 90 o pitch angle their pitch angle by mirror interaction with long wavelength waves generated by the # # 0 particles. We match

118

Human cortical sensorimotor network underlying feedback control of vocal pitch  

E-Print Network (OSTI)

Human cortical sensorimotor network underlying feedback control of vocal pitch Edward F. Changa,1 control of pitch using direct cortical recordings. Subjects phonated while a real-time signal processor briefly perturbed their output pitch (speak condition). Subjects later heard the same recordings

Knight, Robert T.

119

Pitch Based Sound Classification A master's thesis by  

E-Print Network (OSTI)

Pitch Based Sound Classification A master's thesis by Andreas Brinch Nielsen 15 August 2005 is on classification based on the pitch of the signal, and three classes, music, noise and speech, is used. Unfortunately pitch is not straightforward to extract, and the first part of the project is about finding

120

Mismatch Responses to Pitch Changes in Early Infancy  

E-Print Network (OSTI)

Mismatch Responses to Pitch Changes in Early Infancy Chao He, Lisa Hotson, and Laurel J. Trainor Abstract & We investigated the emergence of discriminative responses to pitch by recording 2-, 3-, and 4-month-old infants' electro- encephalogram responses to infrequent pitch changes in piano tones. In all

Trainor, Laurel J.

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

A TEMPORAL MODEL FOR PITCH MULTIPLICITY AND TONAL CONSONANCE  

E-Print Network (OSTI)

A TEMPORAL MODEL FOR PITCH MULTIPLICITY AND TONAL CONSONANCE Peter Cariani Eaton Peabody Laboratory@epl.meei.harvard.edu; www.cariani.com ABSTRACT One aspect of tonal consonance relevant to the pitch stability of chords and harmonic tension concerns the degree to which a collection of notes produces a unified, strong low pitch

Cariani, Peter

122

Research paper From noise to pitch: Transient and sustained responses  

E-Print Network (OSTI)

Research paper From noise to pitch: Transient and sustained responses of the auditory evoked field a novel component of the auditory evoked field, which is elicited by a tran- sition from noise to pitch in the absence of a change in energy. It is referred to as the `pitch onset response'. To extend our

Cambridge, University of

123

Pitch-based carbon foam and composites  

DOE Patents (OSTI)

A process for producing carbon foam or a composite is disclosed which obviates the need for conventional oxidative stabilization. The process employs mesophase or isotropic pitch and a simplified process using a single mold. The foam has a relatively uniform distribution of pore sizes and a highly aligned graphic structure in the struts. The foam material can be made into a composite which is useful in high temperature sandwich panels for both thermal and structural applications.

Klett, James W. (Knoxville, TN)

2002-01-01T23:59:59.000Z

124

Pitch-based carbon foam and composites  

DOE Patents (OSTI)

A process for producing carbon foam or a composite is disclosed which obviates the need for conventional oxidative stabilization. The process employs mesophase or isotropic pitch and a simplified process using a single mold. The foam has a relatively uniform distribution of pore sizes and a highly aligned graphic structure in the struts. The foam material can be made into a composite which is useful in high temperature sandwich panels for both thermal and structural applications.

Klett, James W. (Knoxville, TN)

2001-01-01T23:59:59.000Z

125

Simultaneous pitches are encoded separately in auditory cortex: an MMNm study  

E-Print Network (OSTI)

Simultaneous pitches are encoded separately in auditory cortex: an MMNm study Takako Fujiokaa.Mismatch negativity ¢elds were ex- amined when a pitch change occurred in either the higher-pitched or thelower-pitched, deviants to the lower-pitched, but not higher-pitched, tone within the two-tone dyad elicited a reduced

Trainor, Laurel J.

126

Cortical pitch response components show differential sensitivity to native and nonnative pitch contours  

Science Journals Connector (OSTI)

Abstract The aim of this study is to evaluate how nonspeech pitch contours of varying shape influence latency and amplitude of cortical pitch-specific response (CPR) components differentially as a function of language experience. Stimuli included time-varying, high rising Mandarin Tone 2 (T2) and linear rising ramp (Linear), and steady-state (Flat). Both the latency and magnitude of CPR components were differentially modulated by (i) the overall trajectory of pitch contours (time-varying vs. steady-state), (ii) their pitch acceleration rates (changing vs. constant), and (iii) their linguistic status (lexical vs. non-lexical). T2 elicited larger amplitude than Linear in both language groups, but size of the effect was larger in Chinese than English. The magnitude of CPR components elicited by T2 were larger for Chinese than English at the right temporal electrode site. Using the CPR, we provide evidence in support of experience-dependent modulation of dynamic pitch contours at an early stage of sensory processing.

Ananthanarayan Krishnan; Jackson T. Gandour; Chandan H. Suresh

2014-01-01T23:59:59.000Z

127

Florida Hydrogen Initiative  

SciTech Connect

The Florida Hydrogen Initiative (FHI) was a research, development and demonstration hydrogen and fuel cell program. The FHI program objectives were to develop Florida?s hydrogen and fuel cell infrastructure and to assist DOE in its hydrogen and fuel cell activities The FHI program funded 12 RD&D projects as follows: Hydrogen Refueling Infrastructure and Rental Car Strategies -- L. Lines, Rollins College This project analyzes strategies for Florida's early stage adaptation of hydrogen-powered public transportation. In particular, the report investigates urban and statewide network of refueling stations and the feasibility of establishing a hydrogen rental-car fleet based in Orlando. Methanol Fuel Cell Vehicle Charging Station at Florida Atlantic University ? M. Fuchs, EnerFuel, Inc. The project objectives were to design, and demonstrate a 10 kWnet proton exchange membrane fuel cell stationary power plant operating on methanol, to achieve an electrical energy efficiency of 32% and to demonstrate transient response time of less than 3 milliseconds. Assessment of Public Understanding of the Hydrogen Economy Through Science Center Exhibits, J. Newman, Orlando Science Center The project objective was to design and build an interactive Science Center exhibit called: ?H2Now: the Great Hydrogen Xchange?. On-site Reformation of Diesel Fuel for Hydrogen Fueling Station Applications ? A. Raissi, Florida Solar Energy Center This project developed an on-demand forecourt hydrogen production technology by catalytically converting high-sulfur hydrocarbon fuels to an essentially sulfur-free gas. The removal of sulfur from reformate is critical since most catalysts used for the steam reformation have limited sulfur tolerance. Chemochromic Hydrogen Leak Detectors for Safety Monitoring ? N. Mohajeri and N. Muradov, Florida Solar Energy Center This project developed and demonstrated a cost-effective and highly selective chemochromic (visual) hydrogen leak detector for safety monitoring at any facility engaged in transport, handling and use of hydrogen. Development of High Efficiency Low Cost Electrocatalysts for Hydrogen Production and PEM Fuel Cell Applications ? M. Rodgers, Florida Solar Energy Center The objective of this project was to decrease platinum usage in fuel cells by conducting experiments to improve catalyst activity while lowering platinum loading through pulse electrodeposition. Optimum values of several variables during electrodeposition were selected to achieve the highest electrode performance, which was related to catalyst morphology. Understanding Mechanical and Chemical Durability of Fuel Cell Membrane Electrode Assemblies ? D. Slattery, Florida Solar Energy Center The objective of this project was to increase the knowledge base of the degradation mechanisms for membranes used in proton exchange membrane fuel cells. The results show the addition of ceria (cerium oxide) has given durability improvements by reducing fluoride emissions by an order of magnitude during an accelerated durability test. Production of Low-Cost Hydrogen from Biowaste (HyBrTec?) ? R. Parker, SRT Group, Inc., Miami, FL This project developed a hydrogen bromide (HyBrTec?) process which produces hydrogen bromide from wet-cellulosic waste and co-produces carbon dioxide. Eelectrolysis dissociates hydrogen bromide producing recyclable bromine and hydrogen. A demonstration reactor and electrolysis vessel was designed, built and operated. Development of a Low-Cost and High-Efficiency 500 W Portable PEMFC System ? J. Zheng, Florida State University, H. Chen, Bing Energy, Inc. The objectives of this project were to develop a new catalyst structures comprised of highly conductive buckypaper and Pt catalyst nanoparticles coated on its surface and to demonstrate fuel cell efficiency improvement and durability and cell cost reductions in the buckypaper based electrodes. Development of an Interdisciplinary Hydrogen and Fuel Cell Technology Academic Program ? J. Politano, Florida Institute of Technology, Melbourne, FL This project developed a hydrogen and fuel cel

Block, David L

2013-06-30T23:59:59.000Z

128

Hydrogen and Nitrogen Control in Ladle and Casting Operations  

SciTech Connect

In recent years there has been an increasing demand to reduce and control the amount of dissolved gases in steel. Hydrogen and nitrogen are two of the most important gases which when dissolved in liquid steel affect its properties significantly. Several steelmaking additions have been investigated in this research for their effect on the hydrogen and nitrogen content of steels. It has been established that calcium hydroxide (hydrated lime) acts as a source of hydrogen. Carburizers, such as metallurgical coke, were found to result in no hydrogen pickup when added to liquid steel. Addition of petroleum coke, on the other hand, increased the hydrogen content of liquid steel. Ferroalloy such as medium carbon ferromanganese when added to the liquid iron was found to increase its nitrogen content, the increase being proportional to the amount of ferroalloy added. Similarly, addition of pitch coke, which had a significant nitrogen impurity, increased the nitrogen content of liquid iron. A mathematical model was developed to quantify the absorption of nitrogen and hydrogen from the air bubbles entrained during tapping of liquid steel. During the bottom stirring of liquid metal in a ladle, the inert gas escaping from the top displaces the slag layer and often forms an open eye. The absorption of atmospheric nitrogen through the spout eye was estimated for different slag thickness and gas flow rate. The ultimate goal of this research was to develop a comprehensive set of equations which could predict the nitrogen and hydrogen pickup from their various sources. Estimates of hydrogen and nitrogen pickup during the steel transfer operations such as tapping and ladle stirring and the predicted pickup from steelmaking additions were integrated into empirical equations. The comprehensive model is designed to predict the gas pickup under varying operating conditions such as the metal oxygen and sulfur content, the total tapping or stirring time, the stirring gas flow rate and the slag thickness. The model predictions are based on mathematical and empirical evidence which are derived from thermodynamic and kinetic fundamental principles.

Richard J. Fruehan; Siddhartha Misra

2005-01-15T23:59:59.000Z

129

DOE Hydrogen Analysis Repository: Distributed Hydrogen Fueling Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Distributed Hydrogen Fueling Systems Analysis Distributed Hydrogen Fueling Systems Analysis Project Summary Full Title: H2 Production Infrastructure Analysis - Task 1: Distributed Hydrogen Fueling Systems Analysis Project ID: 78 Principal Investigator: Brian James Keywords: Hydrogen infrastructure; costs; methanol; hydrogen fueling Purpose As the DOE considers both direct hydrogen and reformer-based fuel cell vehicles, it is vital to have a clear perspective of the relative infrastructure costs to supply each prospective fuel (gasoline, methanol, or hydrogen). Consequently, this analysis compares these infrastructure costs as well as the cost to remove sulfur from gasoline (as will most likely be required for use in fuel cell systems) and the cost implications for several hydrogen tank filling options. This analysis supports Analysis

130

Freeport Begins Offshore Sulfur Plant  

Science Journals Connector (OSTI)

Freeport Begins Offshore Sulfur Plant ... Discovered by Humble Oil & Refining, the sulfur deposit off Grand Isle is believed by industry observers to be one of the largest discovered in recent years. ...

1958-07-07T23:59:59.000Z

131

High-temperature sorbent method for removal of sulfur containing gases from gaseous mixtures  

DOE Patents (OSTI)

A copper oxide-zinc oxide mixture is used as a sorbent for removing hydrogen sulfide and other sulfur containing gases at high temperatures from a gaseous fuel mixture. This high-temperature sorbent is especially useful for preparing fuel gases for high temperature fuel cells. The copper oxide is initially reduced in a preconditioning step to elemental copper and is present in a highly dispersed state throughout the zinc oxide which serves as a support as well as adding to the sulfur sorption capacity. The spent sorbent is regenerated by high-temperature treatment with an air fuel, air steam mixture followed by hydrogen reduction to remove and recover the sulfur.

Young, John E. (Woodridge, IL); Jalan, Vinod M. (Concord, MA)

1984-01-01T23:59:59.000Z

132

High-temperature sorbent method for removal of sulfur-containing gases from gaseous mixtures  

DOE Patents (OSTI)

A copper oxide-zinc oxide mixture is used as a sorbent for removing hydrogen sulfide and other sulfur containing gases at high temperatures from a gaseous fuel mixture. This high-temperature sorbent is especially useful for preparing fuel gases for high temperature fuel cells. The copper oxide is initially reduced in a preconditioning step to elemental copper and is present in a highly dispersed state throughout the zinc oxide which serves as a support as well as adding to the sulfur sorbtion capacity. The spent sorbent is regenerated by high-temperature treatment with an air fuel, air steam mixture followed by hydrogen reduction to remove and recover the sulfur.

Young, J.E.; Jalan, V.M.

1982-07-07T23:59:59.000Z

133

High-temperature sorbent method for removal of sulfur containing gases from gaseous mixtures  

DOE Patents (OSTI)

A copper oxide-zinc oxide mixture is used as a sorbent for removing hydrogen sulfide and other sulfur containing gases at high temperatures from a gaseous fuel mixture. This high-temperature sorbent is especially useful for preparing fuel gases for high temperature fuel cells. The copper oxide is initially reduced in a preconditioning step to elemental copper and is present in a highly dispersed state throughout the zinc oxide which serves as a support as well as adding to the sulfur sorption capacity. The spent sorbent is regenerated by high-temperature treatment with an air fuel, air steam mixture followed by hydrogen reduction to remove and recover the sulfur.

Young, J.E.; Jalan, V.M.

1984-06-19T23:59:59.000Z

134

SULFUR POLYMER ENCAPSULATION.  

SciTech Connect

Sulfur polymer cement (SPC) is a thermoplastic polymer consisting of 95 wt% elemental sulfur and 5 wt% organic modifiers to enhance long-term durability. SPC was originally developed by the U.S. Bureau of Mines as an alternative to hydraulic cement for construction applications. Previous attempts to use elemental sulfur as a construction material in the chemical industry failed due to premature degradation. These failures were caused by the internal stresses that result from changes in crystalline structure upon cooling of the material. By reacting elemental sulfur with organic polymers, the Bureau of Mines developed a product that successfully suppresses the solid phase transition and significantly improves the stability of the product. SPC, originally named modified sulfur cement, is produced from readily available, inexpensive waste sulfur derived from desulfurization of both flue gases and petroleum. The commercial production of SPC is licensed in the United States by Martin Resources (Odessa, Texas) and is marketed under the trade name Chement 2000. It is sold in granular form and is relatively inexpensive ({approx}$0.10 to 0.12/lb). Application of SPC for the treatment of radioactive, hazardous, and mixed wastes was initially developed and patented by Brookhaven National Laboratory (BNL) in the mid-1980s (Kalb and Colombo, 1985; Colombo et al., 1997). The process was subsequently investigated by the Commission of the European Communities (Van Dalen and Rijpkema, 1989), Idaho National Engineering Laboratory (Darnell, 1991), and Oak Ridge National Laboratory (Mattus and Mattus, 1994). SPC has been used primarily in microencapsulation applications but can also be used for macroencapsulation of waste. SPC microencapsulation has been demonstrated to be an effective treatment for a wide variety of wastes, including incinerator hearth and fly ash; aqueous concentrates such as sulfates, borates, and chlorides; blowdown solutions; soils; and sludges. It is not recommended for treatment of wastes containing high concentrations of nitrates because of potentially dangerous reactions between sulfur, nitrate, and trace quantities of organics. Recently, the process has been adapted for the treatment of liquid elemental mercury and mercury contaminated soil and debris.

KALB, P.

2001-08-22T23:59:59.000Z

135

Process for recovery of hydrogen and  

DOE Patents (OSTI)

on of sulfur Abstract A process of abstracting sulfur from H.sub.2 S and generating hydrogen is disclosed comprising dissolving Pd.sub.2 X.sub.2 (.mu.-dppm).sub.2 in a solvent and then introducing H.sub.2 S. The palladium complex abstracts sulfur, forming hydrogen and a (.mu.-S) complex. The (.mu.-S) complex is readily oxidizable to a (.mu.-SO.sub.2) adduct which spontaneously loses SO.sub.2 and regenerates the palladium complex.

James, Brian R. (Vancouver, CA); Li-Lee, Chung (Vancouver, CA); Lilga, Michael A. (Richland, WA); Nelson, David A. (Richland, WA)

1987-01-01T23:59:59.000Z

136

The HYSULF{sup SM} process: A valuable hydrogen resource from hydrogen sulfide  

SciTech Connect

The increasing demand for hydrogen to reduce the sulfur content in standard refinery fuels is a very familiar problem to everyone in the industry. This problem could be partially offset by the continuous recycling of the hydrogen portion of hydrogen sulfide. In this regard, Marathon has been developing the HYSULF process. This process uses Redox chemistry under mild operating conditions to convert hydrogen sulfide into hydrogen and sulfur. The process employs two basic steps, i.e., a sulfur production and recovery step and a hydrogen production step. All chemicals and the catalyst used in the HYSULF process are either commercially available or are slight modifications of available materials. Also, the chemistry used in the HYSULF process is similar to that used in commercial desulfurization and gas sweetening processes.

Plummer, M.A. [Marathon Oil Co., Littleton, CO (United States)

1995-09-01T23:59:59.000Z

137

Why sequence Alkaliphilic sulfur oxidizing bacteria for sulfur pollution  

NLE Websites -- All DOE Office Websites (Extended Search)

Alkaliphilic sulfur oxidizing Alkaliphilic sulfur oxidizing bacteria for sulfur pollution remediation? Burning sulfur-containing fuels, such as coal, oil, and natural gas, contributes significantly to global environmental problems, such as air pollution and acid rain, besides contributing to the loss of the ozone layer. One method of managing sulfur compounds released as byproducts from industrial processes is to scrub them out using chemical treatments and activated charcoal beds. A lower-cost solution relies on incorporating alkaliphic sulfur-oxidizing bacteria into biofilters to convert the volatile and toxic compounds into insoluble sulfur for easier removal. Discovered in the last decade, these bacteria have been found to thrive in habitats that span the full pH range. The bacteria could have applications

138

Light propagation in chiral media with large pitch  

Science Journals Connector (OSTI)

Light propagation in uniaxial chiral media with large pitch is studied. In these systems there are forbidden zones for extraordinary beams, which lead to effective reflection on zone...

Aksenova, Elena V; Karetnikov, Aleksandr A; Kovshik, Aleksandr P; Kryukov, Evgeny V; Romanov, Vadim P

2008-01-01T23:59:59.000Z

139

Factors influencing electrical place pitch perception in bimodal listeners  

Science Journals Connector (OSTI)

Factors that might affect perceptual pitch match between acoustic and electric stimulation were examined in 25 bimodal listeners using magnitude estimation. Pre-operative acoustic thresholds in both ears and duration of severe-profound loss were first examined as correlates with degree of match between the measured pitch and that predicted by the spiral ganglion frequency-position model. The degree of match was examined with respect to (1) the ratio between the measured and predicted pitch percept on the most apical electrode and (2) the ratio between the slope of the measured and predicted pitch function. Second effect of listening experience was examined to assess whether adaptation occurred over time to match the frequency assignment to electrodes. Pre-experience pitch estimates on the apical electrode were within the predicted range in only 28% of subjects and the slope of the electrical pitch function was lower than predicted in all except one subject. Subjects with poorer hearing tended to have a lower pitch and a shallower electrical pitch function than predicted by the model. Pre-operative hearing thresholds in the contralateral ear and hearing loss duration were not correlated with the degree of pitch match and there was no significant group effect of listening experience.

Hugh J. McDermott; Richard J. M. van Hoesel; Pamela W. Dawson; Robert S. Cowan

2014-01-01T23:59:59.000Z

140

Pitch and torque control of variable speed wind turbines.  

E-Print Network (OSTI)

??In this thesis the torque, speed and pitch angle control of variable speed wind turbine is investigated. In particular, it concentrates on the extraction of… (more)

Kulka, Arkadiusz

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Pitch Perception of Complex Sounds: Nonlinearity Revisited  

E-Print Network (OSTI)

The ability of the auditory system to perceive the fundamental frequency of a sound even when this frequency is removed from the stimulus is an interesting phenomenon related to the pitch of complex sounds. This capability is known as ``residue'' or ``virtual pitch'' perception and was first reported last century in the pioneering work of Seebeck. It is residue perception that allows one to listen to music with small transistor radios, which in general have a very poor and sometimes negligible response to low frequencies. The first attempt, due to Helmholtz, to explain the residue as a nonlinear effect in the ear considered it to originate from difference combination tones. However, later experiments have shown that the residue does not coincide with a difference combination tone. These results and the fact that dichotically presented signals also elicit residue perception have led to nonlinear theories being gradually abandoned in favour of central processor models. In this paper we use recent results from the theory of nonlinear dynamical systems to show that physical frequencies produced by generic nonlinear oscillators acted upon by two independent periodic excitations can reproduce with great precision most of the experimental data about the residue without resorting to any kind of central processing mechanism.

D. L. Gonzalez; L. Morettini; F. Sportolari; O. Rosso; J. H. E. Cartwright; O. Piro

1995-05-05T23:59:59.000Z

142

Sulfur-deactivated steam reforming of gasified biomass  

SciTech Connect

The effect of hydrogen sulfide on the stream reforming of methane has been studied. Methane is the most difficult component to convert by steam reforming in the mixture of hydrocarbons, which is produced in biomass gasification. Two catalysts were subjected to hydrogen sulfide levels up to 300 ppm so as to study the effect of sulfur on their deactivation. These catalysts were the C11-9-061, from United Catalyst Inc., and the HTSR1, from Haldor Topsoee. The activation energy of the sulfur-deactivated steam-reforming reaction was calculated to be 280 and 260 kJ/mol, for each catalyst, respectively. The high values most probably originate from the fact that the degree of sulfur coverage of the nickel surface is close to 1 for these experiments. Even under these severe conditions, steam reforming of methane is possible without any carbon formation. The HTSR1 catalyst exhibits a very high sulfur-free activity, resulting in a performance in the presence of hydrogen sulfide higher than that for the C11-9-061 catalyst. By using the HTSR1 catalyst, the reactor temperature can be lowered by 60 C in order to reach comparable levels of conversion.

Koningen, J.; Sjoestroem, K. [Kungl Tekniska Hoegskolan, Stockholm (Sweden)] [Kungl Tekniska Hoegskolan, Stockholm (Sweden)

1998-02-01T23:59:59.000Z

143

Human cortical sensorimotor network underlying feedback control of vocal pitch  

Science Journals Connector (OSTI)

...self-produced speech are suppressed (listening > speaking). Self-vocalization...pitch feedback (speaking > listening) (23), a phenomenon called...digital signal-processing device (DSP) to induce real-time pitch...differed between speaking and listening. (High-{gamma...

Edward F. Chang; Caroline A. Niziolek; Robert T. Knight; Srikantan S. Nagarajan; John F. Houde

2013-01-01T23:59:59.000Z

144

subm. to Surf. Sci. Ab initio molecular dynamics study of H2 adsorption on sulfur-and chlorine-covered  

E-Print Network (OSTI)

subm. to Surf. Sci. Ab initio molecular dynamics study of H2 adsorption on sulfur- and chlorine/Germany The adsorption of molecular hydrogen on sulfur- and chlorine-covered Pd(100) in a (2Ã?2) geometry is studied by ab initio molecular dynamics simulations. The potential energy surfaces of H2/S(2 Ã? 2)/Pd(100) and H2/Cl(2

Ulm, Universität

145

It's Elemental - The Element Sulfur  

NLE Websites -- All DOE Office Websites (Extended Search)

Phosphorus Phosphorus Previous Element (Phosphorus) The Periodic Table of Elements Next Element (Chlorine) Chlorine The Element Sulfur [Click for Isotope Data] 16 S Sulfur 32.065 Atomic Number: 16 Atomic Weight: 32.065 Melting Point: 388.36 K (115.21°C or 239.38°F) Boiling Point: 717.75 K (444.60°C or 832.28°F) Density: 2.067 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Non-metal Period Number: 3 Group Number: 16 Group Name: Chalcogen What's in a name? From the Sanskrit word sulvere and the Latin word sulphurium. Say what? Sulfur is pronounced as SUL-fer. History and Uses: Sulfur, the tenth most abundant element in the universe, has been known since ancient times. Sometime around 1777, Antoine Lavoisier convinced the rest of the scientific community that sulfur was an element. Sulfur is a

146

Why sequence purple sulfur bacteria?  

NLE Websites -- All DOE Office Websites (Extended Search)

purple sulfur bacteria? purple sulfur bacteria? The process by which plants and some bacteria can convert light energy to sugar, or photosynthesis, is crucial to global food webs, and complicated. Very little is known about the photosynthetic bacteria in the purple sulfur bacteria group, which may represent one of the most primitive photosynthetic organisms and are capable of carbon fixation and sequestration in both light and dark conditions with the help of sulfur compounds. Purple sulfur bacteria are autotrophic and can synthesize organic compounds from inorganic sources. Researchers hope to learn more by sequencing nine type strains of purple sulfur bacteria that are found in freshwater, brackish and marine systems. The information would lead to a better understanding of the process of photosynthesis as well as the global

147

Continuous sulfur removal process  

DOE Patents (OSTI)

A continuous process for the removal of hydrogen sulfide from a gas stream using a membrane comprising a metal oxide deposited on a porous support is disclosed. 4 figures.

Jalan, V.; Ryu, J.

1994-04-26T23:59:59.000Z

148

The SEMATECH Berkeley MET: extending EUV learning to 16-nm half pitch  

E-Print Network (OSTI)

EUV learning to 16-nm half pitch Christopher N. Anderson 1 ,optimized for 18-nm half pitch. Five chemically ampli?edEUV develoment beyond 22-nm half pitch. Proc. of SPIE, 7636(

Anderson, Christopher N.

2012-01-01T23:59:59.000Z

149

EUV actinic defect inspection and defect printability at the sub-32 nm half pitch  

E-Print Network (OSTI)

at the Sub-32 run Half-pitch Sungmin Huha, Patrick Kearneya,below the 32 nm half-pitch node. Phase defect printabilityfor the sub-32 nm half-pitch technology node. Defect

Huh, Sungmin

2010-01-01T23:59:59.000Z

150

The neural bases underlying pitch processing difficulties Jessica M. Foxton a,  

E-Print Network (OSTI)

The neural bases underlying pitch processing difficulties Jessica M. Foxton a, , Nathan Weisz Hemisphere differences Individual differences Magnetoencephalography MEG Mismatch negativity Pitch direction Normal listeners are often surprisingly poor at processing pitch changes. The neural bases

151

Company Summary Comment Example RPI NYS Walmart Rice 1 Line Pitch Explain your venture in 140  

E-Print Network (OSTI)

Company Summary Comment Example RPI NYS Walmart Rice 1 Line Pitch Explain your venture in 140 Members Advisors Previous Investors Elevator Pitch 60 second pitch. Do this at the end. Contact Name x x x

Linhardt, Robert J.

152

Investigating the use of wing sweep for pitch control of a small unmanned air vehicle  

E-Print Network (OSTI)

the Use of Wing Sweep for Pitch Control of a Small Unmannedthe Use of Wing Sweep for Pitch Control of a Small UnmannedVariation of wing sweep for pitch control was identified as

Wright, Kim

2011-01-01T23:59:59.000Z

153

The SEMATECH Berkeley MET pushing EUV development beyond 22-nm half pitch  

E-Print Network (OSTI)

EUV development beyond 22-nm half pitch Patrick Naulleau,]to approximately 22-nm half pitch resolution. However,of this tool to half pitches of 18 nm and below, This

Naulleau, P.

2010-01-01T23:59:59.000Z

154

COMPONENT DEVELOPMENT NEEDS FOR THE HYBRID SULFUR ELECTROLYZER  

SciTech Connect

Fiscal year 2008 studies in electrolyzer component development have focused on the characterization of membrane electrode assemblies (MEA) after performance tests in the single cell electrolyzer, evaluation of electrocatalysts and membranes using a small scale electrolyzer and evaluating the contribution of individual cell components to the overall electrochemical performance. Scanning electron microscopic (SEM) studies of samples taken from MEAs testing in the SRNL single cell electrolyzer test station indicates a sulfur-rich layer forms between the cathode catalyst layer and the membrane. Based on a review of operating conditions for each of the MEAs evaluated, we conclude that the formation of the layer results from the reduction of sulfur dioxide as it passes through the MEA and reaches the catalyst layer at the cathode-membrane interface. Formation of the sulfur rich layer results in partial delamination of the cathode catalyst layer leading to diminished performance. Furthermore we believe that operating the electrolyzer at elevated pressure significantly increases the rate of formation due to increased adsorption of hydrogen on the internal catalyst surface. Thus, identification of a membrane that exhibits much lower transport of sulfur dioxide is needed to reduce the quantity of sulfur dioxide that reaches the cathode catalyst and is reduced to produce the sulfur-rich layer. Three candidate membranes are currently being evaluated that have shown promise from preliminary studies, (1) modified Nafion{reg_sign}, (2) polybenzimidazole (PBI), and (3) sulfonated Diels Alder polyphenylene (SDAPP). Testing examined the activity for the sulfur dioxide oxidation of platinum (Pt) and platinum-alloy catalysts in 30 wt% sulfuric acid solution. Linear sweep voltammetry showed an increase in activity when catalysts in which Pt is alloyed with non-noble transition metals such as cobalt and chromium. However when Pt is alloyed with noble metals, such as iridium or ruthenium, the kinetic activity decreases. We recommend further testing to determine if these binary alloys will provide the increased reaction kinetic needed to meet the targets. We also plan to test the performance of these catalyst materials for both proton and sulfur dioxide reduction. The latter may provide another parameter by which we can control the reduction of sulfur dioxide upon transport to the cathode catalyst surface. A small scale electrolyzer (2 cm{sup 2}) has been fabricated and successfully installed as an additional tool to evaluate the effect of different operating conditions on electrolyzer and MEA performance. Currently this electrolyzer is limited to testing at temperatures up to 80 C and at atmospheric pressure. Selected electrochemical performance data from the single cell sulfur dioxide depolarized electrolyzer were analyzed with the aid of an empirical equation which takes into account the overpotential of each of the components. By using the empirical equation, the performance data was broken down into its components and a comparison of the potential losses was made. The results indicated that for the testing conditions of 80 C and 30 wt% sulfuric acid, the major overpotential contribution ({approx}70 % of all losses) arise from the slow reaction rate of oxidation of sulfur dioxide. The results indicate that in order to meet the target of hydrogen production at 0.5 A/cm{sup 2} at 0.6 V and 50 wt% sulfuric acid, identification of a better catalyst for sulfur dioxide oxidation will provide the largest gain in electrolyzer performance.

Hobbs, D; Hector Colon-Mercado, H; Mark Elvington, M

2008-05-30T23:59:59.000Z

155

Microbial transformations of sulfur compounds  

Science Journals Connector (OSTI)

Oct 13, 1978 ... tains a large part of the chemical energy transferred ... ical energy is partly preserved in the bio- mass of .... ethanol to remove elemental sulfur.

2000-01-10T23:59:59.000Z

156

Novel Sulfur-Tolerant Anodes for Solid Oxide Fuel Cells  

SciTech Connect

One of the unique advantages of SOFCs over other types of fuel cells is the potential for direct utilization of hydrocarbon fuels (it may involve internal reforming). Unfortunately, most hydrocarbon fuels contain sulfur, which would dramatically degrade SOFC performance at parts-per-million (ppm) levels. Low concentration of sulfur (ppm or below) is difficult to remove efficiently and cost-effectively. Therefore, knowing the exact poisoning process for state-of-the-art anode-supported SOFCs with Ni-YSZ cermet anodes, understanding the detailed anode poisoning mechanism, and developing new sulfur-tolerant anodes are essential to the promotion of SOFCs that run on hydrocarbon fuels. The effect of cell operating conditions (including temperature, H{sub 2}S concentration, cell voltage/current density, etc.) on sulfur poisoning and recovery of nickel-based anode in SOFCs was investigated. It was found that sulfur poisoning is more severe at lower temperature, higher H{sub 2}S concentration or lower cell current density (higher cell voltage). In-situ Raman spectroscopy identified the nickel sulfide formation process on the surface of a Ni-YSZ electrode and the corresponding morphology change as the sample was cooled in H{sub 2}S-containing fuel. Quantum chemical calculations predicted a new S-Ni phase diagram with a region of sulfur adsorption on Ni surfaces, corresponding to sulfur poisoning of Ni-YSZ anodes under typical SOFC operating conditions. Further, quantum chemical calculations were used to predict the adsorption energy and bond length for sulfur and hydrogen atoms on various metal surfaces. Surface modification of Ni-YSZ anode by thin Nb{sub 2}O{sub 5} coating was utilized to enhance the sulfur tolerance. A multi-cell testing system was designed and constructed which is capable of simultaneously performing electrochemical tests of 12 button cells in fuels with four different concentrations of H{sub 2}S. Through systematical study of state-of-the-art anode-supported SOFC button cells, it is seen that the long-term sulfur poisoning behavior of those cells indicate that there might be a second-stage slower degradation due to sulfur poisoning, which would last for a thousand hour or even longer. However, when using G-18 sealant from PNNL, the 2nd stage poisoning was effectively prohibited.

Lei Yang; Meilin Liu

2008-12-31T23:59:59.000Z

157

HYBRID SULFUR ELECTROLYZER DEVELOPMENT FY09 SECOND QUARTER REPORT  

SciTech Connect

The primary objective of the DOE-NE Nuclear Hydrogen Initiative (NHI) is to develop the nuclear hydrogen production technologies necessary to produce hydrogen at a cost competitive with other alternative transportation fuels. The focus of the NHI is on thermochemical cycles and high temperature electrolysis that can be powered by heat from high temperature gas reactors. The Savannah River National Laboratory (SRNL) has been tasked with the primary responsibility to perform research and development in order to characterize, evaluate and develop the Hybrid Sulfur (HyS) thermochemical process. This report documents work during the first quarter of Fiscal Year 2009, for the period between January 1, 2009 and March 31, 2009. The HyS Process is a two-step hybrid thermochemical cycle that is part of the 'Sulfur Family' of cycles. As a sulfur cycle, it uses high temperature thermal decomposition of sulfuric acid to produce oxygen and to regenerate the sulfur dioxide reactant. The second step of the process uses a sulfur dioxide depolarized electrolyzer (SDE) to split water and produce hydrogen by electrochemically reacting sulfur dioxide with H{sub 2}O. The SDE produces sulfuric acid, which is then sent to the acid decomposer to complete the cycle. The DOE NHI program is developing the acid decomposer at Sandia National Laboratory for application to both the HyS Process and the Sulfur Iodine Cycle. The SDE is being developed at SRNL. During FY05 and FY06, SRNL designed and conducted proof-of-concept testing for a SDE using a low temperature, PEM fuel cell-type design concept. The advantages of this design concept include high electrochemical efficiency, small footprint and potential for low capital cost, characteristics that are crucial for successful implementation on a commercial scale. During FY07, SRNL extended the range of testing of the SDE to higher temperature and pressure, conducted a 100-hour longevity test with a 60-cm{sup 2} single cell electrolyzer, and designed and built a larger, multi-cell stack electrolyzer. During FY08, SRNL continued SDE development, including development and successful testing of a three-cell electrolyzer stack with a rated capacity of 100 liters per hour. The HyS program for FY09 program will address improving SDE performance by focusing on preventing or minimizing sulfur deposition inside the cell caused by SO{sub 2} crossover, reduction of cell voltage for improved efficiency, an extension of cell operating lifetime. During FY09 a baseline technology development program is being conducted to address each of these issues. Button-cell (2-cm{sup 2}) and single cell (60-cm{sup 2}) SDEs will be fabricated and tested. A pressurized button-cell test facility will be designed and constructed to facilitate addition testing. The single cell test facility will be upgraded for unattended operation, and later for operation at higher temperature and pressure. Work will continue on development of the Gas Diffusion Electrode (GDE), or Gap Cell, as an alternative electrolyzer design approach that is being developed under subcontract with industry partner Giner Electrochemical Systems. If successful, it could provide an alternative means of preventing sulfur crossover through the proton exchange membrane, as well as the possibility for higher current density operation based on more rapid mass transfer in a gas-phase anode. Promising cell components will be assembled into membrane electrode assemblies (MEAs) and tested in the single cell test facility. Upon modification for unattended operation, test will be conducted for 200 hours or more. Both the button-cell and modified single cell facility will be utilized to demonstrate electrolyzer operation without sulfur build-up limitations, which is a Level 1 Milestone.

Herman, D; David Hobbs, D; Hector Colon-Mercado, H; Timothy Steeper, T; John Steimke, J; Mark Elvington, M

2009-04-15T23:59:59.000Z

158

Characterization of medium-temperature Sasol–Lurgi gasifier coal tar pitch  

Science Journals Connector (OSTI)

Medium-temperature gasifier pitch (MTP) is only partly soluble in acetonitrile, methanol and ethanol. Single-stage pitch extraction with a large quantity of methanol yielded two liquid phases containing 76 wt.% and 27 wt.% pitch respectively. The pitch fractions recovered from these two phases featured similar aromaticity indices. However, the pitch from the pitch-rich phase had a higher average molar mass and gave an improved carbon yield at 1000 °C. Analysis of the methanol-insoluble pitch fraction showed that methanol extraction at reflux temperatures effectively removed boronic acid model compounds from pitch samples spiked with the same.

Gedion Papole; Walter W. Focke; Ncholu Manyala

2012-01-01T23:59:59.000Z

159

Optimized pitch button blocking for polishing high-aspect-ratio optics  

Science Journals Connector (OSTI)

Pitch button blocking (PBB), involving attaching small pitch buttons between the back of a thin workpiece (i.e., optic) and a blocking plate, enables noncompliant convergent polishing...

Feit, Michael D; DesJardin, Richard P; Steele, William A; Suratwala, Tayyab I

2012-01-01T23:59:59.000Z

160

Development of Mesophase from a Low-Temperature Coal Tar Pitch  

Science Journals Connector (OSTI)

In this investigation, three distinctly different pitches (petroleum, low-temperature and high-temperature coal tar) have been used to study the influence of the nature and composition of the precursor pitch on the formation and development of mesophase. ... Special emphasis is placed on the low-temperature coal tar pitch in an attempt to study the influence of its unique chemical composition as compared to other conventional CM precursor pitches. ... Several carbonization conditions have been tested for the three pitches of different nature and origin:? CTP1 (low-temperature coal tar pitch), CTP2 (high-temperature coal tar pitch), and PP (petroleum pitch). ...

Roberto García; José L. Crespo; Shona C. Martin; Colin E. Snape; Sabino R. Moinelo

2003-01-28T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Investigation of Bonding Mechanism of Coking on Semi-coke from Lignite with Pitch and Tar  

Science Journals Connector (OSTI)

Investigation of Bonding Mechanism of Coking on Semi-coke from Lignite with Pitch and Tar ... Study on the coking mechanism of coal and coal tar pitches. ...

Vedat Arslan

2006-08-16T23:59:59.000Z

162

Long-pitch cholesteric liquid crystal cell for switchable achromatic reflection  

Science Journals Connector (OSTI)

We propose a switchable achromatic reflector using a long-pitch cholesteric liquid crystal (CLC) whose Bragg reflection wavelength is chosen to be infrared by controlling the pitch...

Kim, Ki-Han; Jin, Hye-Jung; Park, Kyoung-Ho; Lee, Joun-Ho; Kim, Jae Chang; Yoon, Tae-Hoon

2010-01-01T23:59:59.000Z

163

Hybrid Sulfur Thermochemical Process Development Annual Report  

SciTech Connect

The Hybrid Sulfur (HyS) Thermochemical Process is a means of producing hydrogen via water-splitting through a combination of chemical reactions and electrochemistry. Energy is supplied to the system as high temperature heat (approximately 900 C) and electricity. Advanced nuclear reactors (Generation IV) or central solar receivers can be the source of the primary energy. Large-scale hydrogen production based on this process could be a major contributor to meeting the needs of a hydrogen economy. This project's objectives include optimization of the HyS process design, analysis of technical issues and concerns, creation of a development plan, and laboratory-scale proof-of-concept testing. The key component of the HyS Process is the SO2-depolarized electrolyzer (SDE). Studies were performed that showed that an electrolyzer operating in the range of 500-600 mV per cell can lead to an overall HyS cycle efficiency in excess of 50%, which is superior to all other currently proposed thermochemical cycles. Economic analysis indicated hydrogen production costs of approximately $1.60 per kilogram for a mature nuclear hydrogen production plant. However, in order to meet commercialization goals, the electrolyzer should be capable of operating at high current density, have a long operating lifetime , and have an acceptable capital cost. The use of proton-exchange-membrane (PEM) technology, which leverages work for the development of PEM fuel cells, was selected as the most promising route to meeting these goals. The major accomplishments of this project were the design and construction of a suitable electrolyzer test facility and the proof-of-concept testing of a PEM-based SDE.

Summers, William A.; Buckner, Melvin R.

2005-07-21T23:59:59.000Z

164

Stimulus-dependent flexibility in non-human auditory pitch processing Micah R. Bregman a,b  

E-Print Network (OSTI)

Stimulus-dependent flexibility in non-human auditory pitch processing Micah R. Bregman a Accepted 8 August 2011 Available online 10 September 2011 Keywords: Absolute pitch Relative pitch Pitch to recognize acoustic sequences shifted in absolute pitch (pitch height). Whereas humans maintain accurate rec

Patel, Aniruddh D.

165

Dual-Pitch Processing Mechanisms in Primate Auditory Cortex  

E-Print Network (OSTI)

Pitch, our perception of how high or low a sound is on a musical scale, is a fundamental perceptual attribute of sounds and is important for both music and speech. After more than a century of research, the exact mechanisms ...

Bendor, Daniel

166

Annual Energy Review 2002  

Gasoline and Diesel Fuel Update (EIA)

and other manufactured waste gases derived from fossil fuels. b Batteries, chemicals, hydrogen, pitch, purchased steam, sulfur, and miscellaneous technologies. c Pumped storage...

167

Annual Energy Review 2011 - Released September 2012  

Annual Energy Outlook 2012 (EIA)

and other manufactured and waste gases derived from fossil fuels. 2 Batteries, chemicals, hydrogen, pitch, purchased steam, sulfur, miscellaneous technologies, and non-renewable...

168

Annual Energy Review 2008 - Released June 2009  

Gasoline and Diesel Fuel Update (EIA)

other manufactured and waste gases derived from fossil fuels. 2 Batteries, chemicals, hydrogen, pitch, purchased steam, sulfur, miscellaneous technologies, and non-renewable waste...

169

Kalman prediction with Pitch Compensating Quantization for ADPCM voice coding  

E-Print Network (OSTI)

KALMAN PREDICTION WITH PITCH COMPENSATING QUANTIZATION FOR ADPCM VOICE CODING A Thesis by VICTOR PAUL BERGLUND Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE December 1978 Major Subject: Electrical Engineering KALMAN PREDICTION WITH PITCH COMPENSATING QUANTIZATION FOR ADPCM VOICE CODING A These s by VICTOR PAUL BERGLUND Approved as to sty1e and content by: airma $o Head of Depa ent Member...

Berglund, Victor Paul

2012-06-07T23:59:59.000Z

170

Segmentation of speech based on adaptive pitch prediction  

E-Print Network (OSTI)

SEGMENTATION OF SPEECH BASED ON ADAPTIVE PITCH PREDICTION A Thesis by JAN ERIK 8DEGARD Submitted to the 0%ce of Graduate Studies of Texas ARM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August... 1990 Major Subject: Electrical Engineering SEGMENTATION OF SPEECH BASED OiN ADAPTIVE PITCH PREDICTION A Thesis by JAN ERII( 8DEGARD Approved as to style and content, by: Shiping Li (Chair of Committee) D. R. Halverson J. H. Painter (Ivlernber...

Ødega?rd, Jan Erik

2012-06-07T23:59:59.000Z

171

Hydrogen Highways  

E-Print Network (OSTI)

adequate on-board hydrogen storage is essential, and remainsjustify their costs. Hydrogen storage remains an importantto 10,000 psi, liquid hydrogen storage, and other solid and

Lipman, Timothy

2005-01-01T23:59:59.000Z

172

Enhanced Pitch Sensitivity in Individuals with Autism: A Signal Detection Analysis  

E-Print Network (OSTI)

Enhanced Pitch Sensitivity in Individuals with Autism: A Signal Detection Analysis Anna Bonnel1 groups in memo- rizing picture­pitch associations and in detecting pitch changes in melodies. A subset of individuals with autism, known as ``musical savants,'' is also known to possess absolute pitch

173

The Effect of Temporal Context on the Sustained Pitch Response in Human  

E-Print Network (OSTI)

The Effect of Temporal Context on the Sustained Pitch Response in Human Auditory Cortex Alexander pitch. Pitch strength is important for the perceptual distinctive- ness of an acoustic event. In this magnetoencephalography study, we evaluate how temporal context influences the sustained pitch response (SPR) in lateral

Cambridge, University of

174

Cortical representations of pitch in monkeys and humans Daniel Bendor and Xiaoqin Wang  

E-Print Network (OSTI)

Cortical representations of pitch in monkeys and humans Daniel Bendor and Xiaoqin Wang Pitch acoustic environment. How pitch is represented in the cerebral cortex has for a long time remained-primary region of auditory cortex in primates that contains a cortical representation of pitch. Addresses

Wang, Xiaoqin

175

Context Effects in Musicians with Absolute Pitch Kathleen R. Agres & Dr. Lori L. Holt  

E-Print Network (OSTI)

Context Effects in Musicians with Absolute Pitch Kathleen R. Agres & Dr. Lori L. Holt Psychology tones and one of pure tones. Every perfect Western pitch was presented 5 times. Listeners identified created. Stimuli: Results & Conclusion Conclusions Pitch context test Pitch context test This research

Holt, Lori L.

176

Reduction of teeter angle excursions for a two-bladed downwind rotor using cyclic pitch control  

E-Print Network (OSTI)

Reduction of teeter angle excursions for a two-bladed downwind rotor using cyclic pitch control methods are based on cyclic pitch through the pitch servo system. The first method is based on a PI of the pitch regulated 5MW reference turbine used in the IEA Annex 23 benchmark. KEYWORDS: TWO-BLADED WIND

177

THE NEUROSCIENCES AND MUSIC III--DISORDERS AND PLASTICITY Automatic Brain Responses to Pitch Changes  

E-Print Network (OSTI)

THE NEUROSCIENCES AND MUSIC III--DISORDERS AND PLASTICITY Automatic Brain Responses to Pitch Montr´eal, Qu´ebec, Canada Congenital amusia is a lifelong disorder affecting the processing of pitch. This pitch deficit can be traced down to abnormal brain responses elicited by pitch changes smaller than

178

ABSOLUTE PITCH-BOTH A CURSE AND A BLESSING DANIELJ.L EVITIN  

E-Print Network (OSTI)

ABSOLUTE PITCH-BOTH A CURSE AND A BLESSING DANIELJ.L EVITIN Absolute pitch is not a medi cal erstandin g of this discomfort and its proper perspective, it is useful to define what absolut e pitch is, demarcate what it is not, and explore its possible origin s. Absolute pitch is generally defined

Levitin, Daniel

179

THE NEUROSCIENCES AND MUSIC III--DISORDERS AND PLASTICITY Impaired Memory for Pitch  

E-Print Network (OSTI)

THE NEUROSCIENCES AND MUSIC III--DISORDERS AND PLASTICITY Impaired Memory for Pitch in Congenital examined memory for pitch in congenital amusia in two tasks. In one task, we varied the pitch distance interpolated tones between the tones to be compared. In a second task, we manipulated the number of pitches

180

Circuit Models of Nonlinear Inhibition The silicon models of auditory localization and pitch perception, presented  

E-Print Network (OSTI)

and pitch perception, presented in Chapters 4 and 5, use inhibitory processing to improve the selectivity

Lazzaro, John

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

DIFFERENTIAL EFFECTS OF STIMULUS VARIABILITY AND LEARNERS' PRE-EXISTING PITCH PERCEPTION ABILITY IN  

E-Print Network (OSTI)

DIFFERENTIAL EFFECTS OF STIMULUS VARIABILITY AND LEARNERS' PRE-EXISTING PITCH PERCEPTION ABILITY). Subjects' pre-training ability to identify the pitch patterns in a non-lexical context was also measured. Subjects with high pitch-identification ability learned more successfully than those with lower pitch

Gabrieli, John

182

Graphene-sulfur nanocomposites for rechargeable lithium-sulfur battery electrodes  

SciTech Connect

Rechargeable lithium-sulfur batteries having a cathode that includes a graphene-sulfur nanocomposite can exhibit improved characteristics. The graphene-sulfur nanocomposite can be characterized by graphene sheets with particles of sulfur adsorbed to the graphene sheets. The sulfur particles have an average diameter less than 50 nm..

Liu, Jun; Lemmon, John P; Yang, Zhenguo; Cao, Yuiliang; Li, Xiaolin

2014-06-17T23:59:59.000Z

183

Hydrogen Storage Technologies Hydrogen Delivery  

E-Print Network (OSTI)

Hydrogen Storage Technologies Roadmap Hydrogen Delivery Technical Team Roadmap June 2013 #12;This.................................................................................. 13 6. Hydrogen Storage). The Hydrogen Delivery Technical Team is one of 12 U.S. DRIVE technical teams ("tech teams") whose mission

184

Sulfur minimization in bacterial leaching  

SciTech Connect

The production of sewage biosolids in Ontario in 1989 was estimated to be 7 million m{sup 3} of wet sludge per year. Of this amount, land application accounts for between 20 and 30% of the total. Unfortunately, the use of sewage biosolids on agricultural land is often prohibited because of heavy metal contamination of the biosolids. High cost and operational problems have made chemical methods of metal extraction unattractive. Consequently, microbiological methods of leaching of heavy metals have been studied for over a decade. A relatively simple microbiological process has been investigated in recent years in flask level experiments and recently in a semicontinuous system. The process exploits nonacidophilic and acidophilic indigenous thiobacilli to extract heavy metals from sewage biosolids. These thiobacilli use elemental sulfur as the energy source, producing sulfuric acid. However, the resulting decontaminated biosolids can cause environmental problems like acidification of the soil, when acid is generated from the residual sulfur in the biosolids. The present study examines the possibility of reducing the amount of sulfur added in batch and semicontinuous bacterial leaching systems, and maximizing sulfur oxidation efficiency, thereby reducing the residual sulfur in leached biosolids.

Seth, R.; Prasad, D.; Henry, J.G. [Univ. of Toronto, Ontario (Canada). Dept. of Civil Engineering

1996-11-01T23:59:59.000Z

185

Hydrogen Delivery  

NLE Websites -- All DOE Office Websites (Extended Search)

Mark Paster Energy Efficiency and Renewable Energy Hydrogen, Fuel Cells and Infrastructure Technology Program Hydrogen Production and Delivery Team Hydrogen Delivery Goal Hydrogen Delivery Goal Liquid H 2 & Chem. Carriers Gaseous Pipeline Truck Hydrides Liquid H 2 - Truck - Rail Other Carriers Onsite reforming Develop Develop hydrogen fuel hydrogen fuel delivery delivery technologies that technologies that enable the introduction and enable the introduction and long long - - term viability of term viability of hydrogen as an energy hydrogen as an energy carrier for transportation carrier for transportation and stationary power. and stationary power. Delivery Options * End Game - Pipelines - Other as needed * Breakthrough Hydrogen Carriers * Truck: HP Gas & Liquid Hydrogen

186

Effect of some isothiocyanates on the hydrogenation of canola oil  

SciTech Connect

Sulfur compounds were added to refined and bleached canola oil before hydrogenation in the form of allyl, heptyl and 2-phenethyl isothiocyanates, and the effects on hydrogenation rate, solid fat content and percentage trans fatty acids were determined. The poisoning effect was most pronounced with allyl isothiocyanate and least phenethyl isothiocyanate. As the amount of added sulfur increased, the hydrogenation rate decreased. Of the three isothiocyanates used, allyl isothiocyanate caused formation of larger amounts of trans isomers. An increased sulfur level in the oil resulted in increased solid fat content and trans isomer level. Allyl isothiocyanate also caused formation of larger amounts of solid fat than other isothiocyanates at all levels of sulfur addition. (Refs. 24).

Abraham, V.; de Man, J.M.

1987-06-01T23:59:59.000Z

187

HYBRID SULFUR RECOVERY PROCESS FOR NATURAL GAS UPGRADING  

SciTech Connect

This second quarter report of 2002 describes progress on a project funded by the U.S. Department of Energy (DOE) to test a hybrid sulfur recovery process for natural gas upgrading. The process concept represents a low cost option for direct treatment of natural gas streams to remove H{sub 2}S in quantities equivalent to 0.2-25 metric tons (LT) of sulfur per day. This process is projected to have lower capital and operating costs than the competing technologies, amine/aqueous iron liquid redox and amine/Claus/tail gas treating, and have a smaller plant footprint, making it well suited to both on-shore and offshore applications. CrystaSulf (service mark of CrystaTech, Inc.) is a new nonaqueous sulfur recovery process that removes hydrogen sulfide (H{sub 2}S) from gas streams and converts it into elemental sulfur. CrystaSulf features high sulfur recovery similar to aqueous-iron liquid redox sulfur recovery processes, but differs from the aqueous processes in that CrystaSulf controls the location where elemental sulfur particles are formed. In the hybrid process, approximately 1/3 of the total H{sub 2}S in the natural gas is first oxidized to SO{sub 2} at low temperatures over a heterogeneous catalyst. Low temperature oxidation is done so that the H{sub 2}S can be oxidized in the presence of methane and other hydrocarbons without oxidation of the hydrocarbons. The project involves the development of a catalyst using laboratory/bench-scale catalyst testing, and then demonstration of the catalyst at CrystaTech's pilot plant in west Texas. Previous reports described development of a catalyst with the required selectivity and efficiency for producing sulfur dioxide from H{sub 2}S. In the laboratory, the catalyst was shown to be robust and stable in the presence of several intentionally added contaminants, including condensate from the pilot plant site. This report describes testing using the laboratory apparatus but operated at the pilot plant using the actual pilot plant gas, which contains far more contaminants than can be simulated in the laboratory. The results are very encouraging, with stable and efficient operation being obtained for a prolonged period of time.

Girish Srinivas; Steven C. Gebhard; David W. DeBerry

2002-07-01T23:59:59.000Z

188

Hydrogen’s Potential  

Science Journals Connector (OSTI)

Estimates of future demand for non-fossil produced hydrogen and of its potential are oriented toward ... to the environment as the present fossil energy economy [10.4, 10.9].

J. Nitsch; C. Voigt

1988-01-01T23:59:59.000Z

189

Sulfur capture in combination bark boilers  

SciTech Connect

A review of sulfur dioxide emission data for eight combination bark boilers in conjunction with the sulfur contents of the fuels reveals significant sulfur capture ranging from 10% to over 80% within the solid ash phase. Wood ash characteristics similar to activated carbon as well as the significant wood ash alkali oxide and carbonate fractions are believed responsible for the sulfur capture. Sulfur emissions from combination bark-fossil fuel firing are correlated to the sulfur input per ton of bark or wood residue fired.

Someshwar, A.V.; Jain, A.K. (National Council of the Paper Industry for Air and Stream Improvement, Gainesville, FL (United States))

1993-07-01T23:59:59.000Z

190

Method of making sulfur-resistant composite metal membranes  

DOE Patents (OSTI)

The invention provides thin, hydrogen-permeable, sulfur-resistant membranes formed from palladium or palladium-alloy coatings on porous, ceramic or metal supports. Also disclosed are methods of making these membranes via sequential electroless plating techniques, wherein the method of making the membrane includes decomposing any organic ligands present on the substrate, reducing the palladium crystallites on the substrate to reduced palladium crystallites, depositing a film of palladium metal on the substrate and then depositing a second, gold film on the palladium film. These two metal films are then annealed at a temperature between about 200.degree. C. and about 1200.degree. C. to form a sulfur-resistant, composite PdAu alloy membrane.

Way, J. Douglas (Boulder, CO) [Boulder, CO; Lusk, Mark (Golden, CO) [Golden, CO; Thoen, Paul (Littleton, CO) [Littleton, CO

2012-01-24T23:59:59.000Z

191

The use of ethanol to remove sulfur from coal. Final report, September 1991--December 1992; Revision  

SciTech Connect

The initial technical goal in the project was to develop a chemical method for the cost effective removal of both inorganic and organic sulfur from Ohio coals. Verifying and using a process of reacting ethanol vapors with coal under conditions disclosed in U.S. Patent 4,888,029, the immediate technical objectives were to convert a small scale laborative batch process to a larger scale continuous process which can serve as the basis for commercial development of the technology. This involved getting as much information as possible from small scale batch autoclave or fluid bed laboratory reactors for use in pilot plant studies. The laboratory data included material balances on the coal and sulfur, temperature and pressure ranges for the reaction, minimum reaction times at different conditions, the effectiveness of different activators such as oxygen and nitric oxide, the amount and nature of by-products such as sulfur dioxide, hydrogen sulfide and acetaldehyde, the effect of coal particle size on the speed and completeness of the reaction, and the effectiveness of the reaction on different Ohio coals. Because the laboratory experiments using the method disclosed in U.S. 4,888,029 were not successful, the objective for the project was changed to develop a new laboratory process to use ethanol to remove sulfur from coal. Using copper as a catalyst and as an H{sub 2}S scavenger, a new laboratory procedure to use ethanol to remove sulfur from coal has been developed at Ohio University and a patent application covering this process was filed in March, 1993. The process is based on the use of copper as a catalyst for the dehydrogenation of ethanol to produce nascent hydrogen to remove sulfur from the coal and the use of copper as a scavenger to capture the hydrogen sulfide formed from the sulfur removed from coal.

Savage, R.L.; Lazarov, L.K.; Prudich, M.E.; Lange, C.A.; Kumar, N.

1994-03-10T23:59:59.000Z

192

Multilayer sulfur-resistant composite metal membranes and methods of making and repairing the same  

DOE Patents (OSTI)

The invention relates to thin, hydrogen-permeable, sulfur-resistant membranes formed from multi-layers of palladium or palladium-alloy coatings on porous, ceramic or metal supports, methods of making these membranes, methods of repairing layers of these membranes and devices that incorporate these membranes.

Way, J. Douglas; Hatlevik, Oyvind

2014-07-15T23:59:59.000Z

193

Transport Properties and Performance of Polymer Electrolyte Membranes for the Hybrid Sulfur Electrolyzer  

E-Print Network (OSTI)

not consume fossil fuels or pro- duce CO2 while producing highly pure hydrogen.1-10 Gaseous SO2 fedTransport Properties and Performance of Polymer Electrolyte Membranes for the Hybrid Sulfur and Biological Systems Department, Albuquerque, New Mexico 87123, USA c Department of Materials Science

Weidner, John W.

194

Process for tertiary oil recovery using tall oil pitch  

DOE Patents (OSTI)

A process and compositions for enhancing the recovery of acid crudes are disclosed. The process involves injecting caustic solutions into the reservoir to maintain a pH of 11 to 13. The fluid contains an effective amount of multivalent cation for inhibiting alkaline silica dissolution with the reservoir. A tall oil pitch soap is added as a polymeric mobility control agent. (DMC)

Radke, C.J.

1983-07-25T23:59:59.000Z

195

Pitch then power: limitations to acceleration in quadrupeds  

Science Journals Connector (OSTI)

...al. 2009)-hence the feet are drawn directly beneath...determine whether, and when, power or pitch-avoidance might...denotes distance from foot to greater trochanter...a,b) or fore (c) foot position and assuming...achieved, consistent with a power constraint. Body-mass...

2009-01-01T23:59:59.000Z

196

Resolution Studies on Silicon Strip Sensors with fine Pitch  

E-Print Network (OSTI)

In June 2008 single-sided silicon strip sensors with 50 $\\mu$m readout pitch were tested in a highly energetic pion beam at the SPS at CERN. The purpose of the test was to evaluate characteristic detector properties by varying the strip width and the number of intermediate strips. The experimental setup and first results for the spatial resolution are discussed.

S. Haensel; T. Bergauer; Z. Dolezal; M. Dragicevic; Z. Drasal; M. Friedl; J. Hrubec; C. Irmler; W. Kiesenhofer; M. Krammer; P. Kvasnicka

2009-01-30T23:59:59.000Z

197

Lummus process turns coal tar pitch to coke  

Science Journals Connector (OSTI)

Lummus Co. has developed a process for converting coal tar pitch to coke and now has a full-scale commercial plant in operation in Japan. The plant, which is owned by Nittetsu Chemical Industrial Co., a subsidiary of Yawata Iron and Steel, is producing ...

1968-12-09T23:59:59.000Z

198

Wind Turbine Pitch Angle Controllers for Grid Frequency Stabilisation  

E-Print Network (OSTI)

Laboratory Wind Energy Department P.O. Box 49 DK-4000 Roskilde, Denmark clemens.jauch@risoe.dk Abstract in Norway [4]. For the purpose of this research work the power system model has been extended with a windWind Turbine Pitch Angle Controllers for Grid Frequency Stabilisation Clemens Jauch Risø National

199

Hydrogen sensor  

DOE Patents (OSTI)

A hydrogen sensor for detecting/quantitating hydrogen and hydrogen isotopes includes a sampling line and a microplasma generator that excites hydrogen from a gas sample and produces light emission from excited hydrogen. A power supply provides power to the microplasma generator, and a spectrometer generates an emission spectrum from the light emission. A programmable computer is adapted for determining whether or not the gas sample includes hydrogen, and for quantitating the amount of hydrogen and/or hydrogen isotopes are present in the gas sample.

Duan, Yixiang (Los Alamos, NM); Jia, Quanxi (Los Alamos, NM); Cao, Wenqing (Katy, TX)

2010-11-23T23:59:59.000Z

200

Nuclear Hydrogen  

NLE Websites -- All DOE Office Websites (Extended Search)

Error Error Nuclear Hydrogen - RCC cannot be displayed due to a timeout error. We recommend: * Refresh Nuclear Hydrogen - RCC * Increasing your portlet timeout setting. *...

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Molecular Structures of Polymer/Sulfur Composites for Lithium...  

NLE Websites -- All DOE Office Websites (Extended Search)

Structures of PolymerSulfur Composites for Lithium-Sulfur Batteries with Long Cycle Life. Molecular Structures of PolymerSulfur Composites for Lithium-Sulfur Batteries with Long...

202

Relation between the characteristics of the pitches produced on the basis of heavy gas-oil of catalytic cracking  

SciTech Connect

Mesophase pitches are often used to produce carbon fibers. Results of microanalysis and fiber-forming ability of the pitches are described. The pitches were obtained by the catalytic cracking of heavy gas-oil.

Nikolaeva, L.V.; Bulanova, V.V. [Rossiiskaya Akadeiya, Nauk (Russian Federation)

1995-12-31T23:59:59.000Z

203

Printability and inspectability of Defects on the EUV Mask for sub32nm Half Pitch HVM Application  

E-Print Network (OSTI)

strategies for 32-nm half-pitch and beyond", Proc. o f SPIEEUV Mask for sub32nm Half Pitch H V M Application Sungminof phase defect as half pitch, scanner condition and mask

Huh, S.

2012-01-01T23:59:59.000Z

204

A relationship for the evaluation o coking values of coal tar pitches from their physical characteristics  

Science Journals Connector (OSTI)

A relationship has been proposed to evaluate the coking values of coal tar pitches from the knowledge of their ... It has been tried on 44 self-prepared coal tar pitches and 18 others obtained from ... -ranging c...

G. Bhatia; R. K. Aggarwal; O. P. Bahl

1987-11-01T23:59:59.000Z

205

Spatiotemporal representation of the pitch of harmonic complex tones in auditory nerve  

E-Print Network (OSTI)

The pitch of harmonic complex tones plays an important role in speech and music perception and the analysis of auditory scenes, yet traditional rate–place and temporal models for pitch processing provide only an incomplete ...

Cedolin, Leonardo

206

Pitch angle scattering and synchrotron radiation of relativistic runaway electrons in tokamak stochastic magnetic fields  

E-Print Network (OSTI)

Pitch angle scattering and synchrotron radiation of relativistic runaway electrons in tokamak is of a very different nature leading to a pitch angle scattering process which, under proper conditions, may

Martín-Solís, José Ramón

207

E-Print Network 3.0 - al-on-glass pitch adapter Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

on-glass pitch adapter Search Powered by Explorit Topic List Advanced Search Sample search results for: al-on-glass pitch adapter Page: << < 1 2 3 4 5 > >> 1 Computational...

208

Amylopectin Wrapped Graphene Oxide/Sulfur for Improved Cyclability of Lithium–Sulfur Battery  

Science Journals Connector (OSTI)

Amylopectin Wrapped Graphene Oxide/Sulfur for Improved Cyclability of Lithium–Sulfur Battery ... An amylopectin wrapped graphene oxide-sulfur composite was prepared to construct a 3-dimensionally cross-linked structure through the interaction between amylopectin and graphene oxide, for stabilizing lithium sulfur batteries. ...

Weidong Zhou; Hao Chen; Yingchao Yu; Deli Wang; Zhiming Cui; Francis J. DiSalvo; Héctor D. Abruña

2013-09-05T23:59:59.000Z

209

Sulfur: its clinical and toxicologic aspects  

Science Journals Connector (OSTI)

Although there is no known dietary requirement for inorganic sulfur, it is an essential element for all animal species in as much as they all require the sulfur-containing amino acid methionine. There are three predominate forms of organic sulfur in animals and humans: 1) the thiomethyl of methionine residues in protein; 2) the sulfhydryl disulfides of protein; and 3) the compounds containing ester or amide bound sulfates of glycosaminoglycans, steroids, and many xenobiotic metabolites. Thus, sulfur becomes an important constituent of amino acids, proteins, enzymes, vitamins and other biomolecules. Unlike mammalian species, plants can use inorganic sulfur and synthesize methionine from which are synthesized all the other important sulfur compounds. Hence, sulfur deficiency occurs mainly when plants are grown in sulfur-depleted soils and when humans and animals consume low-protein diets. In recent times, however, the increasing prevalence of refining petroleum and smelting sulfur compounds of metallic minerals into free metals are having a large impact on the balance of sulfur in the environment. Sulfur toxicity is associated mainly with high levels of the element and its toxic volatile substances in the environment. Sulfur dioxide (SO2), a major air pollutant, may adversely affect animal and human health by causing bronchitis, bronchoconstriction, and increased pulmonary resistance.

Lioudmila A Komarnisky; Robert J Christopherson; Tapan K Basu

2003-01-01T23:59:59.000Z

210

Two stage sorption of sulfur compounds  

DOE Patents (OSTI)

A two stage method for reducing the sulfur content of exhaust gases is disclosed. Alkali- or alkaline-earth-based sorbent is totally or partially vaporized and introduced into a sulfur-containing gas stream. The activated sorbent can be introduced in the reaction zone or the exhaust gases of a combustor or a gasifier. High efficiencies of sulfur removal can be achieved.

Moore, William E. (Manassas, VA)

1992-01-01T23:59:59.000Z

211

Hydrogen & Fuel Cells - Hydrogen - Hydrogen Quality  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydrogen Quality Issues for Fuel Cell Vehicles Hydrogen Quality Issues for Fuel Cell Vehicles Introduction Developing and implementing fuel quality specifications for hydrogen are prerequisites to the widespread deployment of hydrogen-fueled fuel cell vehicles. Several organizations are addressing this fuel quality issue, including the International Standards Organization (ISO), the Society of Automotive Engineers (SAE), the California Fuel Cell Partnership (CaFCP), and the New Energy and Industrial Technology Development Organization (NEDO)/Japan Automobile Research Institute (JARI). All of their activities, however, have focused on the deleterious effects of specific contaminants on the automotive fuel cell or on-board hydrogen storage systems. While it is possible for the energy industry to provide extremely pure hydrogen, such hydrogen could entail excessive costs. The objective of our task is to develop a process whereby the hydrogen quality requirements may be determined based on life-cycle costs of the complete hydrogen fuel cell vehicle "system." To accomplish this objective, the influence of different contaminants and their concentrations in fuel hydrogen on the life-cycle costs of hydrogen production, purification, use in fuel cells, and hydrogen analysis and quality verification are being assessed.

212

Micro Pitch and Vary Speed for Extreme Value Search MPPT Method of DFIG  

Science Journals Connector (OSTI)

Base on the analysis the mathematical model of the doubly-fed wind turbine and the maximum wind power tracking (MPPT) principle, pointed out the pitch deformation error will affect the effect of MPPT, put forward a new method base on micro pitch and ... Keywords: micro pitch, extreme value Search, flexible object, deformation error, MPPT

Deng Youhan; Cheng Yuanchu

2012-11-01T23:59:59.000Z

213

Effects of Culture on Musical Pitch Perception Patrick C. M. Wong1,2  

E-Print Network (OSTI)

Effects of Culture on Musical Pitch Perception Patrick C. M. Wong1,2 *, Valter Ciocca3 , Alice H. D--the influence of linguistic background on music pitch processing and disorders--remains elusive. Because languages differ in their usage of elements (e.g., pitch) that are also essential for music, a unique

214

Spatially resolved lasers using a glassy cholesteric liquid crystal film with lateral pitch gradient  

E-Print Network (OSTI)

Spatially resolved lasers using a glassy cholesteric liquid crystal film with lateral pitch crystal CLC lasers, a lateral pitch gradient was introduced by thermally activated diffusion across efficiencies, 0.2%­1.5%, are superior to those reported to date for gradient-pitch CLC lasers. © 2011 American

Chen, Shaw H.

215

Mini-Review Neural Mechanisms for the Abstraction and Use of Pitch  

E-Print Network (OSTI)

Mini-Review Neural Mechanisms for the Abstraction and Use of Pitch Information in Auditory Cortex provided an important complement to human studies of pitch perception by revealing how the activity that the acoustical parameters associ- ated with pitch are represented by the spiking responses of neurons in A1

Wang, Xiaoqin

216

Ideas Solving Social & Economic Challenges IUPUI Student Idea Pitch Competition 2014  

E-Print Network (OSTI)

Ideas Solving Social & Economic Challenges (ISSEC) IUPUI Student Idea Pitch Competition 2014,500 3rd Place: $500 PLUS: $1000 AWARD FOR "AUDIENCE CHOICE" ISSEC is an "elevator" pitch competition your pitch skills. (Note, you will be asked to login using your university sign-in credentials). https

Zhou, Yaoqi

217

PROOF COPY 002805JAS Pitch strength decreases as F0 and harmonic resolution  

E-Print Network (OSTI)

PROOF COPY 002805JAS PROOF COPY 002805JAS Pitch strength decreases as F0 and harmonic resolution 4 February 2008; accepted 7 February 2008 A melodic pitch experiment was performed to demonstrate the importance of time-interval resolution for pitch strength. The experiments show that notes with a low

Cambridge, University of

218

NEURAL PLASTICITY VOLUME 6, NO. 4, 1999 Temporal Coding of Periodicity Pitch in the  

E-Print Network (OSTI)

NEURAL PLASTICITY VOLUME 6, NO. 4, 1999 Temporal Coding of Periodicity Pitch in the Auditory System for pitch and timbre in the auditory nerve and cochlear nucleus. Neural pulse codes can be divided single Type I auditory nerve fibers. Features in such distri- butions correspond closely with pitches

Cariani, Peter

219

Dichotic Pitch: A new stimulus distinguishes normal and dyslexic auditory function  

E-Print Network (OSTI)

Dichotic Pitch: A new stimulus distinguishes normal and dyslexic auditory function Robert F pitch detection in dyslexia Corresponding author: Deborah E. Giaschi Department of Ophthalmology, room A acoustic white noise can be binaurally fused by the human auditory system to extract pitch and location

Dougherty, Bob

220

A nonmusical paradigm for identifying absolute pitch possessors David A. Rossa)  

E-Print Network (OSTI)

A nonmusical paradigm for identifying absolute pitch possessors David A. Rossa) Department. The etiology and defining characteristics of this skill, absolute pitch AP , have been very controversial. One literature in pitch memory, a paradigm is presented that is intended to distinguish between AP possessors

Olson, Ingrid

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

High-speed infrared phase modulators using short helical pitch ferroelectric liquid crystals  

E-Print Network (OSTI)

High-speed infrared phase modulators using short helical pitch ferroelectric liquid crystals Ju short helical pitch material and homeotropic alignment structure. This device is driven by periodic in of a thin layer of a ferroelectric liquid crystal with a small pitch and high spontaneous polarization

Wu, Shin-Tson

222

Fabrication of 5 nm linewidth and 14 nm pitch features by nanoimprint lithography  

E-Print Network (OSTI)

Fabrication of 5 nm linewidth and 14 nm pitch features by nanoimprint lithography Michael D. Austin pitch and feature sizes of these applications. Thus, presently, re- searchers have been largely pitch over a large area, its applications in nanogap metal contacts, and a study of fabrication yields

223

Fine-grained pitch processing of music and speech in congenital amusia  

E-Print Network (OSTI)

Fine-grained pitch processing of music and speech in congenital amusia Barbara Tillmanna) CNRS, UMR is a lifelong disorder of music processing that has been ascribed to impaired pitch perception and memory. The present study tested a large group of amusics (n ¼ 17) and pro- vided evidence that their pitch deficit

224

An acoustical study of vocal pitch matching in congenital Sean Hutchinsa  

E-Print Network (OSTI)

An acoustical study of vocal pitch matching in congenital amusia Sean Hutchinsa International November 2009; accepted 10 November 2009 Vocal pitch matching is a foundational skill for singing and is an interesting place to study the relationship between pitch perception and production. To better understand

225

Pitch discrimination without awareness in congenital amusia: Evidence from event-related potentials  

E-Print Network (OSTI)

Pitch discrimination without awareness in congenital amusia: Evidence from event-related potentials history: Accepted 14 January 2013 Keywords: Congenital amusia Pitch perception Auditory ERPs a b s t r a c in fine-grained pitch discrimination, and is expressed by the absence of a P3b event-related brain

226

The effects of humming and pitch on craniofacial and craniocervical morphology measured using MRI  

E-Print Network (OSTI)

The effects of humming and pitch on craniofacial and craniocervical morphology measured using MRI, pitch-related contributions are inseparable from those due to articulator input. In humming, articulator input is negligible. Using MRI we test the hypothesis that voice production is accompanied by pitch

Levi, Ran

227

Pitch angle scattering of an energetic magnetized particle by a circularly polarized electromagnetic wave  

E-Print Network (OSTI)

Pitch angle scattering of an energetic magnetized particle by a circularly polarized://pop.aip.org/features/most_downloaded Information for Authors: http://pop.aip.org/authors #12;Pitch angle scattering of an energetic magnetized valley, but for finite mismatch, there can be two valleys separated by a hill. A large pitch angle

Bellan, Paul M.

228

2005 Nature Publishing Group The neuronal representation of pitch in primate  

E-Print Network (OSTI)

© 2005 Nature Publishing Group The neuronal representation of pitch in primate auditory cortex Daniel Bendor1 & Xiaoqin Wang1 Pitch perception is critical for identifying and segregating audi- tory objects1 , especially in the context of music and speech. The perception of pitch is not unique to humans

Wang, Xiaoqin

229

Brief Communications Finding the Pitch of the Missing Fundamental in Infants  

E-Print Network (OSTI)

Brief Communications Finding the Pitch of the Missing Fundamental in Infants Chao He1 and Laurel J, Ontario M6A 3E1, Canada Pitch perception is critical for the perception of speech and music, for object in the environment from the complex sound wave that reaches the ears. The perceived pitch of a complex sound

Trainor, Laurel J.

230

Direct Detection of Resonant Electron Pitch Angle Scattering by Whistler Waves in a Laboratory Plasma  

E-Print Network (OSTI)

Direct Detection of Resonant Electron Pitch Angle Scattering by Whistler Waves in a Laboratory on the first laboratory experiment to directly detect resonant pitch angle scattering of energetic (ke or less, making it difficult to detect changes in electron pitch angle. A review of observations

California at Los Angles, University of

231

Pitch angle distribution analysis of radiation belt electrons based on Combined Release and Radiation Effects Satellite  

E-Print Network (OSTI)

Pitch angle distribution analysis of radiation belt electrons based on Combined Release of pitch angle distributions (PADs) of energetic electrons is performed. The distributions are classified a is the local pitch angle, a profile of the parameter n versus L-shell is produced for local times corresponding

Li, Xinlin

232

Online Recognition of Music Is Influenced by Relative and Absolute Pitch Information  

E-Print Network (OSTI)

Online Recognition of Music Is Influenced by Relative and Absolute Pitch Information Sarah C. Creel to assess what types of pitch information adults use in recognition. Fixation and error data suggest recognition rapidly. Further, adults use both absolute and relative pitch information in recognition

Gentner, Timothy

233

A PITCH TARGET APPROXIMATION MODEL FOR F0 CONTOURS IN Ching X. Xu*  

E-Print Network (OSTI)

A PITCH TARGET APPROXIMATION MODEL FOR F0 CONTOURS IN MANDARIN Ching X. Xu* , Yi Xu* , and Li. The model assumes that a) the basic units underlying Mandarin tones are pitch targets that are either static or dynamic, b) each pitch target is assigned to and implemented in synchrony with a syllable, and c

Luo, Li-Shi

234

Ris-R-1500(EN) Control design for a pitch-regulated, vari-  

E-Print Network (OSTI)

Risø-R-1500(EN) Control design for a pitch-regulated, vari- able speed wind turbine Morten H Laboratory Roskilde Denmark January 2005 #12;Author: Title: Control design for a pitch-regulated, variable speed and power through the collective blade pitch angle and generator moment. The aeroelastic

235

ON DYNAMICAL SYSTEM THEORY APPLICATION TO EARTH-SATELLITE PITCH AUTHOR: Emmanuel Osei-Frimpong -KNUST  

E-Print Network (OSTI)

ON DYNAMICAL SYSTEM THEORY APPLICATION TO EARTH-SATELLITE PITCH AUTHOR: Emmanuel Osei the dynamics of Pitch Attitude librations of an orbiting earth-satellite is discussed. This highly non linear equation of motion of the Pitch Attitude librations is transformed into a system of equations in terms

Assani, Idris

236

Sulfur Dioxide Crossover during the Production of Hydrogen and Sulfuric Acid in a PEM Electrolyzer  

E-Print Network (OSTI)

and must be resup- plied. For example, researchers at the Savannah River National Laboratory SRNL have

Weidner, John W.

237

CHARACTERIZATION OF COAL- AND PETROLEUM-DERIVED BINDER PITCHES AND THE INTERACTION OF PITCH/COKE MIXTURES IN PRE-BAKED CARBON ANODES.  

E-Print Network (OSTI)

??Carbon anodes are manufactured from calcined petroleum coke (i.e. sponge coke) and recycled anode butts as fillers, and coal tar pitch (SCTP) as the binder.… (more)

Suriyapraphadilok, Uthaiporn

2008-01-01T23:59:59.000Z

238

The use of ethanol to remove sulfur from coal. Final report, September 1991--December 1992  

SciTech Connect

In developing the new Ohio University procedure the thermodynamic limitations of the reactions for removal of both pyritic and organic sulfur from coal at 400--600{degrees}C were studied using copper as a very strong H{sub 2}S-acceptor. Copper serves as a catalyst for ethanol dehydrogenation to form nascent hydrogen. Copper also serves as a scavenger to form copper sulfide from the hydrogen sulfide evolved during the reaction. Copper sulfide in turn serves as a catalyst for organic sulfur hydrodesulfurization reactions. If the coal to be desulfurized contains pyrite (FeS{sub 2}) or FeS, the copper scavenger effect reduces any back reaction of hydrogen sulfide with the iron and increases the removal of sulfur from the carbonaceous material. The desired effect of using copper can be achieved by using copper or copper containing alloys as materials of construction or as liners for a regenerable reactor. During the time period that Ohio Coal Development Office supported this work, small scale (560 grams) laboratory experiments with coals containing about 3.5% sulfur have achieved up to 90% desulfurization at temperatures of 500{degrees}C when using a copper reactor. Results from the autoclave experiments have identified the nature of the chemical reactions taking place. Because the process removes both pyritic and organic sulfur in coal, the successful scale up of the process would have important economic significance to the coal industry. Even though this and other chemical processes may be relatively expensive and far from being commercial, the reason for further development is that this process may hold the promise of achieving much greater sulfur reduction and of producing a cleaner coal than other methods. This would be especially important for small or older power plants and industrial boilers.

Not Available

1993-04-15T23:59:59.000Z

239

Pitch-Controlled Variable-Speed Wind Turbine Generation  

NLE Websites -- All DOE Office Websites (Extended Search)

Pitch-Controlled Variable-Speed Pitch-Controlled Variable-Speed Wind Turbine Generation February 2000 * NREL/CP-500-27143 E. Muljadi and C.P. Butterfield Presented at the 1999 IEEE Industry Applications Society Annual Meeting Phoenix, Arizona October 3-7, 1999 National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401-3393 NREL is a U.S. Department of Energy Laboratory Operated by Midwest Research Institute * * * * Battelle * * * * Bechtel Contract No. DE-AC36-99-GO10337 NOTICE The submitted manuscript has been offered by an employee of the Midwest Research Institute (MRI), a contractor of the US Government under Contract No. DE-AC36-99GO10337. Accordingly, the US Government and MRI retain a nonexclusive royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for US Government purposes.

240

Pitch-angle scattering of energetic particles with adiabatic focusing  

E-Print Network (OSTI)

Understanding turbulent transport of charged particles in magnetized plasmas often requires a model for the description of random variations in the particle's pitch angle. The Fokker-Planck coefficient of pitch-angle scattering, which is used to describe scattering parallel to the mean magnetic field, is therefore of central importance. Whereas quasi-linear theory assumes a homogeneous mean magnetic field, such a condition is often not fulfilled, especially for high-energy particles. Here, a new derivation of the quasi-linear approach is given that is based on the unperturbed orbit found for an adiabatically focused mean magnetic field. The results show that, depending on the ratio of the focusing length and the particle's Larmor radius, the Fokker-Planck coefficient is significantly modified but agrees with the classical expression in the limit of a homogeneous mean magnetic field.

Tautz, R C; Dosch, A

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Design principles for Bernal spirals and helices with tunable pitch  

E-Print Network (OSTI)

Using the framework of potential energy landscape theory, we describe two in silico designs for self-assembling helical colloidal superstructures based upon dipolar dumbbells and Janus-type building blocks, respectively. Helical superstructures with controllable pitch length are obtained using external magnetic field driven assembly of asymmetric dumbbells involving screened electrostatic as well as magnetic dipolar interactions. The pitch of the helix is tuned by modulating the Debye screening length over an experimentally accessible range. The second design is based on building blocks composed of rigidly linked spheres with short-range anisotropic interactions, which are predicted to self-assemble into Bernal spirals. These spirals are quite flexible, and longer helices undergo rearrangements via cooperative, hinge-like moves, in agreement with experiment.

Szilard N. Fejer; Dwaipayan Chakrabarti; Halim Kusumaatmaja; David J. Wales

2014-07-07T23:59:59.000Z

242

Acoustic and biological studies of pitched blade mixing systems  

E-Print Network (OSTI)

of blade construction on coalesence. Van't Riet also showed the dependence of power consumption on vessel geometry, hold up, bubble size, and the number of impeller blades present. Warmoeskerken et s. l (51 described gas loading regimes of the pitched... also be obtained with Fourier transforms. Strasberg reviewed sound emissions from: 1) bubble formation at a nozzle; 2) bubble coalescence and splitting; 3) bubble flow past bodies and constrictions; and 4) rising bubbles; all of which may have...

Hsi, Randolph Paul

1986-01-01T23:59:59.000Z

243

THE EFFECT OF ANOLYTE PRODUCT ACID CONCENTRATION ON HYBRID SULFUR CYCLE PERFORMANCE  

SciTech Connect

The Hybrid Sulfur (HyS) cycle (Fig. 1) is one of the simplest, all-fluids thermochemical cycles that has been devised for splitting water with a high-temperature nuclear or solar heat source. It was originally patented by Brecher and Wu in 1975 and extensively developed by Westinghouse in the late 1970s and early 1980s. As its name suggests, the only element used besides hydrogen and oxygen is sulfur, which is cycled between the +4 and +6 oxidation states. HyS comprises two steps. One is the thermochemical (>800 C) decomposition of sulfuric acid (H{sub 2}SO{sub 4}) to sulfur dioxide (SO{sub 2}), oxygen (O{sub 2}), and water. H{sub 2}SO{sub 4} = SO{sub 2} + 1/2 O{sub 2} + H{sub 2}O. The other is the SO{sub 2}-depolarized electrolysis of water to H{sub 2}SO{sub 4} and hydrogen (H{sub 2}), SO{sub 2} + 2 H{sub 2}O = H{sub 2}SO{sub 4} + H{sub 2}, E{sup o} = -0.156 V, explaining the 'hybrid' designation. These two steps taken together split water into H{sub 2} and O{sub 2} using heat and electricity. Researchers at the Savannah River National Laboratory (SRNL) and at the University of South Carolina (USC) have successfully demonstrated the use of proton exchange membrane (PEM) electrolyzers (Fig. 2) for the SO{sub 2}-depolarized electrolysis (sulfur oxidation) step, while Sandia National Laboratories (SNL) successfully demonstrated the high-temperature sulfuric acid decomposition (sulfur reduction) step using a bayonet-type reactor (Fig. 3). This latter work was performed as part of the Sulfur-Iodine (SI) cycle Integrated Laboratory Scale demonstration at General Atomics (GA). The combination of these two operations results in a simple process that will be more efficient and cost-effective for the massive production of hydrogen than alkaline electrolysis. Recent developments suggest that the use of PEMs other than Nafion will allow sulfuric acid to be produced at higher concentrations (>60 wt%), offering the possibility of net thermal efficiencies around 50% (HHV basis). The effect of operation at higher anolyte concentrations on the flowsheet, and on the net thermal efficiency for a nuclear-heated HyS process, is examined and quantified.

Gorensek, M.; Summers, W.

2010-03-24T23:59:59.000Z

244

Liquid Hydrogen Delivery - Strategic Directions for Hydrogen...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Liquid Hydrogen Delivery - Strategic Directions for Hydrogen Delivery Workshop Liquid Hydrogen Delivery - Strategic Directions for Hydrogen Delivery Workshop Targets, barriers and...

245

Hydrogen production by the decomposition of water  

DOE Patents (OSTI)

How to produce hydrogen from water was a problem addressed by this invention. The solution employs a combined electrolytical-thermochemical sulfuric acid process. Additionally, high purity sulfuric acid can be produced in the process. Water and SO.sub.2 react in electrolyzer (12) so that hydrogen is produced at the cathode and sulfuric acid is produced at the anode. Then the sulfuric acid is reacted with a particular compound M.sub.r X.sub.s so as to form at least one water insoluble sulfate and at least one water insoluble oxide of molybdenum, tungsten, or boron. Water is removed by filtration; and the sulfate is decomposed in the presence of the oxide in sulfate decomposition zone (21), thus forming SO.sub.3 and reforming M.sub.r X.sub.s. The M.sub.r X.sub.s is recycled to sulfate formation zone (16). If desired, the SO.sub.3 can be decomposed to SO.sub.2 and O.sub.2 ; and the SO.sub.2 can be recycled to electrolyzer (12) to provide a cycle for producing hydrogen.

Hollabaugh, Charles M. (Los Alamos, NM); Bowman, Melvin G. (Los Alamos, NM)

1981-01-01T23:59:59.000Z

246

The complete genome sequence of Staphylothermus marinus reveals differences in sulfur metabolism among heterotrophic Crenarchaeota  

SciTech Connect

Staphylothermus marinus is an anaerobic, sulfur-reducing peptide fermenter of the archaeal phylum Crenarchaeota. It is the third heterotrophic, obligate sulfur reducing crenarchaeote to be sequenced and provides an opportunity for comparative analysis of the three genomes. The 1.57 Mbp genome of the hyperthermophilic crenarchaeote Staphylothermus marinus has been completely sequenced. The main energy generating pathways likely involve 2-oxoacid:ferredoxin oxidoreductases and ADP-forming acetyl-CoA synthases. S. marinus possesses several enzymes not present in other crenarchaeotes including a sodium ion-translocating decarboxylase likely to be involved in amino acid degradation. S. marinus lacks sulfur-reducing enzymes present in the other two sulfur-reducing crenarchaeotes that have been sequenced - Thermofilum pendens and Hyperthermus butylicus. Instead it has three operons similar to the mbh and mbx operons of Pyrococcus furiosus, which may play a role in sulfur reduction and/or hydrogen production. The two marine organisms, S. marinus and H. butylicus, possess more sodium-dependent transporters than T. pendens and use symporters for potassium uptake while T. pendens uses an ATP-dependent potassium transporter. T. pendens has adapted to a nutrient-rich environment while H. butylicus is adapted to a nutrient-poor environment, and S. marinus lies between these two extremes. The three heterotrophic sulfur-reducing crenarchaeotes have adapted to their habitats, terrestrial vs. marine, via their transporter content, and they have also adapted to environments with differing levels of nutrients. Despite the fact that they all use sulfur as an electron acceptor, they are likely to have different pathways for sulfur reduction.

Anderson, iain J.; Dharmarajan, Lakshmi; Rodriguez, Jason; Hooper, Sean; Porat, Iris; Ulrich, Luke E.; Elkins, James G.; Mavromatis, Kostas; Sun, Hui; Land, Miriam; Lapidus, Alla; Lucas, Susan; Barry, Kerrie; Huber, Harald; Zhulin, Igor B.; Whitman, William B.; Mukhopadhyay, Biswarup; Woese, Carl; Bristow, James; Kyrpides, Nikos

2008-09-05T23:59:59.000Z

247

A Silicon Model of Pitch Perception Many people can sing, in key, in unison with a melody. Perceiving the  

E-Print Network (OSTI)

102 Chapter 5 A Silicon Model of Pitch Perception Many people can sing, in key, in unison with a melody. Perceiving the pitch of a sound is an essential part of this task. The diversity of sounds that evoke a distinct pitch indicates the complexity of human pitch perception. We perceive a pure sinusoid

Lazzaro, John

248

Pitch strength decreases as F0 and harmonic resolution increase in complex tones composed exclusively of high  

E-Print Network (OSTI)

Pitch strength decreases as F0 and harmonic resolution increase in complex tones composed A melodic pitch experiment was performed to demonstrate the importance of time-interval resolution for pitch. INTRODUCTION A series of experiments with filtered click trains and harmonic complexes has shown that pitch

Ives, D. Timothy

249

Hydrogen Analysis  

Energy.gov (U.S. Department of Energy (DOE))

Presentation on Hydrogen Analysis to the DOE Systems Analysis Workshop held in Washington, D.C. July 28-29, 2004 to discuss and define role of systems analysis in DOE Hydrogen Program.

250

Hydrogen Storage  

Energy.gov (U.S. Department of Energy (DOE))

On-board hydrogen storage for transportation applications continues to be one of the most technically challenging barriers to the widespread commercialization of hydrogen-fueled vehicles. The EERE...

251

Hydrogen Safety  

Fuel Cell Technologies Publication and Product Library (EERE)

This 2-page fact sheet, intended for a non-technical audience, explains the basic properties of hydrogen and provides an overview of issues related to the safe use of hydrogen as an energy carrier.

252

Hydrogen Cryomagnetics  

E-Print Network (OSTI)

% cryogenics (inc. MRI) 29% pressurisation and purging 11%controlled atmospheres (inc. breathing) 6% 4     Figure 5. Simplified price-cost, supply-demand relationship that is central to the helium market model developed during the Helium Resources... of hydrogen large amounts of hydrogen must be available for liquefaction. This poses problems for the production of liquid hydrogen via intermittent wind energy and via microwave plasma reactors that are not scalable as a result of low hydrogen production...

Glowacki, B. A.; Hanely, E.; Nuttall, W. J.

2014-01-01T23:59:59.000Z

253

Carbon/Sulfur Nanocomposites and Additives for High-Energy Lithium...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

CarbonSulfur Nanocomposites and Additives for High-Energy Lithium Sulfur Batteries CarbonSulfur Nanocomposites and Additives for High-Energy Lithium Sulfur Batteries 2011 DOE...

254

Improve reformer operation with trace sulfur removal  

SciTech Connect

Modern bimetallic reforming catalysts typically have feed specifications for sulfur of 0.5 to 1 wppm in the reformer naphtha carge. Sulfur in the raw naphtha is reduced to this level by naphtha hydrotreating. While most naphtha hydrotreating operations can usually obtain these levels without substantial problems. It is difficult to obtain levels much below 0.5 to 1 wppm with this process. Revamp of a constrained existing hydrotreater to reduce product sulfur slightly can be extremely costly typically entailing replacement or addition of a new reactor. At Engelhard the authors demonstrated that if the last traces of sulfur remaining from hydrotreating can be removed, the resulting ultra-low sulfur feed greatly improves the reformer operation and provides substantial economic benefit to the refiner. Removal of the remaining trace sulfur is accomplished in a simple manner with a special adsorbent bed, without adding complexity to the reforming operation.

McClung, R.G.; Novak, W.J.

1987-01-01T23:59:59.000Z

255

Heat treatment of medium-temperature Sasol–Lurgi gasifier coal-tar pitch for polymerizing to higher value products  

Science Journals Connector (OSTI)

Two coal-derived pitch samples, one a medium temperature pitch from a Sasol–Lurgi gasifier and the other from a high temperature coking process, have been heat treated to induce polymerization, both separately and as a mixture of pitches (co-pyrolysis). The initial pitch samples and the heat-treated samples have been examined by size exclusion chromatography (SEC) in 1-methyl-2-pyrrolidinone (NMP), by UV-fluorescence spectroscopy (UV-F), by solid state 13C NMR; elemental analyses of the initial pitch samples have been carried out. The Sasol–Lurgi pitch showed larger apparent sizes, more alkyl and carbonyl functions, and smaller polycyclic aromatic hydrocarbon (PAH) groups than the high temperature pitch. Co-pyrolysis of the two pitches indicated that polymerized product from the Sasol–Lurgi pitch can be used as an extender for high-temperature binder pitch.

K. Mokoena; T.J. Van der Walt; T.J. Morgan; A.A. Herod; R. Kandiyoti

2008-01-01T23:59:59.000Z

256

Contribution of isotopologue self-shielding to sulfur mass-independent fractionation during sulfur dioxide photolysis  

E-Print Network (OSTI)

Signatures of sulfur mass-independent fractionation (S-MIF) are observed for sulfur minerals in Archean rocks, and for modern stratospheric sulfate aerosols (SSA) deposited in polar ice. Ultraviolet light photolysis of ...

Lyons, J. R.

257

HYDROCARBON AND SULFUR SENSORS FOR SOFC SYSTEMS  

SciTech Connect

The following report summarizes work conducted during the Phase I program Hydrocarbon and Sulfur Sensors for SOFC Systems under contract No. DE-FC26-02NT41576. For the SOFC application, sensors are required to monitor hydrocarbons and sulfur in order to increase the operation life of SOFC components. This report discusses the development of two such sensors, one based on thick film approach for sulfur monitoring and the second galvanic based for hydrocarbon monitoring.

A.M. Azad; Chris Holt; Todd Lesousky; Scott Swartz

2003-11-01T23:59:59.000Z

258

Electrochemical separation and concentration of sulfur containing gases from gas mixtures  

DOE Patents (OSTI)

A method of removing sulfur oxides of H.sub.2 S from high temperature gas mixtures (150.degree.-1000.degree. C.) is the subject of the present invention. An electrochemical cell is employed. The cell is provided with inert electrodes and an electrolyte which will provide anions compatible with the sulfur containing anions formed at the anode. The electrolyte is also selected to provide inert stable cations at the temperatures encountered. The gas mixture is passed by the cathode where the sulfur gases are converted to SO.sub.4.sup.= or, in the case of H.sub.2 S, to S.sup.=. The anions migrate to the anode where they are converted to a stable gaseous form at much greater concentration levels (>10X). Current flow may be effected by utilizing an external source of electrical energy or by passing a reducing gas such as hydrogen past the anode.

Winnick, Jack (3805 Woodrail-on-the-Green, Columbia, MO 65201)

1981-01-01T23:59:59.000Z

259

Computational Study of Sulfur–nickel Interactions: A New S–Ni Phase Diagram  

SciTech Connect

Prediction of the interactions between H2S-contaminated hydrogen fuel and Ni surfaces under conditions similar to those for solid oxide fuel cell (SOFC) operation using DFT (density function theory) calculations (with thermodynamic corrections) has resulted in a new S–Ni phase diagram, which suggests the existence of an intermediate state between clean Ni surfaces and nickel sulfides – sulfur atoms adsorbed on Ni surfaces. This prediction is consistent with many experimental observations relevant to sulfur poisoning of Nibased anodes in SOFCs, which cannot be explained using the existing S–Ni bulk phase diagram from classical thermodynamics. The accurate prediction of the adsorption phase is vital to a fundamental understanding of the sulfur poisoning mechanism of Ni-based anodes under SOFC operating conditions.

Wang, Jeng-Han; Liu, Meilin

2007-06-22T23:59:59.000Z

260

Hydrogen-Bonding Interaction in Molecular Complexes and Clusters of Aerosol Nucleation Alexei Khalizov, and Renyi Zhang*  

E-Print Network (OSTI)

Hydrogen-Bonding Interaction in Molecular Complexes and Clusters of Aerosol Nucleation Precursors, water, and ammonia. A central feature of the complexes is the presence of two hydrogen bonds. Organic acid-sulfuric acid complexes show one strong and one medium-strength hydrogen bond whereas

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Engineering for Sustainability http://engineering.tufts.edu/ Nanoscale Gold Catalysts for the Upgrade of Hydrogen used in Fuel Cells  

E-Print Network (OSTI)

for the Upgrade of Hydrogen used in Fuel Cells What is the problem? Fuel processing by steam reforming or partial oxidation is presently used to produce a hydrogen-rich gas stream to feed the low- temperature PEM fuel cells. Impurities, such as carbon monoxide and sulfur, must be removed from the hydrogen stream

Tufts University

262

Microfluidic Hydrogen Fuel Cell with a Liquid Electrolyte Ranga S. Jayashree, Michael Mitchell, Dilip Natarajan, Larry J. Markoski, and  

E-Print Network (OSTI)

Letters Microfluidic Hydrogen Fuel Cell with a Liquid Electrolyte Ranga S. Jayashree, Michael and characterization of a microfluidic hydrogen fuel cell with a flowing sulfuric acid solution instead of a Nafion membrane as the electrolyte. We studied the effect of cell resistance, hydrogen and oxygen flow rates

Kenis, Paul J. A.

263

Sulfurization of a carbon surface for vapor phase mercury removal II: Sulfur forms and mercury uptake  

E-Print Network (OSTI)

promote the formation of organic sulfur and the presence of H2S during the cooling process increased in the presence of H2S was very effective towards Hg uptake in nitrogen. Corre- lation of mercury uptake capacitySulfurization of a carbon surface for vapor phase mercury removal ­ II: Sulfur forms and mercury

Borguet, Eric

264

Hydrogenation apparatus  

DOE Patents (OSTI)

Hydrogenation reaction apparatus is described comprising a housing having walls which define a reaction zone and conduits for introducing streams of hydrogen and oxygen into the reaction zone, the oxygen being introduced into a central portion of the hydrogen stream to maintain a boundary layer of hydrogen along the walls of the reaction zone. A portion of the hydrogen and all of the oxygen react to produce a heated gas stream having a temperature within the range of from 1,100 to 1,900 C, while the boundary layer of hydrogen maintains the wall temperature at a substantially lower temperature. The heated gas stream is introduced into a hydrogenation reaction zone and provides the source of heat and hydrogen for a hydrogenation reaction. There also is provided means for quenching the products of the hydrogenation reaction. The present invention is particularly suitable for the hydrogenation of low-value solid carbonaceous materials to provide high yields of more valuable liquid and gaseous products. 2 figs.

Friedman, J.; Oberg, C. L.; Russell, L. H.

1981-06-23T23:59:59.000Z

265

Graded pitch electromagnetic pump for thin strip metal casting systems  

DOE Patents (OSTI)

A metal strip casing system is provided with an electromagnetic pump which includes a pair of primary blocks having a graded pole pitch, polyphase ac winding and being arranged on opposite sides of a movable heat sink. A nozzle is provided for depositing liquid metal on the heat sink such that the resulting metal strip and heat sink combination is subjected to a longitudinal electromagnetic field which increases in wavelength in the direction of travel of the heat sink, thereby subjecting the metal and heat sink to a longitudinal force having a magnitude which increases in the direction of travel. 4 figs.

Kuznetsov, S.B.

1986-04-01T23:59:59.000Z

266

Graphene-wrapped sulfur nanospheres with ultra-high sulfur loading for high energy density lithium–sulfur batteries  

Science Journals Connector (OSTI)

Abstract Lithium–sulfur (Li–S) battery with high theoretical energy density is one of the most promising energy storage systems for electric vehicles and intermittent renewable energy. However, due to the poor conductivity of the active material, considerable weight of the electrode is occupied by the conductive additives. Here we report a graphene-wrapped sulfur nanospheres composite (S-nanosphere@G) with sulfur content up to 91 wt% as the high energy density cathode material for Li–S battery. The sulfur nanospheres with diameter of 400–500 nm are synthesized through a solution-based approach with the existence of polyvinylpyrrolidone (PVP). Then the sulfur nanospheres are uniformly wrapped by conductive graphene sheets through the electrostatic interaction between graphene oxide and PVP, followed by reducing of graphene oxide with hydrazine. The design of graphene wrapped sulfur nanoarchitecture provides flexible conductive graphene coating with void space to accommodate the volume expansion of sulfur and to minimize polysulfide dissolution. As a result, the S-nanosphere@G nanocomposite with 91 wt% sulfur shows a reversible initial capacity of 970 mA h g?1 and an average columbic efficiency > 96% over 100 cycles at a rate of 0.2 C. Taking the total mass of electrode into account, the S-nanosphere@G composite is a promising cathode material for high energy density Li–S batteries.

Ya Liu; Jinxin Guo; Jun Zhang; Qingmei Su; Gaohui Du

2015-01-01T23:59:59.000Z

267

HYBRID SULFUR RECOVERY PROCESS FOR NATURAL GAS UPGRADING  

SciTech Connect

This final report describes the objectives, technical approach, results and conclusions for a project funded by the U.S. Department of Energy to test a hybrid sulfur recovery process for natural gas upgrading. The process concept is a configuration of CrystaTech, Inc.'s CrystaSulf{reg_sign} process which utilizes a direct oxidation catalyst upstream of the absorber tower to oxidize a portion of the inlet hydrogen sulfide (H{sub 2}S) to sulfur dioxide (SO{sub 2}) and elemental sulfur. This hybrid configuration of CrystaSulf has been named CrystaSulf-DO and represents a low-cost option for direct treatment of natural gas streams to remove H{sub 2}S in quantities equivalent to 0.2-25 metric tons (LT) of sulfur per day and more. This hybrid process is projected to have lower capital and operating costs than the competing technologies, amine/aqueous iron liquid redox and amine/Claus/tail gas treating, and have a smaller plant footprint, making it well suited to both onshore and offshore applications. CrystaSulf is a nonaqueous sulfur recovery process that removes H{sub 2}S from gas streams and converts it to elemental sulfur. In CrystaSulf, H{sub 2}S in the inlet gas is reacted with SO{sub 2} to make elemental sulfur according to the liquid phase Claus reaction: 2H{sub 2}S + SO{sub 2} {yields} 2H{sub 2}O + 3S. The SO{sub 2} for the reaction can be supplied from external sources by purchasing liquid SO{sub 2} and injecting it into the CrystaSulf solution, or produced internally by converting a portion of the inlet gas H{sub 2}S to SO{sub 2} or by burning a portion of the sulfur produced to make SO{sub 2}. CrystaSulf features high sulfur recovery similar to aqueous-iron liquid redox sulfur recovery processes, but differs from the aqueous processes in that CrystaSulf controls the location where elemental sulfur particles are formed. In the hybrid process, the needed SO{sub 2} is produced by placing a bed of direct oxidation catalyst in the inlet gas stream to oxidize a portion of the inlet H{sub 2}S. Oxidation catalysts may also produce some elemental sulfur under these conditions, which can be removed and recovered prior to the CrystaSulf absorber. The CrystaSulf-DO process can utilize direct oxidation catalyst from many sources. Numerous direct oxidation catalysts are available from many suppliers worldwide. They have been used for H{sub 2}S oxidation to sulfur and/or SO{sub 2} for decades. It was believed at the outset of the project that TDA Research, Inc., a subcontractor, could develop a direct oxidation catalyst that would offer advantages over other commercially available catalysts for this CrystaSulf-DO process application. This project involved the development of several of TDA's candidate proprietary direct oxidation catalysts through laboratory bench-scale testing. These catalysts were shown to be effective for conversion of H{sub 2}S to SO{sub 2} and to elemental sulfur under certain operating conditions. One of these catalysts was subsequently tested on a commercial gas stream in a bench-scale reactor at CrystaTech's pilot plant site in west Texas with good results. However, commercial developments have precluded the use of TDA catalysts in the CrystaSulf-DO process. Nonetheless, this project has advanced direct oxidation catalyst technology for H{sub 2}S control in energy industries and led to several viable paths to commercialization. TDA is commercializing the use of its direct oxidation catalyst technology in conjunction with the SulfaTreat{reg_sign} solid scavenger for natural gas applications and in conjunction with ConocoPhillips and DOE for gasification applications using ConocoPhillips gasification technology. CrystaTech is commercializing its CrystaSulf-DO process in conjunction with Gas Technology Institute for natural gas applications (using direct oxidation catalysts from other commercial sources) and in conjunction with ChevronTexaco and DOE for gasification applications using ChevronTexaco's gasification technology.

Dennis Dalrymple

2004-06-01T23:59:59.000Z

268

The behavior of the pitch angle of spiral arms depending on optical wavelength  

E-Print Network (OSTI)

Based on integral field spectroscopy data from the CALIFA survey, we investigate the possible dependence of spiral arm pitch angle with optical wavelength. For three of the five studied objects, the pitch angle gradually increases at longer wavelengths. This is not the case for two objects where the pitch angle remains constant. This result is confirmed by the analysis of SDSS data. We discuss the possible physical mechanisms to explain this phenomenon, as well as the implications of the results.

Martínez-García, Eric E; Rosales-Ortega, F F; González-Lópezlira, Rosa A; Fuentes-Carrera, Isaura; Luna, A

2014-01-01T23:59:59.000Z

269

The effects of gas-to-oil rate in ultra low sulfur diesel hydrotreating  

Science Journals Connector (OSTI)

Hydrotreating has become a critical refining process as fuel sulfur specifications are tightened around the world. Recently, refiners in the United States have been learning how to optimize the performance of ultra low sulfur diesel (ulsd) hydrotreaters. The gas-to-oil feed rate ratio is known to be an important variable in this respect. It is well known that the gas-to-oil rate must be kept high enough to maintain the desired hydrogen partial pressure through the hydrotreating reactor, and to minimize the inhibiting effect of hydrogen sulfide. A lesser-known effect is the effect of gas-to-oil rate on the vapor–liquid equilibrium in the reactor. Changing the gas-to-oil rate alters the distribution of reactants between vapor and liquid in a way that changes the relative reaction rates of different sulfur compounds. This paper presents some pilot plant data and analysis showing this effect of phase equilibrium in deep diesel desulfurization. The effect can be modeled using the Frye–Mosby equation, which accounts for the effects of feed vaporization and phase equilibrium on the reaction rates of individual sulfur compounds in a trickle bed hydrotreater.

George Hoekstra

2007-01-01T23:59:59.000Z

270

How the pitch of a holey optical fiber affects its lightguide properties  

Science Journals Connector (OSTI)

This paper discusses how scaling (increasing) the transverse dimensions of a holey optical quartz fiber affects its lightguide properties. It is established that a limiting pitch...

Dukel'skii, K V; Kondrat'ev, Yu N; Komarov, A V; Ter-Nersesyants, E V; Khokhlov, A V; Shevandin, V S

2006-01-01T23:59:59.000Z

271

Singing with yourself: Evidence for an inverse modeling account of poor-pitch singing  

Science Journals Connector (OSTI)

Abstract Singing is a ubiquitous and culturally significant activity that humans engage in from an early age. Nevertheless, some individuals – termed poor-pitch singers – are unable to match target pitches within a musical semitone while singing. In the experiments reported here, we tested whether poor-pitch singing deficits would be reduced when individuals imitate recordings of themselves as opposed to recordings of other individuals. This prediction was based on the hypothesis that poor-pitch singers have not developed an abstract “inverse model” of the auditory–vocal system and instead must rely on sensorimotor associations that they have experienced directly, which is true for sequences an individual has already produced. In three experiments, participants, both accurate and poor-pitch singers, were better able to imitate sung recordings of themselves than sung recordings of other singers. However, this self-advantage was enhanced for poor-pitch singers. These effects were not a byproduct of self-recognition (Experiment 1), vocal timbre (Experiment 2), or the absolute pitch of target recordings (i.e., the advantage remains when recordings are transposed, Experiment 3). Results support the conceptualization of poor-pitch singing as an imitative deficit resulting from a deficient inverse model of the auditory–vocal system with respect to pitch.

Peter Q. Pfordresher; James T. Mantell

2014-01-01T23:59:59.000Z

272

High-Sulfur Coal for Generating Electricity  

Science Journals Connector (OSTI)

High-Sulfur...FLUIDIZED-BED COMBUSTORS, COMBUSTION...MAY FLUE GAS DES S E...1971 ). High-sulfur...was brief. Natural gas became...overdependent on natural gas and oil to...elevated pressure with a downward...coals of high ash-fusion...

James T. Dunham; Carl Rampacek; T. A. Henrie

1974-04-19T23:59:59.000Z

273

Process for alternately steam reforming sulfur containing hydrocarbons that vary in oxygen content  

SciTech Connect

In the hydrotreating and steam reforming of an oxygen and sulfur bearing hydrocarbon fuel, the oxygen is first removed in an oxidizer containing a bed of platinum catalyst, the inlet temperature being well below 1000/sup 0/F and preferably on the order of 300/sup 0/F. The sulfur in the fuel does not harm the oxidizer catalyst and may be removed downstream by known hydrodesulfurization techniques prior to reforming. A process is described for removing oxygen from an oxygen and sulfur bearing hydrocarbon fuel, such as peak shared natural gas, upstream in the process so that sulfur can be removed later. The fuel and some hydrogen are introduced into an oxidizer at a temperature of 350/sup 0/F or less down to the minimum ignition temperature. The oxidizer consists of a platinum bed catalyst which catalyzes the oxidation of the oxygen to water with accompanying heat release to raise the exit gas temperature to less than 650/sup 0/F. The temperature desorbs the sulfur from the catalyst, and the exit gases are passed downstream to nickel subsulfide or molybdenum desfulfide catalysts where the hydrosulfurization process takes place. (BLM)

Lesieur, R.R.; Setzer, H.J.; Hawkins, J.R.

1980-01-01T23:59:59.000Z

274

Method of removal of sulfur from coal and petroleum products  

DOE Patents (OSTI)

A method for the removal of sulfur from sulfur-bearing materials such as coal and petroleum products using organophosphine and organophosphite compounds is provided.

Verkade, John G. (Ames, IA); Mohan, Thyagarajan (Ames, IA); Angelici, Robert J. (Ames, IA)

1995-01-01T23:59:59.000Z

275

Investigation of Sulfur Deactivation on Cu/Zeolite SCR Catalysts...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

of Sulfur Deactivation on CuZeolite SCR Catalysts in Diesel Application Investigation of Sulfur Deactivation on CuZeolite SCR Catalysts in Diesel Application Investigation of...

276

Manipulating the Surface Reactions in Lithium Sulfur Batteries...  

NLE Websites -- All DOE Office Websites (Extended Search)

Manipulating the Surface Reactions in Lithium Sulfur Batteries Using Hybrid Anode Structures. Manipulating the Surface Reactions in Lithium Sulfur Batteries Using Hybrid Anode...

277

Band-tunable color cone lasing emission based on dye-doped cholesteric liquid crystals with various pitches and a pitch gradient  

Science Journals Connector (OSTI)

This study elucidates, for the first time, a novel band-tunable color cone lasing emission (CCLE) based on dye-doped cholesteric liquid crystal (DDCLC) films with various pitches....

Lee, C -R; Lin, S -H; Yeh, H -C; Ji, T -D

2009-01-01T23:59:59.000Z

278

Sulfur nanocrystals anchored graphene composite with highly improved electrochemical performance for lithium–sulfur batteries  

Science Journals Connector (OSTI)

Abstract Two kinds of graphene–sulfur composites with 50 wt% of sulfur are prepared using hydrothermal method and thermal mixing, respectively. Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray Spectra mapping show that sulfur nanocrystals with size of ?5 nm dispersed on graphene sheets homogeneously for the sample prepared by hydrothermal method (NanoS@G). While for the thermal mixed graphene–sulfur composite (S–G mixture), sulfur shows larger and uneven size (50–200 nm). X-ray Photoelectron Spectra (XPS) reveals the strong chemical bonding between the sulfur nanocrystals and graphene. Comparing with the S–G mixture, the NanoS@G composite shows highly improved electrochemical performance as cathode for lithium–sulfur (Li–S) battery. The NanoS@G composite delivers an initial capacity of 1400 mAh g?1 with the sulfur utilization of 83.7% at a current density of 335 mA g?1. The capacity keeps above 720 mAh g?1 over 100 cycles. The strong adherence of the sulfur nanocrystals on graphene immobilizes sulfur and polysulfides species and suppressed the “shuttle effect”, resulting higher coulombic efficiency and better capacity retention. Electrochemical impedance also suggests that the strong bonding enabled rapid electronic/ionic transport and improved electrochemical kinetics, therefore good rate capability is obtained. These results demonstrate that the NanoS@G composite is a very promising candidate for high-performance Li–S batteries.

Jun Zhang; Zimin Dong; Xiuli Wang; Xuyang Zhao; Jiangping Tu; Qingmei Su; Gaohui Du

2014-01-01T23:59:59.000Z

279

HYBRID SULFUR PROCESS REFERENCE DESIGN AND COST ANALYSIS  

SciTech Connect

This report documents a detailed study to determine the expected efficiency and product costs for producing hydrogen via water-splitting using energy from an advanced nuclear reactor. It was determined that the overall efficiency from nuclear heat to hydrogen is high, and the cost of hydrogen is competitive under a high energy cost scenario. It would require over 40% more nuclear energy to generate an equivalent amount of hydrogen using conventional water-cooled nuclear reactors combined with water electrolysis compared to the proposed plant design described herein. There is a great deal of interest worldwide in reducing dependence on fossil fuels, while also minimizing the impact of the energy sector on global climate change. One potential opportunity to contribute to this effort is to replace the use of fossil fuels for hydrogen production by the use of water-splitting powered by nuclear energy. Hydrogen production is required for fertilizer (e.g. ammonia) production, oil refining, synfuels production, and other important industrial applications. It is typically produced by reacting natural gas, naphtha or coal with steam, which consumes significant amounts of energy and produces carbon dioxide as a byproduct. In the future, hydrogen could also be used as a transportation fuel, replacing petroleum. New processes are being developed that would permit hydrogen to be produced from water using only heat or a combination of heat and electricity produced by advanced, high temperature nuclear reactors. The U.S. Department of Energy (DOE) is developing these processes under a program known as the Nuclear Hydrogen Initiative (NHI). The Republic of South Africa (RSA) also is interested in developing advanced high temperature nuclear reactors and related chemical processes that could produce hydrogen fuel via water-splitting. This report focuses on the analysis of a nuclear hydrogen production system that combines the Pebble Bed Modular Reactor (PBMR), under development by PBMR (Pty.) Ltd. in the RSA, with the Hybrid Sulfur (HyS) Process, under development by the Savannah River National Laboratory (SRNL) in the US as part of the NHI. This work was performed by SRNL, Westinghouse Electric Company, Shaw, PBMR (Pty) Ltd., and Technology Insights under a Technical Consulting Agreement (TCA). Westinghouse Electric, serving as the lead for the PBMR process heat application team, established a cost-shared TCA with SRNL to prepare an updated HyS thermochemical water-splitting process flowsheet, a nuclear hydrogen plant preconceptual design and a cost estimate, including the cost of hydrogen production. SRNL was funded by DOE under the NHI program, and the Westinghouse team was self-funded. The results of this work are presented in this Final Report. Appendices have been attached to provide a detailed source of information in order to document the work under the TCA contract.

Gorensek, M.; Summers, W.; Boltrunis, C.; Lahoda, E.; Allen, D.; Greyvenstein, R.

2009-05-12T23:59:59.000Z

280

Individual Pitch Control for Mitigation of Power Fluctuation of Variable Speed Wind Turbines  

E-Print Network (OSTI)

Individual Pitch Control for Mitigation of Power Fluctuation of Variable Speed Wind Turbines, China mcheng@seu.edu.cn Abstract-- Grid connected wind turbines are the sources of power fluctuations presents an individual pitch control (IPC) strategy to mitigate the wind turbine power fluctuation at both

Hu, Weihao

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Benefits of solvent extracted pitch in the densification of carbon-carbon composites  

SciTech Connect

As new commercial/industrial applications for carbon-carbon develop, it is necessary to adjust the matrix to the needs of the application, and reduce the cost of carbon-carbon. In addition, the environmental impact of current pitch production has resulted in the closing of coke ovens, and the loss of sources of raw material. To over come these problems, a new source of pitch is being developed utilizing a unique process involving the solvent extraction of coal. This process, developed at West Virginia University, has resulted in a number of pitch materials which are currently undergoing studies to determine the feasibility of their use in carbon-carbon composites. Work to date has centered on comparison of the microstructure of coked samples of the new pitches with those of currently used coal tar and petroleum pitches. Because of the ability to vary process parameters, it is possible to very closely replicate the microstructure of a typical carbon-carbon composites using solvent extracted pitch. Additional work will completely characterize the new materials to ensure they have similar properties as currently used pitches. Future work will alter and improve the properties of solvent extracted pitch to produce composites with special properties and at lower cost.

Baker, C.F. [Fiber Materials, Inc., Biddeford, ME (United States); Stiller, A.

1994-12-31T23:59:59.000Z

282

A Systemic Design Methodology of PM Generators for Fixed-Pitch Marine Current Turbines  

E-Print Network (OSTI)

A Systemic Design Methodology of PM Generators for Fixed-Pitch Marine Current Turbines Sofiane of permanent magnet (PM) generator associated with fixed-pitch turbine for tidal energy generation. The main problem with marine current turbines systems are the maintenance requirements of the drive

Paris-Sud XI, Université de

283

Reflectivity of cholesteric liquid crystals with spatially varying pitch  

E-Print Network (OSTI)

Solids with spatially varying photonic structure offer gaps to light of a wider range of frequencies than do simple photonic systems. We solve numerically the field distribution in a solid cholesteric with a linearly varying inverse pitch (helical wavevector) using equations we derive for the general case. The simple idea that the position where the Bragg condition is locally satisfied is where reflection takes place is only true in part. Here, reflection is due to a region where the waves are forced to become evanescent, and the rate of variation of structure determines over which distance the waves decay and therefore how complete reflection is. The approximate local Bragg-de Vries schemes are shown to break down in detail at the edges of the gap, and an analytical estimate is given for the transmission coefficient.

S. Kutter; M. Warner

2003-04-30T23:59:59.000Z

284

Catalyst for elemental sulfur recovery process  

DOE Patents (OSTI)

A catalytic reduction process is described for the direct recovery of elemental sulfur from various SO[sub 2]-containing industrial gas streams. The catalytic process provides high activity and selectivity, as well as stability in the reaction atmosphere, for the reduction of SO[sub 2] to elemental sulfur product with carbon monoxide or other reducing gases. The reaction of sulfur dioxide and reducing gas takes place over a metal oxide composite catalyst having one of the following empirical formulas: [(FO[sub 2])[sub 1[minus]n](RO)[sub n

Flytzani-Stephanopoulos, M.; Liu, W.

1995-01-24T23:59:59.000Z

285

America's Best Student Start-Up Companies Pitch for Your Vote | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Best Student Start-Up Companies Pitch for Your Vote Best Student Start-Up Companies Pitch for Your Vote America's Best Student Start-Up Companies Pitch for Your Vote May 24, 2012 - 9:03am Addthis After pitching their business plan to panels of judges at the regional semifinal and final, six teams advanced to the national competition for a chance at the cash grand prize. | Energy Department file graphic. After pitching their business plan to panels of judges at the regional semifinal and final, six teams advanced to the national competition for a chance at the cash grand prize. | Energy Department file graphic. Michael Hess Michael Hess Former Digital Communications Specialist, Office of Public Affairs How can I participate? You can select your favorite. UPDATE: Voting closed June 12 at 2 p.m. EDT. NuMat Technologies from

286

Sulfur-graphene oxide material for lithium-sulfur battery cathodes  

NLE Websites -- All DOE Office Websites (Extended Search)

Sulfur-graphene oxide material for lithium-sulfur battery cathodes Sulfur-graphene oxide material for lithium-sulfur battery cathodes Theoretical specific energy and theoretical energy density Scanning electron micrograph of the GO-S nanocomposite June 2013 Searching for a safer, less expensive alternative to today's lithium-ion batteries, scientists have turned to lithium-sulfur as a possible chemistry for next-generation batteries. Li/S batteries have several times the energy storage capacity of the best currently available rechargeable Li-ion battery, and sulfur is inexpensive and nontoxic. Current batteries using this chemistry, however, suffer from extremely short cycle life-they don't last through many charge-discharge cycles before they fail. A research team led by Elton Cairns and Yuegang Zhang has developed a new

287

The SEMATECH Berkeley MET: demonstration of 15-nm half-pitch in chemically amplified EUV resist and sensitivity of EUV resists at 6.x-nm  

E-Print Network (OSTI)

EUV develoment beyond 22-nm half pitch. Proc. of SPIE, 7636(learning to 16-nm half pitch. Proc. of SPIE 7969. 79690R(demonstration of 15-nm half-pitch in chemically ampli?ed EUV

Anderson, Christopher

2013-01-01T23:59:59.000Z

288

The SEMATECH Berkeley MET & DCT: a quest for 14-nm half-pitch in chemically amplified resist, OOB contrast of EUV resists, and 6.x-nm lithography  

E-Print Network (OSTI)

DCT: a quest for 14-nm half- pitch in chemically amplifiedimage approaching 12-nm half-pitch with contrast above 60%.nm down to 12-nm half pitch, using the pseudo-PSM technique.

McClinton, Brittany

2013-01-01T23:59:59.000Z

289

WPP, No. 108: Perception of pitch location within a speaker’s own range: fundamental frequency, voice quality and speaker sex  

E-Print Network (OSTI)

D. (2005). “Perception of pitch location within a speaker’spp. 113-140 Perception of pitch location within a speaker’sto identify whether the pitch of a brief isolated sample of

Bishop, Jason; Keating, Patricia

2010-01-01T23:59:59.000Z

290

Japanese pitch accent acquisition by learners of Japanese: Effects of training on Japanese accent instruction, perception, and production  

E-Print Network (OSTI)

This dissertation investigated 1) American L2 learners' perceptual ability to accurately identify Japanese pitch accent, and 2) learners' realization of Japanese pitch accent. This study was conducted to determine whether these abilities could...

Hirano-Cook, Erika

2011-07-13T23:59:59.000Z

291

Design and Synthesis of a Photoaromatization-Based Two-Stage Photobase Generator for Pitch Division Lithography  

E-Print Network (OSTI)

Design and Synthesis of a Photoaromatization-Based Two-Stage Photobase Generator for Pitch Division in such a resist has twice the pitch of the projected mask image. Unfortunately, when sub-100 nm features

Turro, Nicholas J.

292

Hydrogen & Fuel Cells - Hydrogen - Hydrogen Storage  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydrogen Storage Systems Modeling and Analysis Hydrogen Storage Systems Modeling and Analysis Several different approaches are being pursued to develop on-board hydrogen storage systems for light-duty vehicle applications. The different approaches have different characteristics, such as: the thermal energy and temperature of charge and discharge kinetics of the physical and chemical process steps involved requirements for the materials and energy interfaces between the storage system and the fuel supply system on one hand, and the fuel user on the other Other storage system design and operating parameters influence the projected system costs as well. Argonne researchers are developing thermodynamic, kinetic, and engineering models of the various hydrogen storage systems to understand the characteristics of storage systems based on these approaches and to evaluate their potential to meet the DOE targets for on-board applications. The DOE targets for 2015 include a system gravimetric capacity of 1.8 kWh/kg (5.5 wt%) and a system volumetric capacity of 1.3 kWh/L (40 g/L). We then use these models to identify significant component and performance issues, and evaluate alternative system configurations and design and operating parameters.

293

Phosphazene groups modified sulfur composites as active cathode materials for rechargeable lithium/sulfur batteries  

Science Journals Connector (OSTI)

A novel phosphazene groups modified sulfur composites cathode [triphosphazene sulfide composite (PS) or nitroaniline–triphosphazene disulfide composite (NPS)] which can give good affinity with electrolytes was...

J. D. Liu; S. Q. Zhang; S. B. Yang; Z. F. Shi; S. T. Zhang; L. K. Wu

2013-11-01T23:59:59.000Z

294

Energy Levels in Sulfur Nuclei  

Science Journals Connector (OSTI)

A study has been made of the proton groups from the reaction of 3.22-Mev deuterons with sulfur in the form, primarily, of H2S gas. The following Q values have been assigned to the reaction S32(dp)S33:6.48, 5.69, 4.58, 4.31, 3.63, 3.33, 2.60, 2.33, 2.06, 1.78, 1.37, 0.85, and 0.18 Mev, corresponding to the ground state and twelve excited states of S33. Four of these groups have been investigated for proton gamma-ray coincidences to confirm this assignment. The yield as a function of deuteron energy has been observed for the six highest energy groups and indication of the presence of some broad resonances found. A qualitative measurement of the variation with angle of relative yields of the groups has indicated a proton intensity distribution that is symmetric for some groups and asymmetric for others. The cross section for the reaction for 90° observation has been found to be 1.2 barns. The mass difference S33-S32 has been calculated to be 0.99963 mass unit.Two low intensity, high energy groups have been assigned to the reaction S33(dp)S34 with Q values of 8.67 and 7.85 Mev. This, together with the above observation, leads to a value of 1.99691 for the mass difference S34-S32.

Perry W. Davison

1949-03-01T23:59:59.000Z

295

Hydrogen Liquefaction  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Liquid Hydrogen is 0.2% Ortho, 99.8% Para 3 Liquid Supply North America 250+ TPD Capacity Diverse Feedstocks Chlor-Alkali SMR Petro-chem Market...

296

Hydrogen Storage  

Science Journals Connector (OSTI)

Hydrogen is an important energy carrier, and when used as a fuel, can be considered as an alternate to the major fossil fuels, coal, crude oil, and natural gas, and their derivatives. It has the potential to b...

Prof. Dr. Robert A. Huggins

2010-01-01T23:59:59.000Z

297

Hydrogen energy  

Science Journals Connector (OSTI)

...use of hydrogen as an energy carrier will depend significantly...its utilization and conversion to electricity/heat...becomes an alternative energy carrier. However, various...effectively with conventional energy conversion technologies. The...

2007-01-01T23:59:59.000Z

298

Hydrogen Production  

Fuel Cell Technologies Publication and Product Library (EERE)

This 2-page fact sheet provides a brief introduction to hydrogen production technologies. Intended for a non-technical audience, it explains how different resources and processes can be used to produ

299

The pitch of a mistuned harmonic: Evidence for a template Jian-Yu Lin and William M. Hartmann  

E-Print Network (OSTI)

The pitch of a mistuned harmonic: Evidence for a template model Jian-Yu Lin and William M. Hartmann as a separate entity if the harmonic is slightly mistuned from its correct frequency. Pitch matching experiments show that the pitch of such a mistuned harmonic differs systematically from its frequency. The shift

300

Early integration of vowel and pitch processing: A mismatch negativity study Pascale Lidji a,b,c,*, Pierre Jolicoeur a  

E-Print Network (OSTI)

Early integration of vowel and pitch processing: A mismatch negativity study Pascale Lidji a Keywords: MMN ERPs Pitch Vowel Phoneme Music P3a a b s t r a c t Objective: Several studies have explored of their fundamental components: pitch and phonemes. Here, we examined the additivity of the mismatch negativity (MMN

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Fabrication of large area 100 nm pitch grating by spatial frequency doubling and nanoimprint lithography for subwavelength  

E-Print Network (OSTI)

Fabrication of large area 100 nm pitch grating by spatial frequency doubling and nanoimprint nm pitch gratings over a large area 10 cm2 using a simple, low-cost, fast process. This method doubling and 2 pattern replication using nanoimprint lithography. The form birefringence of a 100 nm pitch

302

Neuropsychologia 46 (2008) 632639 Evidence for the role of the right auditory cortex in fine pitch resolution  

E-Print Network (OSTI)

Neuropsychologia 46 (2008) 632­639 Evidence for the role of the right auditory cortex in fine pitch September 2007 Abstract The neural basis of human pitch perception is not fully understood. It has been scanned while passively listening to pure-tone melodic-like sequences in which the pitch distance between

303

PUBLISHED ONLINE: 18 MAY 2014 | DOI: 10.1038/NPHYS2975 Mammalian pitch sensation shaped by the  

E-Print Network (OSTI)

ARTICLES PUBLISHED ONLINE: 18 MAY 2014 | DOI: 10.1038/NPHYS2975 Mammalian pitch sensation shaped by the cochlear fluid Florian Gomez and Ruedi Stoop* The perceived pitch of a complex harmonic sound changes to govern perceived pitch, but these rules are violated in psychoacoustic experiments. Cognitive cortical

Loss, Daniel

304

Pitch Elevation in Trangendered Patients: Anterior Glottic Web Formation Assisted by Temporary Injection Augmentation  

Science Journals Connector (OSTI)

Summary Pitch elevation surgery is most often indicated to assist male-to-female transgendered individuals seeking a more feminine voice quality. Behavioral therapy is primary management but if the desired voice quality is not achieved, surgery is offered. Procedures described that raise vocal pitch alter one or more of the main parameters known to physiologically control pitch; vocal fold tension, length, and mass. Objective Web formation with injection augmentation significantly raises vocal pitch in male-to-female transgendered individuals. Study Design Retrospective cohort study. This report describes the voice results after anterior web formation with injection augmentation to reduce vocal fold length in a series of 10 transgendered patients. Methods Retrospective review of male-to-female transgendered patients referred to St. Michaels Hospital Voice Clinic, Toronto, Canada for pitch elevation was carried out including demographic data, preoperative and postoperative acoustic data and videostroboscopic evaluation. Results Comparison between preoperative to postoperative acoustic measures demonstrated a mean increase in fundamental frequency of 110 Hz after web formation. Perturbation measures and pitch range were unchanged from before surgery to after surgery. Conclusion This novel modification for endoscopic anterior web formation has been shown to be a successful procedure for permanent elevation of pitch with little or no morbidity.

Jennifer A. Anderson

2014-01-01T23:59:59.000Z

305

Modular multimorphic kinematic arm structure and pitch and yaw joint for same  

DOE Patents (OSTI)

A multimorphic kinematic manipulator arm is provided with seven degrees of freedom and modular kinematic redundancy through identical pitch/yaw, shoulder, elbow and wrist joints and a wrist roll device at the wrist joint, which further provides to the manipulator arm an obstacle avoidance capability. The modular pitch/yaw joints are traction drive devices which provide backlash free operation with smooth torque transmission and enhanced rigidity. A dual input drive arrangement is provided for each joint resulting in a reduction of the load required to be assumed by each drive and providing selective pitch and yaw motions by control of the relative rotational directions of the input drive.

Martin, H. Lee (Knoxville, TN); Williams, Daniel M. (Oliver Springs, TN); Holt, W. Eugene (Knoxville, TN)

1989-01-01T23:59:59.000Z

306

SIMPLE FIT OF DATA RELATING SUPERMASSIVE BLACK HOLE MASS TO GALAXY PITCH ANGLE  

SciTech Connect

Seigar et al. have recently demonstrated a new, tight correlation between galactic central supermassive black hole (BH) mass and the pitch angle of the spiral arm in disk galaxies which they attribute to other indirect correlations. They fit a double power law, governed by five parameters, to the BH mass as a function of pitch. Noting the features of their fitted curve, we show that a simple linear proportion of the BH mass to the cotangent of the pitch angle can obtain the same fit, within error. Such a direct, elegant fit may help shed light on the nature of the correlation.

Ringermacher, Harry I. [General Electric Global Research Center, Schenectady, NY 12309 (United States); Mead, Lawrence R. [Department of Physics and Astronomy, University of Southern Mississippi, Hattiesburg, MS 39406 (United States)

2009-06-15T23:59:59.000Z

307

Degradation of solid oxide fuel cell metallic interconnects in fuels containing sulfur  

SciTech Connect

Hydrogen is the main fuel for all types of fuel cells except direct methanol fuel cells. Hydrogen can be generated from all manner of fossil fuels, including coal, natural gas, diesel, gasoline, other hydrocarbons, and oxygenates (e.g., methanol, ethanol, butanol, etc.). Impurities in the fuel can cause significant performance problems and sulfur, in particular, can decrease the cell performance of fuel cells, including solid oxide fuel cells (SOFC). In the SOFC, the high (800-1000°C) operating temperature yields advantages (e.g., internal fuel reforming) and disadvantages (e.g., material selection and degradation problems). Significant progress in reducing the operating temperature of the SOFC from ~1000 ºC to ~750 ºC may allow less expensive metallic materials to be used for interconnects and as balance of plant (BOP) materials. This paper provides insight on the material performance of nickel, ferritic steels, and nickel-based alloys in fuels containing sulfur, primarily in the form of H2S, and seeks to quantify the extent of possible degradation due to sulfur in the gas stream.

Ziomek-Moroz, M.; Hawk, Jeffrey A.

2005-01-01T23:59:59.000Z

308

ADVANCED HYDROGEN TRANSPORT MEMBRANES FOR VISION 21 FOSSIL FUEL PLANTS  

SciTech Connect

During this quarter work was continued on characterizing the stability of layered composite membranes under a variety of conditions. Membrane permeation was tested up to 100 hours at constant pressure, temperature, and flow rates. In addition, design parameters were completed for a scale-up hydrogen separation demonstration unit. Evaluation of microstructure and effect of hydrogen exposure on BCY/Ni cermet mechanical properties was initiated. The fabrication of new cermets containing high permeability metals is reported and progress in the preparation of sulfur resistant catalysts is discussed. Finally, a report entitled ''Criteria for Incorporating Eltron's Hydrogen Separation Membranes into Vision 21 IGCC Systems and FutureGen Plants'' was completed.

Carl R. Evenson; Anthony F. Sammells; Richard T. Treglio; Jim Fisher; U. Balachandran; Richard N. Kleiner; James E. Stephan; Frank E. Anderson; Chandra Ratnasamy; Mahendra Sunkara; Jyothish Thangla; Clive Brereton; Warren Wolfs; James Lockhart

2005-01-28T23:59:59.000Z

309

Hydrogen program overview  

SciTech Connect

This paper consists of viewgraphs which summarize the following: Hydrogen program structure; Goals for hydrogen production research; Goals for hydrogen storage and utilization research; Technology validation; DOE technology validation activities supporting hydrogen pathways; Near-term opportunities for hydrogen; Market for hydrogen; and List of solicitation awards. It is concluded that a full transition toward a hydrogen economy can begin in the next decade.

Gronich, S. [Dept. of Energy, Washington, DC (United States). Office of Utility Technologies

1997-12-31T23:59:59.000Z

310

Active Hydrogen  

Science Journals Connector (OSTI)

Dry hydrogen can be activated in an electric discharge if the pressure and voltage are carefully regulated. Active hydrogen reduces metallic sulphides whose heat of formation is 22 000 cal. or less. The active gas is decomposed by 3 cm of well packed glass wool. A quantitative method is given for the determination of active hydrogen. Less of the active gas is formed in a tube coated with stearic acid or phosphoric acid than when no coating is employed. The decay reaction was found to follow the expression for a unimolecular reaction. The rate of decay appears to be independent of the wall surface. The period of half?life at room temperature and 40 mm pressure is 0.2 sec. approximately. The energy of formation of active hydrogen is approximately 18 000 cal. The energy of activation for the decay of the active constituent is approximately 17 800 cal. The properties of active hydrogen are considered in relation to the properties predicted for H3.

A. C. Grubb; A. B. Van Cleave

1935-01-01T23:59:59.000Z

311

Carbon/Sulfur Nanocomposites and Additives for High-Energy Lithium...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

& Publications Additives and Cathode Materials for High-Energy Lithium Sulfur Batteries CarbonSulfur Nanocomposites and Additives for High-Energy Lithium Sulfur Batteries...

312

Electrochemical Hydrogen Compressor  

SciTech Connect

The Electrochemical Hydrogen Compressor EHC was evaluated against DOE applications for compressing hydrogen at automobile filling stations, in future hydrogen pipelines and as a commercial replacement for conventional diaphragm hydrogen compressors. It was also evaluated as a modular replacement for the compressors used in petrochemical refineries. If the EHC can be made inexpensive, reliable and long lived then it can satisfy all these applications save pipelines where the requirements for platinum catalyst exceeds the annual world production. The research performed did not completely investigate Molybdenum as a hydrogen anode or cathode, it did show that photoetched 316 stainless steel is inadequate for an EHC. It also showed that: molybdenum bipolar plates, photochemical etching processes, and Gortex Teflon seals are too costly for a commercial EHC. The use of carbon paper in combination with a perforated thin metal electrode demonstrated adequate anode support strength, but is suspect in promoting galvanic corrosion. The nature of the corrosion mechanisms are not well understood, but locally high potentials within the unit cell package are probably involved. The program produced a design with an extraordinary high cell pitch, and a very low part count. This is one of the promising aspects of the redesigned EHC. The development and successful demonstration of the hydraulic cathode is also important. The problem of corrosion resistant metal bipolar plates is vital to the development of an inexpensive, commercial PEM fuel cell. Our research suggests that there is more to the corrosion process in fuel cells and electrochemical compressors than simple, steady state, galvanic stability. It is an important area for scientific investigation. The experiments and analysis conducted lead to several recommended future research directions. First, we need a better understanding of the corrosion mechanisms involved. The diagnosis of experimental cells with titration to determine the loss of membrane active sites is recommended. We suspect that the corrosion includes more than simple galvanic mechanisms. The mechanisms involved in this phenomenon are poorly understood. Shunt currents at hydraulic cathode ports were problematic, but are not difficult to cure. In addition to corrosion there is evidence of high component resistivity. This may be due to the deposition of organic compounds, which may be produced electrochemically on the surface of the metal support screens that contact carbon gas diffusion layers (GDLs) or catalyst supports. An investigation of possible electro-organic sythesis mechanisms with emphasis on oxalates formation is warranted. The contaminated cell parts can be placed in an oxidizing atmosphere at high temperature and the weight loss can be observed. This would reveal the existence of organic compounds. Investigation into the effects of conductivity enhancers such as carbon microlayers on supporting carbon paper is also needed. Corrosion solutions should be investigated such as surface passivation of 316 SS parts using nitric acid. Ultra thin silane/siloxane polymer coatings should be tried. These may be especially useful in conjunction with metal felt replacement of carbon paper. A simple cure for the very high, localized corrosion of the anode might be to diffusion bond the metal electrode support screen to bipolar plate. This will insure uniform resistance perpendicular to the plane of the cell and eliminate some of the dependence of the resistance on high stack compression. Alternative materials should be explored. Alternatives to carbon in the cell may be helpful in any context. In particular, alternatives to carbon paper GDLs such as metal felts and alternatives to carbon supports for Pt such as TiC and TiB2 might also be worthwhile and would be helpful to fuel cells as well. Some alternative to the metals we used in the cell, Mo and 316 SS, are potentially useful. These include Al/Mg/Si alloys. Corrosion resistant materials such as Nb and Mo might prove useful as cladding materials that can be hot stamp

David P. Bloomfield; Brian S. MacKenzie

2006-05-01T23:59:59.000Z

313

Sulfur accumulation in pinewood (Pinus sylvestris) induced by bacteria in a simulated seabed environment: Implications for marine archaeological wood and fossil fuels  

Science Journals Connector (OSTI)

Fresh pinewood blocks were submerged in sulfate and iron(II) containing media, inoculated with bacterial consortia isolated from seawater, aiming to simulate the seabed conditions of the Vasa shipwreck (1628). The consortia contained erosion (EB) and sulfate-reducing bacteria (SRB). Sulfur K-edge X-ray absorption near edge structure (XANES) spectroscopy and scanning X-ray spectromicroscopy images showed that organic sulfur, mainly thiols (R-SH), had accumulated in the lignin-rich middle lamella in EB-degraded parts of the wood. The sulfur content in the wood increased more than 10 times in 2 years. In another series with active inoculums from marine archaeological wood, the sulfur XANES spectra showed, after 4 years of anaerobic treatment, considerable amounts also of inorganic iron sulfides, Fe1?xS, which oxidized at atmospheric exposure. A sediment sample from the Vasa's seabed was also rich in iron sulfides, including pyrite, FeS2. X-ray fluorescence mappings of sulfur and phosphorous distributions indicate that scavenging SRB penetration, producing hydrogen sulfide in situ, is restricted to EB-degraded parts of the wood structure. The sulfur isotope depletion of 34S from ?34S = 21‰ in marine sulfate to ?34S = 6‰ and 1.8‰ for fractions of reduced sulfur and sulfate separated from a Vasa wood sample, respectively, suggests bacterial transformation. A fuller understanding of the routes of sulfur accumulation, as reactive iron sulfides and as organic sulfur, has important implications for improving conservation methods of marine archaeological wood. Moreover, the biogenic accumulation of organically bound sulfur, specifically in lignin-rich parts of waterlogged wood, has wider geochemical significance for fossil fuels of marine origin, as lignin-rich humic matter is important for the diagenetic formation of kerogens from anoxic marine sediments.

Yvonne Fors; Thomas Nilsson; Emiliana Damian Risberg; Magnus Sandström; Peter Torssander

2008-01-01T23:59:59.000Z

314

Biological Systems for Hydrogen Photoproduction (Presentation)  

SciTech Connect

This presentation summarizes NREL biological systems for hydrogen photoproduction work for the DOE Hydrogen and Fuel Cells Program Annual Merit Review and Peer Evaluation Meeting, May 14-18, 2012. General goal is develop photobiological systems for large-scale, low cost and efficient H{sub 2} production from water (barriers AH, AI and AJ). Specific tasks are: (1) Address the O{sub 2} sensitivity of hydrogenases that prevent continuity of H{sub 2} photoproduction under aerobic, high solar-to-hydrogen (STH) light conversion efficiency conditions; and (2) Utilize a limited STH H{sub 2}-producing method (sulfur deprivation) as a platform to address or test other factors limiting commercial algal H{sub 2} photoproduction, including low rates due to biochemical and engineering mechanisms.

Ghirardi, M. L.

2012-05-01T23:59:59.000Z

315

Exploration of coal-based pitch precursors for ultra-high thermal conductivity graphite fibers. Final report  

SciTech Connect

Goal was to explore the utility of coal-based pitch precursors for use in ultra high thermal conductivity carbon (graphite) fibers. From graphite electrode experience, it was established that coal-based pitches tend to form more highly crystalline graphite at lower temperatures. Since the funding was limited to year 1 effort of the 3 year program, the goal was only partially achieved. The coal-base pitches can form large domain mesophase in spite of high N and O contents. The mesophase reactivity test performed on one of the variants of coal-based pitch (DO84) showed that it was not a good candidate for carbon fiber processing. Optimization of WVU`s isotropic pitch process is required to tailor the pitch for carbon fiber processing. The hetero atoms in the coal pitch need to be reduced to improve mesophase formation.

Deshpande, G.V. [Amoco Performance Products, Inc., Alpharetta, GA (United States)

1996-12-27T23:59:59.000Z

316

An Aerosol Condensation Model for Sulfur Trioxide  

SciTech Connect

This document describes a model for condensation of sulfuric acid aerosol given an initial concentration and/or source of gaseous sulfur trioxide (e.g. fuming from oleum). The model includes the thermochemical effects on aerosol condensation and air parcel buoyancy. Condensation is assumed to occur heterogeneously onto a preexisting background aerosol distribution. The model development is both a revisiting of research initially presented at the Fall 2001 American Geophysical Union Meeting [1] and a further extension to provide new capabilities for current atmospheric dispersion modeling efforts [2]. Sulfuric acid is one of the most widely used of all industrial chemicals. In 1992, world consumption of sulfuric acid was 145 million metric tons, with 42.4 Mt (mega-tons) consumed in the United States [10]. In 2001, of 37.5 Mt consumed in the U.S., 74% went into producing phosphate fertilizers [11]. Another significant use is in mining industries. Lawuyi and Fingas [7] estimate that, in 1996, 68% of use was for fertilizers and 5.8% was for mining. They note that H{sub 2}SO{sub 4} use has been and should continue to be very stable. In the United States, the elimination of MTBE (methyl tertiary-butyl ether) and the use of ethanol for gasoline production are further increasing the demand for petroleum alkylate. Alkylate producers have a choice of either a hydrofluoric acid or sulfuric acid process. Both processes are widely used today. Concerns, however, over the safety or potential regulation of hydrofluoric acid are likely to result in most of the growth being for the sulfuric acid process, further increasing demand [11]. The implication of sulfuric acid being a pervasive industrial chemical is that transport is also pervasive. Often, this is in the form of oleum tankers, having around 30% free sulfur trioxide. Although sulfuric acid itself is not a volatile substance, fuming sulfuric acid (referred to as oleum) is [7], the volatile product being sulfur trioxide. Sulfate aerosols and mist may form in the atmosphere on tank rupture. From chemical spill data from 1990-1996, Lawuyi02 and Fingas [7] prioritize sulfuric acid as sixth most serious. During this period, they note 155 spills totaling 13 Mt, out of a supply volume of 3700 Mt. Lawuyi and Fingas [7] summarize information on three major sulfuric acid spills. On 12 February 1984, 93 tons of sulfuric acid were spilled when 14 railroad cars derailed near MacTier, Parry Sound, Ontario. On 13 December 1978, 51 railroad cars derailed near Springhill, Nova Scotia. One car, containing 93% sulfuric acid, ruptured, spilling nearly its entire contents. In July 1993, 20 to 50 tons of fuming sulfuric acid spilled at the General Chemical Corp. plant in Richmond, California, a major industrial center near San Francisco. The release occurred when oleum was being loaded into a nonfuming acid railroad tank car that contained only a rupture disk as a safety device. The tank car was overheated and this rupture disk blew. The resulting cloud of sulfuric acid drifted northeast with prevailing winds over a number of populated areas. More than 3,000 people subsequently sought medical attention for burning eyes, coughing, headaches, and nausea. Almost all were treated and released on the day of the spill. By the day after the release, another 5,000 people had sought medical attention. The spill forced the closure of five freeways in the region as well as some Bay Area Rapid Transit System stations. Apart from corrosive toxicity, there is the additional hazard that the reactions of sulfur trioxide and sulfuric acid vapors with water are extremely exothermic [10, 11]. While the vapors are intrinsically denser than air, there is thus the likelihood of strong, warming-induced buoyancy from reactions with ambient water vapor, water-containing aerosol droplets, and wet environmental surface. Nordin [12] relates just such an occurrence following the Richmond, CA spill, with the plume observed to rise to 300 m. For all practical purposes, sulfur trioxide was the constituent released from the heated tank

Grant, K E

2008-02-07T23:59:59.000Z

317

Hydrogen Analysis  

NLE Websites -- All DOE Office Websites (Extended Search)

A A H2A: Hydrogen Analysis Margaret K. Mann DOE Hydrogen, Fuel Cells, and Infrastructure Technologies Program Systems Analysis Workshop July 28-29, 2004 Washington, D.C. H2A Charter * H2A mission: Improve the transparency and consistency of approach to analysis, improve the understanding of the differences among analyses, and seek better validation from industry. * H2A was supported by the HFCIT Program H2A History * First H2A meeting February 2003 * Primary goal: bring consistency & transparency to hydrogen analysis * Current effort is not designed to pick winners - R&D portfolio analysis - Tool for providing R&D direction * Current stage: production & delivery analysis - consistent cost methodology & critical cost analyses * Possible subsequent stages: transition analysis, end-point

318

Hydrogen Technologies Group  

SciTech Connect

The Hydrogen Technologies Group at the National Renewable Energy Laboratory advances the Hydrogen Technologies and Systems Center's mission by researching a variety of hydrogen technologies.

Not Available

2008-03-01T23:59:59.000Z

319

Hydrogen | Open Energy Information  

Open Energy Info (EERE)

Sector List of Hydrogen Incentives Hydrogen Energy Data Book Retrieved from "http:en.openei.orgwindex.php?titleHydrogen&oldid271963...

320

The Hype About Hydrogen  

E-Print Network (OSTI)

economy based on the hydrogen fuel cell, but this cannot beus to look toward hydrogen. Fuel cell basics, simplifiedthe path to fuel cell commercialization. Hydrogen production

Mirza, Umar Karim

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Coincidence detection in the cochlear nucleus : implications for the coding of pitch  

E-Print Network (OSTI)

The spatio-temporal pattern in the auditory nerve (AN), i.e. the temporal pattern of AN fiber activity across the tonotopic axis, provides cues to important features in sounds such as pitch, loudness, and spatial location. ...

Wang, Grace I

2011-01-01T23:59:59.000Z

322

Suppression of tin whisker formation on fine pitch connectors by surface roughening  

Science Journals Connector (OSTI)

In the electronics industry, lead-free solder processes such as the terminal plating of electronic components, fine pitch connectors, and flexible printed circuits (FPCs) are invariably hampered by the serious pr...

Makoto Takeuchi; Kouichi Kamiyama; Katsuaki Suganuma

2006-01-01T23:59:59.000Z

323

Pitch Angle Control for Improving the Low Voltage Ride-Through Based on DFIG  

Science Journals Connector (OSTI)

Pitch angle control for wind generation is one of the most important segments in wind turbine. Wind turbine can capture the max wind energy which is called Maximum Power Point Tracking through regulating the p...

Ruming Li; Tianyu Liu; Qinghua Zhu; Li Zhang

2014-01-01T23:59:59.000Z

324

Yb-doped Large Pitch Fiber with 105µm Mode Field Diameter  

Science Journals Connector (OSTI)

We present an active Yb-doped Large Pitch Fiber with 105µm mode field diameter. It was tested in a fiber CPA system delivering <500fs, 2mJ pulses with 3.8GW peak power. The...

Jansen, Florian; Stutzki, Fabian; Eidam, Tino; Rothhardt, Jan; Hädrich, Steffen; Carstens, Henning; Jauregui, Cesar; Limpert, Jens; Tünnermann, Andreas

325

Large-pitch kagome-structured hollow-core photonic crystal fiber  

Science Journals Connector (OSTI)

We report the fabrication and characterization of a new type of hollow-core photonic crystal fiber based on large-pitch (?12?m) kagome lattice cladding. The optical characteristics...

Couny, F; Benabid, F; Light, P S

2006-01-01T23:59:59.000Z

326

Large-pitch fibers: Pushing very large mode areas to highest powers  

Science Journals Connector (OSTI)

A scalable fiber design for ytterbium-doped high performance fiber lasers and amplifiers will be presented. The working principle of large-pitch fibers (LPF) bases on delocalization of...

Limpert, Jens

327

NMR:? A Powerful Tool in the Characterization of Coal Tar Pitch  

Science Journals Connector (OSTI)

The application of NMR to coal tar pitch (CTP) characterization provides valuable information about its structure. The DEPT sequence is revealed as a useful tool to identify the different carbon types of CTP components in 13C NMR spectra. Consequently, ...

C. Díaz; C. G. Blanco

2003-06-07T23:59:59.000Z

328

Orbital effects on pitch angle diffusion of injected fast-ion beams in tokamaks  

E-Print Network (OSTI)

The effects of ion orbits on pitch angle scattering of fast ion beam injection are investigated here for the magnetic equilibrium of the ITER tokamak. Two methods are used to calculate distributions in the presence of ...

Wleklinski, Joseph J., 1974-

2005-01-01T23:59:59.000Z

329

Hydrogen and Hydrogen-Storage Materials  

Science Journals Connector (OSTI)

Currently, neutron applications in the field of hydrogen and hydrogen-storage materials represent a large and promising research ... relevant topics from this subject area, including hydrogen bulk properties (con...

Milva Celli; Daniele Colognesi; Marco Zoppi

2009-01-01T23:59:59.000Z

330

19/11/08 9:42 AMGrove Dictionary: Absolute Pitch Page 1 of 5http://ego.psych.mcgill.ca/levitin.html/pubspages/grove.html  

E-Print Network (OSTI)

19/11/08 9:42 AMGrove Dictionary: Absolute Pitch Page 1 of 5http permission and/or a fee. Absolute Pitch R. Parncutt and D. J. Levitin Absolute pitch (AP) is the ability either to identify the chroma (pitch class) of any isolated tone, using labels such as C, 261 Hz, or Do

Levitin, Daniel

331

Pitch processing is shared between language and music Tyler Perrachione1, Ev Fedorenko1, Louis Vinke2, Edward Gibson1 & Laura Dilley3  

E-Print Network (OSTI)

Pitch processing is shared between language and music Tyler Perrachione1, Ev Fedorenko1, Louis features, including reliance on pitch. Pitch in language: helps disambiguate syntactic structures (e, 1978; Breen et al., 2010). Pitch in music: melodies are encoded through the patterns of discrete

Gabrieli, John

332

Hydrogen Energy System and Hydrogen Production Methods  

Science Journals Connector (OSTI)

Hydrogen is being considered as a synthetic fuel ... . This paper contains an overview of the hydrogen production methods, those being commercially available today as well...

F. Barbir; T. N. Veziro?lu

1992-01-01T23:59:59.000Z

333

Hydrogen Production from Thermocatalytic Hydrogen Sulfide Decomposition  

Science Journals Connector (OSTI)

Experimental data on hydrogen production from hydrogen sulfide decomposition over various solid catalysts at ... The possibilities given by surface modification by vacuum methods (electron beam evaporation and ma...

O. K. Alexeeva

2002-01-01T23:59:59.000Z

334

Why Hydrogen? Hydrogen from Diverse Domestic Resources  

Energy.gov (U.S. Department of Energy (DOE))

Overview of the U.S. DOE Hydrogen, Fuel Cells and Infrastructure Technologies Program, including technical targets and research and development needs for hydrogen storage and delivery.

335

Fact #824: June 9, 2014 EPA Sulfur Standards for Gasoline  

Energy.gov (U.S. Department of Energy (DOE))

Sulfur naturally occurs in gasoline and diesel fuel, contributing to pollution when the fuel is burned. Beginning in 2004, standards were set on the amount of sulfur in gasoline (Tier 2 standards)....

336

Hydrogen Analysis Group  

SciTech Connect

NREL factsheet that describes the general activites of the Hydrogen Analysis Group within NREL's Hydrogen Technologies and Systems Center.

Not Available

2008-03-01T23:59:59.000Z

337

The Hype About Hydrogen  

E-Print Network (OSTI)

another promising solution for hydrogen storage. However,storage and delivery, and there are safety issues as well with hydrogen

Mirza, Umar Karim

2006-01-01T23:59:59.000Z

338

Hydrogen Technology Validation  

Fuel Cell Technologies Publication and Product Library (EERE)

This fact sheet provides a basic introduction to the DOE Hydrogen National Hydrogen Learning Demonstration for non-technical audiences.

339

Hydrogen Dissociation on Pd4S Surfaces  

SciTech Connect

Exposure of Pd-based hydrogen purification membranes to H,S. a common contaminant in coal gasification streams, can cause membrane performance to deteriorate, either by deactivating surface sites required for dissociative H, adsorption or by forming a low-permeability sulfide scale. In this work. the composition, structure, and catalytic activity of Pd4S, a surface scale commonly observed in Pd-membrane separation of hydrogen from sulfur-containing gas streams, were examined using a combination of experimental characterization and density functional theory (DFT) calculations. A Pd,S sample was prepared by exposing a 100 f1m Pd foil to H2S at 908 K. Both X-ray photoemission depth profiling and low energy ion scattering spectroscopic (LEISS) analysis reveal slight sulfur-enrichment of the top surface of the sample. This view is consistent with the predictions of DFT atomistic thermodynamic calculations. which identified S-terminated Pd,S surfaces as energetically favored over corresponding Pd-terminated surfaces. Activation barriers for H2 dissociation on the Pd,S surfaces were calculated. Although barriers are higher than on Pd(lll). transition state theory analysis identified reaction pathways on the S-terminated surfaces for which hydrogen dissociation rates are high enough to sustain the separation process at conditions relevant to gasification applications.

Miller, J.B.; Alfonso, D.R.; Howard, B.H.; O'Brien, C.P.; Morreale, B.D.

2009-01-01T23:59:59.000Z

340

ORIGINAL ARTICLE Sulfur oxidizers dominate carbon fixation  

E-Print Network (OSTI)

). Methylotrophs and iron oxidizers were also active in plume waters and expressed key proteins for methane by bacteria (especially, alpha-, gamma- and epsilon-proteobacteria) that likely participate in the oxidationORIGINAL ARTICLE Sulfur oxidizers dominate carbon fixation at a biogeochemical hot spot in the dark

Hansell, Dennis

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

High-Sulfur Coal for Generating Electricity  

Science Journals Connector (OSTI)

...amounts of coal, because...Director-Mineral Re-sources...of Gas from Coal through a...on coals of high ash-fusion temperature...per ton of high-sulfur coal burned. Absorp-tion...particulate matter as well as...capable of remov-ing up to...

James T. Dunham; Carl Rampacek; T. A. Henrie

1974-04-19T23:59:59.000Z

342

Short communication Influence of molybdenum and sulfur on copper  

E-Print Network (OSTI)

Short communication Influence of molybdenum and sulfur on copper metabolism in sheep: comparison of molybdenum able to trigger the copper sulfur molybdenum interference in sheep was measured with either only) and 4 increasing molybdenum doses. The sulfur-molybdenum-copper interference was quantified

Paris-Sud XI, Université de

343

A novel lithium/sulfur battery based on sulfur/graphene nanosheet composite cathode and gel polymer electrolyte  

Science Journals Connector (OSTI)

A novel sulfur/graphene nanosheet (S/GNS) composite was prepared ... ball milling of sulfur with commercial multi-layer graphene nanosheet, followed by a heat treatment. ... of irregularly interlaced nanosheet-li...

Yongguang Zhang; Yan Zhao; Zhumabay Bakenov

2014-03-01T23:59:59.000Z

344

A simple approach to synthesize nanosized sulfur/graphene oxide materials for high-performance lithium/sulfur batteries  

Science Journals Connector (OSTI)

We report on a simple and facile synthesis route for the sulfur/graphene oxide composite via ultrasonic mixing of the nano-sulfur and graphene oxide aqueous suspensions followed by a low-temperature heat treat...

Yongguang Zhang; Yan Zhao; Zhumabay Bakenov

2014-07-01T23:59:59.000Z

345

Microchannel Distillation of JP-8 Jet Fuel for Sulfur Content Reduction  

SciTech Connect

In microchannel based distillation processes, thin vapor and liquid films are contacted in small channels where mass transfer is diffusion-limited. The microchannel architecture enables improvements in distillation processes. A shorter height equivalent of a theoretical plate (HETP) and therefore a more compact distillation unit can be achieved. A microchannel distillation unit was used to produce a light fraction of JP-8 fuel with reduced sulfur content for use as feed to produce fuel-cell grade hydrogen. The HETP of the microchannel unit is discussed, as well as the effects of process conditions such as feed temperature, flow rate, and reflux ratio.

Zheng, Feng; Stenkamp, Victoria S.; TeGrotenhuis, Ward E.; Huang, Xiwen; King, David L.

2006-09-16T23:59:59.000Z

346

FISCAL YEAR 2006 REPORT ON ELECTROLYZER COMPONENT DEVELOPMENT FOR THE HYBRID SULFUR PROJECT  

SciTech Connect

Thermochemical processes are being developed to provide global-scale quantities of hydrogen. A variant on sulfur-based thermochemical cycles is the Hybrid Sulfur (HyS) Process which uses a sulfur dioxide depolarized electrolyzer (SDE) to produce the hydrogen. In FY05, testing at the Savannah River National Laboratory (SRNL) explored a low temperature fuel cell design concept for the SDE. The advantages of this design concept include high electrochemical efficiency and small volumetric footprint that is crucial for successful implementation on a commercial scale. A key component of the SDE is the ion conductive membrane through which protons produced at anode migrate to the cathode and react to produce hydrogen. An ideal membrane for the SDE should have both low ionic resistivity and low sulfur dioxide transport. These features allow the electrolyzer to perform at high currents with low potentials, along with preventing contamination of both the hydrogen output and poisoning of the catalysts involved. Another key component is the electrocatalyst material used for the anode and cathode. Good electrocatalysts should be chemically stable and low overpotential for the desired electrochemical reactions. This report summarizes results from activities to evaluate different membrane and electrocatalyst materials for the SDE. Several different types of commercially-available membranes were analyzed for ionic resistance and sulfur dioxide transport including perfluorinated sulfonic acid, sulfonated poly-etherketone-ketone, and poly-benzimidazole membranes. Of these membrane types, the poly-benzimidazole (PBI) membrane, Celtec-L, exhibited the best combination of characteristics for use in an SDE. Testing examined the activity and stability of platinum and palladium as electrocatalyst for the SDE in sulfuric acid solutions. Cyclic and linear sweep voltammetry revealed that platinum provided better catalytic activity with much lower potentials and higher currents than palladium. Testing also showed that the catalyst activity is strongly influenced by concentration of the sulfuric acid. Various cell configurations were examined with respect to the deposition of electrocatalyst and use of conductive carbon materials such as carbon cloth and carbon paper. Findings from these evaluations and the results of the membrane and electrocatalyst testing, we prepared three different membrane electrode assemblies (MEA) for electrolyzer testing. The first MEA consisted of a Nafion{reg_sign} membrane with platinum electrocatalyst deposited on carbon cloths, which were heat pressed onto the membrane, an assembly identical to those used in proton exchange membrane fuel cells. The second MEA also used a Nafion membrane with the electrocatalysts deposited directly onto the membrane. The third MEA proved similar to the second but utilized a PBI membrane in place of the Nafion{reg_sign} membrane. Tailor of the membrane and catalysts properties for the SDE system was concluded as a required step for the technology to move forward. It was also recommended the evaluation of the tested and new developed materials at conditions closer to the SDE operating conditions and for longer period of time.

Colon-Mercado, H; David Hobbs, D; Daryl Coleman, D; Amy Ekechukwu, A

2006-08-03T23:59:59.000Z

347

Hydrogen Delivery Technologies and Systems - Pipeline Transmission...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Hydrogen Delivery Technologies and Systems - Pipeline Transmission of Hydrogen Hydrogen Delivery Technologies and Systems - Pipeline Transmission of Hydrogen Hydrogen Delivery...

348

Nuclear Hydrogen Initiative  

NLE Websites -- All DOE Office Websites (Extended Search)

Advanced Nuclear Research Advanced Nuclear Research Office of Nuclear Energy, Science and Technology FY 2003 Programmatic Overview Nuclear Hydrogen Initiative Nuclear Hydrogen Initiative Office of Nuclear Energy, Science and Technology Henderson/2003 Hydrogen Initiative.ppt 2 Nuclear Hydrogen Initiative Nuclear Hydrogen Initiative Program Goal * Demonstrate the economic commercial-scale production of hydrogen using nuclear energy by 2015 Need for Nuclear Hydrogen * Hydrogen offers significant promise for reduced environmental impact of energy use, specifically in the transportation sector * The use of domestic energy sources to produce hydrogen reduces U.S. dependence on foreign oil and enhances national security * Existing hydrogen production methods are either inefficient or produce

349

Graphene-Wrapped Sulfur Particles as a Rechargeable Lithium–Sulfur Battery Cathode Material with High Capacity and Cycling Stability  

Science Journals Connector (OSTI)

Graphene-Wrapped Sulfur Particles as a Rechargeable Lithium–Sulfur Battery Cathode Material with High Capacity and Cycling Stability ... The resulting graphene–sulfur composite showed high and stable specific capacities up to ?600 mAh/g over more than 100 cycles, representing a promising cathode material for rechargeable lithium batteries with high energy density. ...

Hailiang Wang; Yuan Yang; Yongye Liang; Joshua Tucker Robinson; Yanguang Li; Ariel Jackson; Yi Cui; Hongjie Dai

2011-06-24T23:59:59.000Z

350

Pitch deviation measurement of an involute spur gear by a rotary profiling system  

Science Journals Connector (OSTI)

Abstract This paper presents surface-profiling based gear pitch deviation measurement for an involute spur gear. A rotary profiling system, which consists of an air-bearing spindle and a displacement sensor with a diamond stylus, is employed to measure gear pitch deviation. In measurement of gear pitch deviation, an eccentric error between a gear axis and a motion axis of the rotary stage in the profiling system would affect accuracy of gear profile measurement. In this paper, at first, the influence of the eccentric error on measurement of gear pitch deviation is estimated in computer simulation based on a geometric model of the profiling system. After that, a new scanning method named “opposite-direction dual scanning method” is proposed so that a steep profile of gear flank surface with a local slope of up to 90° can be measured by the developed rotary profiling system. For compensating distortions in the measured gear tooth profile, which are induced not only by the eccentric error but also by a probe offset introduced by the proposed scanning method, a self-calibration and compensation method is applied. To verify the feasibility of the proposed method, measurement of gear pitch deviation of a master involute spur gear with a certificate data is carried out. Measurement uncertainty of the proposed method is also analyzed.

Bin Xu; Yuki Shimizu; So Ito; Wei Gao

2014-01-01T23:59:59.000Z

351

In-plane pitch control of cholesteric liquid crystals by formation of artificial domains via patterned photopolymerization  

Science Journals Connector (OSTI)

A controlled helix pitch modulation in the in-plane direction of a planarly aligned cholesteric liquid crystal cell is demonstrated by using photopolymerizable cholesteric liquid...

Yoshida, Hiroyuki; Miura, Yusuke; Tokuoka, Kazuki; Suzuki, Satoshi; Fujii, Akihiko; Ozaki, Masanori

2008-01-01T23:59:59.000Z

352

Hydrogen Pipeline Working Group Workshop: Code for Hydrogen Pipelines...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Pipeline Working Group Workshop: Code for Hydrogen Pipelines Hydrogen Pipeline Working Group Workshop: Code for Hydrogen Pipelines Code for Hydrogen Piping and Pipelines. B31...

353

Bulk Hydrogen Storage - Strategic Directions for Hydrogen Delivery...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Bulk Hydrogen Storage - Strategic Directions for Hydrogen Delivery Workshop Bulk Hydrogen Storage - Strategic Directions for Hydrogen Delivery Workshop Targets, barriers and...

354

Hydrogen Bonded Arrays: The Power of Multiple Hydrogen Bonds...  

NLE Websites -- All DOE Office Websites (Extended Search)

Bonded Arrays: The Power of Multiple Hydrogen Bonds. Hydrogen Bonded Arrays: The Power of Multiple Hydrogen Bonds. Abstract: Hydrogen bond interactions in small covalent model...

355

High Permeability Ternary Palladium Alloy Membranes with Improved Sulfur and Halide Tolerance  

NLE Websites -- All DOE Office Websites (Extended Search)

9 9 HigH Permeability ternary Palladium alloy membranes witH imProved sulfur and Halide tolerance Description A critical step in the transition to the hydrogen economy is the separation of hydrogen from coal gasification gases (syngas) or methane. This is typically accomplished through membrane separation. Past research has shown that palladium (Pd) alloys possess great potential as robust and economical membranes. However, the search for the optimal binary or ternary alloys is an involved and costly process due to the immense number of alloy variations that could be prepared and tested. Recent modeling work at Georgia Institute of Technology using density functional theory (DFT) identified several promising ternary alloy compositions with improved

356

Sulfur poisoning of H/sub 2/ and CO adsorption on supported nickel  

SciTech Connect

New and previously published adsorption data for hydrogen and carbon monoxide on various fresh and presulfided nickel/alumina catalysts showed that at 298/sup 0/K, the fractional hydrogen uptake decreased linearly with sulfur coverage; that irreversible adsorption of carbon monoxide was higher on sulfided than on fresh catalysts at 190/sup 0/, 273/sup 0/, and 300/sup 0/K, probably as a result of nickel tetracarbonyl formation; and that substantial amounts of nickel tetracarbonyl were formed in the gas phase in the presence of sulfided catalysts, which caused significant loss of nickel. The formation of the nickel tetracarbonyl probably proceeded via stable subcarbonyl species. At carbon monoxide pressures of < 1 mm Hg, no carbon monoxide absorbed at room temperature, but at methanation temperature (473/sup 0/-673/sup 0/K), dissociative adsorption did take place. Chemisorption of carbon monoxide therefore, cannot be used to measure nickel dispersion on used catalysts.

Bartholomew, C.H.; Pannell, R.B.

1980-01-01T23:59:59.000Z

357

Studies on the sulfur poisoning of Ru-RuO{sub x}/TiO{sub 2} catalyst for the adsorption and methanation of carbon monoxide  

SciTech Connect

The effects of sulfur poisoning on the chemisorption and on the methanation of carbon monoxide over Ru/TiO{sub 2} catalyst were investigated by FTIR spectroscopy and volumetric gas adsorption measurements. The CS{sub 2} molecules are {eta}` bonded to Ru sites through one of the sulfur atoms and decompose to the constituent elements on thermal activation. Each S atom may deactivate 3 to 10 metal sites even at low coverages, the effect being more pronounced on the chemisorption of hydrogen. The deposited sulfur (and possibly carbon also) sterically hinders the formation of certain multicarbonyl and monocarbonyl species (vCO in 2055-2140 cm{sup -1} region), which otherwise transform to methane via surface methylene groups in the presence of chemisorbed hydrogen and are found to play an important role in the low-temperature methanation activity of the studied catalyst. The Ru-CO species giving rise to lower frequency vibrational bands are affected to a lesser extent. The presence of sulfur also results in the development of some new CO binding states which are weak and are identified with the CO and S coadsorbed at Ru sites of different oxidation states or of varying crystallographic nature. The CO adsorbed in these states is not reactive to hydrogen. 45 refs., 9 figs., 1 tab.

Kamble, V.S.; Londhe, V.P.; Gupta, N.M. [Bhambha Atomic Research centre, Bombay (India)] [and others] [Bhambha Atomic Research centre, Bombay (India); and others

1996-02-01T23:59:59.000Z

358

Modular multimorphic kinematic arm structure and pitch and yaw joint for same  

DOE Patents (OSTI)

A multimorphic kinematic manipulator arm is provided with seven degrees of freedom and modular kinematic redundancy through identical pitch/yaw, shoulder, elbow and wrist joints and a wrist roll device at the wrist joint, which further provides to the manipulator arm an obstacle avoidance capability. The modular pitch/yaw joints are traction drive devices which provide backlash free operation with smooth torque transmission and enhanced rigidity. A dual input drive arrangement is provided for each joint resulting in a reduction of the load required to be assumed by each drive means and providing selective pitch and yaw motions by control of the relative rotational directions of the input drive means. 12 figs.

Martin, H.L.; Williams, D.M.; Holt, W.E.

1987-04-21T23:59:59.000Z

359

Submilisecond acoustic pulses: effective pitch and Weber-Fechner law in discrimination of duration times  

E-Print Network (OSTI)

The enclosed tests demonstrate that an effective pitch can be attributed to acoustic signals shorter then tenths of milliseconds. A power-law dependence of this pitch on the signal's duration time is found for subjects tested with Gaussian pulses. The discrimination threshold for the pulse duration time reported on the basis of the effective pitch increases proportionally to the duration time itself, i.e. it follows the Weber-Fechner law. A model based on the "Helmholtz's harp" idea, i.e. a series of damped resonators tuned in the audible range of frequencies, reveals the mechanism of producing a maximum in the filtered spectrum of the pulse. This corroborates the power law in the dependence of the position of the maximum on the duration time of the pulse. The model indicates a possibility of designing a manmade device dedicated to determination of the durations so short that they are inaccessible by direct measurements.

Majka, Marcin; G?barowski, Robert; Zieli?ski, Piotr

2014-01-01T23:59:59.000Z

360

Investigation of bonding mechanism of coking on semi-coke from lignite with pitch and tar  

SciTech Connect

In coking, the bonding ability of inert macerals by reactive macerals is dependent on various parameters and also is related to the wettability of the inert macerals. In this study, the effect of carbonization temperature on the wettability of semi-cokes produced at various temperatures has been investigated. Soma and Yatagan semicokes represent inert macerals, and pitch was used as a reactive structure in the experiments. The briquetted pitch blocks were located on the semi-cokes and heated from the softening temperature of pitch (60{sup o}C) to 140{sup o}C to observe the wettability. In addition, liquid tar was also used to determine the wettability of semi-cokes. From the standpoint of wettability, the temperature of 900{sup o}C was determined to be the critical point for coke produced from sub-bituminous coals. 15 refs., 6 figs., 2 tabs.

Vedat Arslan [Dokuz Eylul University, Izmir (Turkey). Engineering Faculty

2006-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Hydrogen from Coal  

NLE Websites -- All DOE Office Websites (Extended Search)

Coal Coal Edward Schmetz Office of Sequestration, Hydrogen and Clean Coal Fuels U.S. Department of Energy DOE Workshop on Hydrogen Separations and Purification Technologies September 8, 2004 Presentation Outline ƒ Hydrogen Initiatives ƒ Hydrogen from Coal Central Production Goal ƒ Why Coal ƒ Why Hydrogen Separation Membranes ƒ Coal-based Synthesis Gas Characteristics ƒ Technical Barriers ƒ Targets ƒ Future Plans 2 3 Hydrogen from Coal Program Hydrogen from Coal Program FutureGen FutureGen Hydrogen Fuel Initiative Hydrogen Fuel Initiative Gasification Fuel Cells Turbines Gasification Fuel Cells Turbines Carbon Capture & Sequestration Carbon Capture & Sequestration The Hydrogen from Coal Program Supports the Hydrogen Fuel Initiative and FutureGen * The Hydrogen Fuel Initiative is a $1.2 billion RD&D program to develop hydrogen

362

Hydrogen, Fuel Cells & Infrastructure Technologies ProgramHydrogen, Fuel Cells & Infrastructure Technologies Program Hydrogen Codes &  

E-Print Network (OSTI)

Hydrogen, Fuel Cells & Infrastructure Technologies ProgramHydrogen, Fuel Cells & Infrastructure)DescriptionMilestone #12;Hydrogen, Fuel Cells & Infrastructure Technologies ProgramHydrogen, Fuel Cells & Infrastructure Technologies Program Hydrogen Codes & Standards #12;Hydrogen Codes & Standards: Goal & Objectives Goal

363

Generalized van der Waals theory for the twist elastic modulus and helical pitch of cholesterics  

E-Print Network (OSTI)

We present a generalized van der Waals theory for a lyotropic cholesteric system of chiral spherocylinders based on the classical Onsager theory for hard anisometric bodies. The rods consist of a hard spherocylindrical backbone surrounded with a square-well potential to account for attractive (or soft repulsive) interactions. Long-ranged chiral interactions are described by means of a simple pseudo-scalar potential which is appropriate for weak chiral forces of a predominant electrostatic origin. Based on the formalism proposed by Straley [Phys. Rev. A {\\bf 14}, 1835 (1976)] we derive explicit algebraic expressions for the twist elastic modulus and the cholesteric pitch for rods as a function of density and temperature. The pitch varies non-monotonically with density, with a sharp decrease at low packing fractions and a marked increase at higher packing fractions. A similar trend is found for the temperature dependence. The unwinding of the helical pitch at high densities (or low temperatures) originates from a marked increase in the local nematic order and a steep increase of the twist elastic resistance associated with near-parallel local rod configurations. This contrasts with the commonly held view that the increase in pitch with decreasing temperature as often observed in cholesterics is due to layer formation resulting from pre-smectic fluctuations. The increase in pitch with increasing temperature is consistent with an entropic unwinding as the chiral interaction becomes less and less significant than the thermal energy. The variation of the pitch with density, temperature and contour length is in qualitative agreement with recent experimental results on colloidal {\\em fd} rods.

H. H. Wensink; G. Jackson

2009-05-26T23:59:59.000Z

364

sulfur dioxide emissions | OpenEI  

Open Energy Info (EERE)

sulfur dioxide emissions sulfur dioxide emissions Dataset Summary Description Emissions from energy use in buildings are usually estimated on an annual basis using annual average multipliers. Using annual numbers provides a reasonable estimation of emissions, but it provides no indication of the temporal nature of the emissions. Therefore, there is no way of understanding the impact on emissions from load shifting and peak shaving technologies such as thermal energy storage, on-site renewable energy, and demand control. Source NREL Date Released April 11th, 2011 (3 years ago) Date Updated April 11th, 2011 (3 years ago) Keywords buildings carbon dioxide emissions carbon footprinting CO2 commercial buildings electricity emission factors ERCOT hourly emission factors interconnect nitrogen oxides

365

Hydrogen transfer in transformations of olefin and thiophene compounds for the refining of gasoline fractions  

Science Journals Connector (OSTI)

Abstract Hydrogen transfer reactions in the transformations of mixtures of model hydrocarbons (hydrogen donors and acceptors) on zeolite catalysts were studied. Hydrogen donors were represented by various classes of hydrocarbons, and acceptors—by unsaturated (olefin) and thiophene compounds. The [H]-donor activity series of hydrocarbons was revealed. Strong differences in the transformation pathways of 1-hexene and 1-octene under the conditions of catalytic refining were demonstrated. A new method for the refining of low-rank gasoline fractions was proposed. The method is based on the hydrogen transfer reactions between hydrogen donor hydrocarbons and hydrogen acceptor hydrocarbons, which proceed without molecular hydrogen. The proposed method allows the simultaneous removal of sulfur (more than 95%) and unsaturated (more than 90%) compounds.

Oleg V. Potapenko; Vladimir P. Doronin; Tatyana P. Sorokina; Vladimir A. Likholobov

2014-01-01T23:59:59.000Z

366

HYDROGEN REGIONAL INFRASTRUCTURE PROGRAM  

E-Print Network (OSTI)

to serve as "go-to" organization to catalyze PA Hydrogen and Fuel Cell Economy development #12;FundingHYDROGEN REGIONAL INFRASTRUCTURE PROGRAM IN PENNSYLVANIA HYDROGEN REGIONAL INFRASTRUCTURE PROGRAM IN PENNSYLVANIA Melissa Klingenberg, PhDMelissa Klingenberg, PhD #12;Hydrogen ProgramHydrogen Program Air Products

367

Sulfur/three-dimensional graphene composite for high performance lithium–sulfur batteries  

Science Journals Connector (OSTI)

Abstract A sulfur/graphene composite is prepared by loading elemental sulfur into three-dimensional graphene (3D graphene), which is assembled using a metal ions assisted hydrothermal method. When used as cathode materials for lithium–sulfur (Li–S) batteries, the sulfur/graphene composite (S@3D-graphene) with 73 wt % sulfur shows a significantly enhanced cycling performance (>700 mAh g?1 after 100 cycles at 0.1C rate with a Coulombic efficiency > 96%) as well as high rate capability with a capacity up to 500 mAh g?1 at 2C rate (3.35 A g?1). The superior electrochemical performance could be attributed to the highly porous structure of three-dimensional graphene that not only enables stable and continue pathway for rapid electron and ion transportation, but also restrain soluble polysulfides and suppress the “shuttle effect”. Moreover, the robust structure of 3D graphene can keep cathode integrity and accommodate the volume change during high-rate charge/discharge processes, making it a promising candidate as cathode for high performance Li–S batteries.

Chunmei Xu; Yishan Wu; Xuyang Zhao; Xiuli Wang; Gaohui Du; Jun Zhang; Jiangping Tu

2015-01-01T23:59:59.000Z

368

Carbon/Sulfur Nanocomposites and Additives for High-Energy Lithium Sulfur Batteries  

Energy.gov (U.S. Department of Energy (DOE))

2011 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program Annual Merit Review and Peer Evaluation

369

Carbon/Sulfur Nanocomposites and Additives for High-Energy Lithium Sulfur Batteries  

Energy.gov (U.S. Department of Energy (DOE))

2012 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

370

EVALUATION OF PROTON-CONDUCTING MEMBRANES FOR USE IN A SULFUR-DIOXIDE DEPOLARIZED ELECTROLYZER  

SciTech Connect

The chemical stability, sulfur dioxide transport, ionic conductivity, and electrolyzer performance have been measured for several commercially available and experimental proton exchange membranes (PEMs) for use in a sulfur dioxide depolarized electrolyzer (SDE). The SDE's function is to produce hydrogen by using the Hybrid Sulfur (HyS) Process, a sulfur based electrochemical/thermochemical hybrid cycle. Membrane stability was evaluated using a screening process where each candidate PEM was heated at 80 C in 60 wt. % H{sub 2}SO{sub 4} for 24 hours. Following acid exposure, chemical stability for each membrane was evaluated by FTIR using the ATR sampling technique. Membrane SO{sub 2} transport was evaluated using a two-chamber permeation cell. SO{sub 2} was introduced into one chamber whereupon SO{sub 2} transported across the membrane into the other chamber and oxidized to H{sub 2}SO{sub 4} at an anode positioned immediately adjacent to the membrane. The resulting current was used to determine the SO{sub 2} flux and SO{sub 2} transport. Additionally, membrane electrode assemblies (MEAs) were prepared from candidate membranes to evaluate ionic conductivity and selectivity (ionic conductivity vs. SO{sub 2} transport) which can serve as a tool for selecting membranes. MEAs were also performance tested in a HyS electrolyzer measuring current density versus a constant cell voltage (1V, 80 C in SO{sub 2} saturated 30 wt% H2SO{sub 4}). Finally, candidate membranes were evaluated considering all measured parameters including SO{sub 2} flux, SO{sub 2} transport, ionic conductivity, HyS electrolyzer performance, and membrane stability. Candidate membranes included both PFSA and non-PFSA polymers and polymer blends of which the non-PFSA polymers, BPVE-6F and PBI, showed the best selectivity.

Hobbs, D.; Elvington, M.; Colon-Mercado, H.

2009-11-11T23:59:59.000Z

371

Quantitative evaluation of hydrogen sulfide at 0.3 M and 1.0 M-hydrogen-ion concentration  

E-Print Network (OSTI)

. In the present study, cobalt sulfide was quantitatively re? covered from a solution whose hydrogen-ion concentration -12was calculated to be 6.95 x 10 M. As in the case of zinc sulfide, this was to be expected, since a decreased hydrogen-ion concentration... quantitatively to an electrolysis beaker with distilled water. The copper 28 was deposited on a platinum gauze cathode in 9 hours from a solution containing a 5 ml. excess of 18 M sulfuric acid in 125 ml., and a current of 0.5 ampere. 12. Copper (II) - Zinc...

Machel, Albert R.

1958-01-01T23:59:59.000Z

372

FCT Hydrogen Production: Basics  

NLE Websites -- All DOE Office Websites (Extended Search)

Basics to someone by E-mail Basics to someone by E-mail Share FCT Hydrogen Production: Basics on Facebook Tweet about FCT Hydrogen Production: Basics on Twitter Bookmark FCT Hydrogen Production: Basics on Google Bookmark FCT Hydrogen Production: Basics on Delicious Rank FCT Hydrogen Production: Basics on Digg Find More places to share FCT Hydrogen Production: Basics on AddThis.com... Home Basics Central Versus Distributed Production Current Technology R&D Activities Quick Links Hydrogen Delivery Hydrogen Storage Fuel Cells Technology Validation Manufacturing Codes & Standards Education Systems Analysis Contacts Basics Photo of hydrogen production in photobioreactor Hydrogen, chemical symbol "H", is the simplest element on earth. An atom of hydrogen has only one proton and one electron. Hydrogen gas is a diatomic

373

The Transition to Hydrogen  

E-Print Network (OSTI)

above, not all hydrogen production methods are equal inrealize hydrogen’s bene- ?ts fully, production methods thathydrogen vary depending on which primary source produces it and which production method

Ogden, Joan M

2005-01-01T23:59:59.000Z

374

The Hydrogen Economy  

Science Journals Connector (OSTI)

The hydrogen economy is a vision for a future in which hydrogen replaces fossil fuels. There are a variety ... of methods for generating, storing and delivering hydrogen since no single method has yet proven supe...

2009-01-01T23:59:59.000Z

375

Hydrogen storage methods  

Science Journals Connector (OSTI)

Hydrogen exhibits the highest heating value per mass of all chemical fuels. Furthermore, hydrogen is regenerative and environmentally friendly. There are two reasons why hydrogen is not the major fuel of today’s ...

Andreas Züttel

2004-04-01T23:59:59.000Z

376

Hydrogen Fuel Cell Vehicles  

E-Print Network (OSTI)

Hydrogen Fuel Cell Vehicles UCD-ITS-RR-92-14 September byet al. , 1988,1989 HYDROGEN FUEL-CELL VEHICLES: TECHNICALIn the FCEV, the hydrogen fuel cell could supply the "net"

Delucchi, Mark

1992-01-01T23:59:59.000Z

377

Hydrogen Fuel Cell Vehicles  

E-Print Network (OSTI)

for the hydrogen refueling station. Compressor cost: inputcost) Compressor power requirement: input data 288.80 Initial temperature of hydrogen (Compressor cost per unit of output ($/hp/million standard ft [SCF] of hydrogen/

Delucchi, Mark

1992-01-01T23:59:59.000Z

378

Influence of Sulfur on the Carbon Deposition in Liquid Hydrocarbon Steam Reforming over CeO2-Al2O3 supported Ni and Rh Catalysts  

SciTech Connect

This study was performed to elucidate the influence of sulfur on the carbon deposition in steam reforming of liquid hydrocarbons over CeO{sub 2}-Al{sub 2}O{sub 3} supported Ni and Rh catalysts at 800 C. The characteristics of the carbon deposits on the used catalysts after the reactions without and with sulfur were investigated by temperature-programmed oxidation (TPO), transmission electron microscopy (TEM), scanning transmission X-ray microscopy (STXM), temperature-programmed hydrogenation (TPH), X-ray absorption near edge structure (XANES), and scanning electron microscopy (SEM). Though abundant carbon deposits can accumulate on the pure CeO{sub 2}-Al{sub 2}O{sub 3} support due to fuel thermal cracking, the addition of Ni or Rh metal greatly reduced the carbon deposition in the sulfur-free reaction. The presence of sulfur increased the carbon deposition on both catalysts, which has a much more significant impact for the Ni catalyst. Carbon XANES study on the used catalysts revealed that graphitic carbon was dominant in the presence of sulfur, while oxidized carbon species (quinone-like carbon, carboxyl and carbonate) prevailed without sulfur. Meanwhile, the formation of carboxyl and carbonate more dramatically dropped on the Ni catalyst than that on the Rh catalyst. Our results strongly suggest that (I) the presence of sulfur can suppress carbon gasification and promote the formation of graphitic carbon on reforming catalysts due mainly to its poisoning effect on metals, and (II) Rh catalyst possesses stronger capability to maintain carbon gasification activity than Ni catalyst in the presence of sulfur.

C Xie; Y Chen; Y Li; X Wang; C Song

2011-12-31T23:59:59.000Z

379

NETL: Hydrogen Selective Exfoliated Zeolite Membranes  

NLE Websites -- All DOE Office Websites (Extended Search)

Designing and Validating Ternay Pd Alloys for Optimum Sulfur/Carbon Resistance Designing and Validating Ternay Pd Alloys for Optimum Sulfur/Carbon Resistance Project No.: DE-FE0001181 Gas Permeation Cell and Test Stand Pall Corporation is developing an economically-viable hydrogen/carbon dioxide (H2/CO2) separation membrane system that would allow efficient capture of CO2 at high temperature and pressure from gasified coal in the presence of typical contaminants. Goals for the project include creating an advanced palladium alloy for optimum hydrogen separation performance using combinatorial material methods for high-throughput screening, testing, and characterization and demonstrating durability by long term testing of a pilot membrane module at a commercial coal gasification facility. The advantages of this technology are reduction of CO2 compression costs, lack of need for both upstream and downstream heat exchange and complex heat integration, and the potential for integration with water gas shift in a single compact membrane reactor system.

380

Hydrogen Permeation Barrier Coatings  

SciTech Connect

Gaseous hydrogen, H2, has many physical properties that allow it to move rapidly into and through materials, which causes problems in keeping hydrogen from materials that are sensitive to hydrogen-induced degradation. Hydrogen molecules are the smallest diatomic molecules, with a molecular radius of about 37 x 10-12 m and the hydrogen atom is smaller still. Since it is small and light it is easily transported within materials by diffusion processes. The process of hydrogen entering and transporting through a materials is generally known as permeation and this section reviews the development of hydrogen permeation barriers and barrier coatings for the upcoming hydrogen economy.

Henager, Charles H.

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Technology: Hydrogen and hydrates  

Science Journals Connector (OSTI)

... . 2249–2258 (2004). US Department of Energy Hydrogen Posture Plan http://www.eere.energy.gov/hydrogenandfuelcells/pdfs/hydrogen_posture_plan.pdf Kuhs, W. F. , Genov, ...

Ferdi Schüth

2005-04-06T23:59:59.000Z

382

Hydrogen Pipeline Working Group  

Energy.gov (U.S. Department of Energy (DOE))

The Hydrogen Pipeline Working Group of research and industry experts focuses on issues related to the cost, safety, and reliability of hydrogen pipelines. Participants represent organizations...

383

Hydrogen and fuel taxation.  

E-Print Network (OSTI)

??The competitiveness of hydrogen depends on how it is integrated in the energy tax system in Europe. This paper addresses the competitiveness of hydrogen and… (more)

Hansen, Anders Chr.

2007-01-01T23:59:59.000Z

384

Adsorptive desulfurization of low sulfur diesel fuel using palladium containing mesoporous silica synthesized via a novel in-situ approach  

Science Journals Connector (OSTI)

Abstract In this work, a novel in-situ synthesis route was applied for preparation of an adsorbent, i.e. palladium containing MCM-41. At first, a hydrophobic palladium precursor was added to the ethanolic micellar solution followed by vacuum distillation of ethanol which decreases the hydrophobic characteristic of the solution. Distillation caused diffusion of hydrophobic palladium precursor into the hydrophobic core of the micelles. Then, tetraethyl orthosilicate was added to the above solution and the silicate spices arranged around the palladium containing micelles. The XRD, N2 physisorption and TEM studies revealed that 4 wt.% palladium loading was achieved without considerable loss of pore ordering. H2-TPR showed that the palladium nanoparticles were accessible for hydrogen molecules. Adsorptive desulfurization of low sulfur diesel fuel was then investigated using synthesized samples. The effect of three valuable parameters, i.e., temperature (25, 75, 150 and 200 °C), concentration of palladium (2, 4 and 5 wt.%) and feed flow rate (0.3 and 1 mL/min) were tested using a fixed-bed flowing device. The highest sulfur break through adsorption capacity and total sulfur adsorption capacity obtained at 200 °C, 0.3 mL/min of feed flow rate and 4 wt.% of palladium concentration were 1.67 and 2.35 mg sulfur/g adsorbent, respectively.

Mohammad Teymouri; Abdolraouf Samadi-Maybodi; Amir Vahid; Aliakbar Miranbeigi

2013-01-01T23:59:59.000Z

385

Wood Gas Processing To Generate Pure Hydrogen Suitable for PEM Fuel Cells  

Science Journals Connector (OSTI)

Wood Gas Processing To Generate Pure Hydrogen Suitable for PEM Fuel Cells ... A temperature profile along the three reactors was set, attempting to optimize the overall CO conversion rate. ... Low GHSV, low sulfur loads in the feed gas (see Table 7), and the approach of temperature optimization enabled high overall conversion rates. ...

Silvester Fail; Nicolas Diaz; Florian Benedikt; Michael Kraussler; Julian Hinteregger; Klaus Bosch; Marius Hackel; Reinhard Rauch; Hermann Hofbauer

2014-10-31T23:59:59.000Z

386

Effect of different secondary quinoline insoluble content on the cellular structure of carbon foam derived from coal tar pitch  

Science Journals Connector (OSTI)

Abstract Carbon foam was produced using mesophase pitches obtained under different temperatures as precursors, via foaming and carbonization process. The physicochemical properties of mesophase pitch, as well as the microstructure and physical properties of carbon foam were investigated by optical microscope, infrared spectrometer, thermograviment analyzer (TGA), X-ray diffractometer (XRD), scanning electron microscope (SEM) and universal testing machine, respectively. The results show that the amount of secondary quinoline insoluble in mesophase pitches increase with heat-treatment temperature increase, meanwhile, the cell size of carbon foams increased firstly and then reduced. Moreover, the compressive strength of carbon foams also exhibited the same variation trend. The cellular structure of carbon foam can be severely affected by the secondary quinoline insoluble content of mesophase pitch; thus it is critical to tailor the secondary quinoline insoluble content of mesophase pitch for obtaining carbon foam with high performance.

Heguang Liu; Tiehu Li; Yachun Shi; Xilin Wang; Jing Lv; Wenjuan Zhang

2014-01-01T23:59:59.000Z

387

Process for production of synthesis gas with reduced sulfur content  

DOE Patents (OSTI)

A process for the partial oxidation of a sulfur- and silicate-containing carbonaceous fuel to produce a synthesis gas with reduced sulfur content which comprises partially oxidizing said fuel at a temperature in the range of 1800.degree.-2200.degree. F. in the presence of a temperature moderator, an oxygen-containing gas and a sulfur capture additive which comprises an iron-containing compound portion and a sodium-containing compound portion to produce a synthesis gas comprising H.sub.2 and CO with a reduced sulfur content and a molten slag which comprises (i) a sulfur-containing sodium-iron silicate phase and (ii) a sodium-iron sulfide phase. The sulfur capture additive may optionally comprise a copper-containing compound portion.

Najjar, Mitri S. (Hopewell Junction, NY); Corbeels, Roger J. (Wappingers Falls, NY); Kokturk, Uygur (Wappingers Falls, NY)

1989-01-01T23:59:59.000Z

388

Effect of pressure on the coking yields of coal tar pitches  

Science Journals Connector (OSTI)

Pyrolysis of five coal tar pitches with wide ranging characteristics, made from the same coal tar precursor, has been studied under nitrogen...5, 50×105, 90×105 and 160×105 Pa, at a temperature of 550 °C. The res...

G. Bhatia; R. K. Aggarwal; O. P. Bahl

1992-08-15T23:59:59.000Z

389

Mitigation of Fatigue Loads Using Individual Pitch Control of Wind Turbines Based on FAST  

E-Print Network (OSTI)

Mitigation of Fatigue Loads Using Individual Pitch Control of Wind Turbines Based on FAST Yunqian University, China jiz@seu.edu.cn Abstract-With the increase of wind turbine dimension and capacity, the wind turbine structures are subjected to prominent loads and fatigue which would reduce the lifetime of wind

Chen, Zhe

390

Attitude Stabilization in Hover Flight of a Mini Tail-Sitter UAV with Variable Pitch Propeller  

E-Print Network (OSTI)

Attitude Stabilization in Hover Flight of a Mini Tail-Sitter UAV with Variable Pitch Propeller K-sitters VTOL-UAVs have operational flexibility of typical helicopters while having the cruise performance and development of Unmanned Aerial Vehicles (UAVs) has matured over recent years due to the fact that they can

Paris-Sud XI, Université de

391

Extremely fine-pitch printing with a 10 Schwarzschild optic at extreme ultraviolet wavelengths  

E-Print Network (OSTI)

(NA), all reflective systems. Two-mirror, 10Ã?-demagnification Schwarzschild optical systems have beenExtremely fine-pitch printing with a 10Ã? Schwarzschild optic at extreme ultraviolet wavelengths wavelength, 10Ã?-demagnification Schwarzschild optical system to expose high- resolution test patterns

Bokor, Jeffrey

392

Experimental research on tidal current vertical axis turbine with variable-pitch blades  

Science Journals Connector (OSTI)

Abstract Due to the limited storage and ever-increasing dependence on fossil fuel, the world is in the phase of shifting toward renewable energy. Tidal current energy is one of the most predictable forms of renewable energy, which is harnessed by utilizing a tidal current turbine. To study the performance of the tidal current turbine relating to the ability of energy absorption and exchanging, experimental tests play an important role which can not only validate the numerical results but also provide a reference for the prototype design. In this study, a series of experiments related to vertical-axis turbines (VAT) were carried out at Harbin Engineering University and a large quantity of experimental data to study the hydrodynamic performance of turbines was presented. Based on the different techniques used to control the pitch mechanism, the experiments can be classified as the cycloid type controllable-pitch, spring-control pitch and passive variable-pitch VAT experiment. The influences of the different parameters on the hydrodynamic performance of turbines were discussed. Finally, some control strategies for the blade for different turbines were given.

Fengmei Jing; Qihu Sheng; Liang Zhang

2014-01-01T23:59:59.000Z

393

Pitch cone design and tooth contact analysis of intersected beveloid gears for marine transmission  

Science Journals Connector (OSTI)

Abstract A pitch cone based geometry design method considering line contact is proposed for intersected beveloid gears. The proposed pitch cone design applies the spatial gearing model to determine working pitch cone angles and working spiral angles. For the determination of geometry design parameters, a computer program which incorporates pitch cone design and line contact condition was developed. To illustrate the meshing characteristics, example studies with three groups of geometry parameters were performed by unloaded and loaded tooth contact analysis. Through the analysis, the influences of misalignments, torque load and angle between the first principal directions of the tooth surface curvatures (FPD-angle) on the mesh were investigated. The results show that: compared with axial position errors, shaft angle errors have a more detrimental influence on both the contact path and transmission error. Both FPD-angle and torque load have an obvious effect on this type of gearing. Finally, a practical experimental setup for intersected beveloid gearing with small shaft angle was performed and loaded tooth bearing tests were conducted to demonstrate the proposed design procedure and the theoretical simulation models. The experimental results compared well with the simulation.

Caichao Zhu; Libin Liu; Chaosheng Song; Yixin Xiang; Huaiju Liu

2014-01-01T23:59:59.000Z

394

2007 Nature Publishing Group Self-formation of sub-60-nm half-pitch  

E-Print Network (OSTI)

studies of thin polymer films and termed fracture induced structuring (FIS), self-generates gratings. Specifically, FIS consists of three steps (Fig. 1)12,13. First, a coating of a polymer thin film (for example and cross- sections of FIS gratings. The half-pitch of the FIS grating was found to be as small as 60 nm

395

AN INVESTIGATION OF ACOUSTIC EVENTS RELATED TO SENTENTIAL STRESS AND PITCH ACCENTS, IN ENGLISH  

E-Print Network (OSTI)

. (Pickering, et.al, in press) show that two transcribers select the same prosodic label (level, fall, rise in the utterance and, if the group is accented, the type of pitch movement (level, fall, rise, fall-rise or rise, fall-rise, rise- fall, stressed but unaccented or unstressed) for 72% of syllables. This paper presents

Edinburgh, University of

396

Light-induced pitch transitions in photosensitive cholesteric liquid crystals: Effects of anchoring energy  

E-Print Network (OSTI)

We experimentally study how the cholesteric pitch, $P$, depends on the equilibrium one, $P_0$, in planar liquid crystal (LC) cells with both strong and semistrong anchoring conditions. The cholesteric phase was induced by dissolution in the nematic LC the right-handed chiral dopant 7-DHC (7-dehydrocholesterol, provitamin $D_3$) which transforms to left-handed tachysterol under the action of UV irradiation at the wavelength of 254 nm. By using the model of photoreaction kinetics we obtain dependencies of isomers concentrations and thus the equilibrium pitch on UV irradiation dose. The cholesteric pitch was measured as a function of irradiation time using the polarimetry method. In this method, the pitch is estimated from the experimental data on the irradiation time dependence of the ellipticity of light transmitted through the LC cells. It is found that the resulting dependence of the twist parameter, $2 D/P$ ($D$ is the cell thickness), on the free twisting number parameter, $2 D/P_0$, shows the jump-like behaviour and agrees well with the known theoretical results for the anchoring potential of the Rapini-Papoular form.

Tetiana N. Orlova; Roman I. Iegorov; Alexei D. Kiselev

2013-10-15T23:59:59.000Z

397

CAN HYDROGEN WIN?: EXPLORING SCENARIOS FOR HYDROGEN  

E-Print Network (OSTI)

such as biofuel plug-in hybrids, but did well when biofuels were removed or priced excessively. Hydrogen fuel cells failed unless costs were assumed to descend independent of demand. However, hydrogen vehicles were; Hydrogen as fuel -- Economic aspects; Technological innovations -- Environmental aspects; Climatic changes

398

Hydrogen Pipeline Discussion  

NLE Websites -- All DOE Office Websites (Extended Search)

praxair.com praxair.com Copyright © 2003, Praxair Technology, Inc. All rights reserved. Hydrogen Pipeline Discussion BY Robert Zawierucha, Kang Xu and Gary Koeppel PRAXAIR TECHNOLOGY CENTER TONAWANDA, NEW YORK DOE Hydrogen Pipeline Workshop Augusta, GA August 2005 2 Introduction Regulatory and technical groups that impact hydrogen and hydrogen systems ASME, DOE, DOT etc, Compressed Gas Association activities ASTM TG G1.06.08 Hydrogen pipelines and CGA-5.6 Selected experience and guidance Summary and recommendations 3 CGA Publications Pertinent to Hydrogen G-5: Hydrogen G-5.3: Commodity Specification for Hydrogen G-5.4: Standard for Hydrogen Piping at Consumer Locations G-5.5: Hydrogen Vent Systems G-5.6: Hydrogen Pipeline Systems (IGC Doc 121/04/E) G-5.7: Carbon Monoxide and Syngas

399

Hydrogen | Open Energy Information  

Open Energy Info (EERE)

<-- Back to Hydrogen Gateway <-- Back to Hydrogen Gateway Technical Reference for Hydrogen Compatibility of Materials KIA FCEV SUNRISE MG 7955 6 7.jpg Guidance on materials selection for hydrogen service is needed to support the deployment of hydrogen as a fuel as well as the development of codes and standards for stationary hydrogen use, hydrogen vehicles, refueling stations, and hydrogen transportation. Materials property measurement is needed on deformation, fracture and fatigue of metals in environments relevant to this hydrogen economy infrastructure. The identification of hydrogen-affected material properties such as strength, fracture resistance and fatigue resistance are high priorities to ensure the safe design of load-bearing structures. To support the needs of the hydrogen community, Sandia National

400

Cortical Pitch Regions in Humans Respond Primarily to Resolved Harmonics and Are Located in Specific Tonotopic Regions of Anterior Auditory Cortex  

E-Print Network (OSTI)

Pitch is a defining perceptual property of many real-world sounds, including music and speech. Classically, theories of pitch perception have differentiated between temporal and spectral cues. These cues are rendered ...

Norman-Haignere, Samuel Victo

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Lithium/Sulfur Batteries Based on Doped Mesoporous Carbon - Energy...  

NLE Websites -- All DOE Office Websites (Extended Search)

Materials Advanced Materials Find More Like This Return to Search LithiumSulfur Batteries Based on Doped Mesoporous Carbon Oak Ridge National Laboratory Contact ORNL About...

402

Analyses of sulfur-asphalt field trials in Texas  

E-Print Network (OSTI)

128 LIST OF FIGURES FIGURE PAGF Layout of SNPA sulfur bitumen binder pavem nt test ? U. S. Highway 69, Lufkin, Texas 15 Col 1oi d mi 1 1 furnished by SNPA for preparation of sul fur-asphalt emulsions View of mixing station showing sulfur... designed to investigate the advantage of using a colloid mill to prepare sulfur-asphalt binders as compared to comingling the asphalt and molten sulfur in a pipeline leading directly to the pug mill. After only six months of testing, the results...

Newcomb, David Edward

1979-01-01T23:59:59.000Z

403

Development of sulfur cathode material for Li-S batteries.  

E-Print Network (OSTI)

??M.S. Efforts were taken to fabricate a cathode material having Sulfur as the active material. First step is composed of identifying potential ways of fabricating… (more)

Dharmasena, Ruchira Ravinath, 1984-

2014-01-01T23:59:59.000Z

404

Project Profile: Baseload CSP Generation Integrated with Sulfur...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Related Links FAQs Contact Us Offices You are here Home Concentrating Solar Power Project Profile: Baseload CSP Generation Integrated with Sulfur-Based...

405

Fundamental Studies of Lithium-Sulfur Cell Chemistry  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Studies of Lithium-Sulfur Cell Chemistry PI: Nitash Balsara LBNL June 17, 2014 Project ID ESS224 This presentation does not contain any proprietary, confidential, or otherwise...

406

Abatement of Air Pollution: Control of Sulfur Compound Emissions  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Abatement of Air Pollution: Control of Sulfur Compound Emissions Abatement of Air Pollution: Control of Sulfur Compound Emissions (Connecticut) Abatement of Air Pollution: Control of Sulfur Compound Emissions (Connecticut) < Back Eligibility Agricultural Commercial Construction Fed. Government Fuel Distributor General Public/Consumer Industrial Installer/Contractor Institutional Investor-Owned Utility Local Government Low-Income Residential Multi-Family Residential Municipal/Public Utility Nonprofit Residential Retail Supplier Rural Electric Cooperative Schools State/Provincial Govt Systems Integrator Transportation Tribal Government Utility Program Info State Connecticut Program Type Environmental Regulations Provider Department of Energy and Environmental Protection These regulations set limits on the sulfur content of allowable fuels (1.0%

407

Hydrogen Energy Technology Geoff Dutton  

E-Print Network (OSTI)

Integrated gasification combined cycle (IGCC) Pyrolysis Water electrolysis Reversible fuel cell Hydrogen Hydrogen-fuelled internal combustion engines Hydrogen-fuelled turbines Fuel cells Hydrogen systems Overall expensive. Intermediate paths, employing hydrogen derived from fossil fuel sources, are already used

Watson, Andrew

408

Sulfur removal and comminution of carbonaceous material  

DOE Patents (OSTI)

Finely divided, clean coal or other carbonaceous material is provided by forming a slurry of coarse coal in aqueous alkali solution and heating the slurry under pressure to above the critical conditions of steam. The supercritical fluid penetrates and is trapped in the porosity of the coal as it swells in a thermoplastic condition at elevated temperature. By a sudden, explosive release of pressure the coal is fractured into finely divided particles with release of sulfur-containing gases and minerals. The finely divided coal is recovered from the minerals for use as a clean coal product. 2 figs.

Narain, N.K.; Ruether, J.A.; Smith, D.N.

1987-10-07T23:59:59.000Z

409

Sulfur removal and comminution of carbonaceous material  

DOE Patents (OSTI)

Finely divided, clean coal or other carbonaceous material is provided by forming a slurry of coarse coal in aqueous alkali solution and heating the slurry under pressure to above the critical conditions of steam. The supercritical fluid penetrates and is trapped in the porosity of the coal as it swells in a thermoplastic condition at elevated temperature. By a sudden, explosive release of pressure the coal is fractured into finely divided particles with release of sulfur-containing gases and minerals. The finely divided coal is recovered from the minerals for use as a clean coal product.

Narain, Nand K. (Bethel Park, PA); Ruether, John A. (McMurray, PA); Smith, Dennis N. (Herminie, PA)

1988-01-01T23:59:59.000Z

410

Kinetics of Direct Oxidation of H2S in Coal Gas to Elemental Sulfur  

SciTech Connect

Removal of hydrogen sulfide (H{sub 2}S) from coal gasifier gas and sulfur recovery are key steps in the development of Department of Energy's (DOE's) advanced Vision 21 plants that produce electric power and clean transportation fuels with coal and natural gas. These Vision 21 plants will require highly clean coal gas with H{sub 2}S below 1 ppm and negligible amounts of trace contaminants such as hydrogen chloride, ammonia, alkali, heavy metals, and particulate. The conventional method of sulfur removal and recovery employing amine, Claus, and tail-gas treatment is very expensive. A second generation approach developed under DOE's sponsorship employs hot-gas desulfurization (HGD) using regenerable metal oxide sorbents followed by Direct Sulfur Recovery Process (DSRP). However, this process sequence does not remove trace contaminants and is targeted primarily towards the development of advanced integrated gasification combined cycle (IGCC) plants that produce electricity (not both electricity and transportation fuels). There is an immediate as well as long-term need for the development of cleanup processes that produce highly clean coal gas for next generation Vision 21 plants. To this end, a novel process is now under development at several research organizations in which the H{sub 2}S in coal gas is directly oxidized to elemental sulfur over a selective catalyst. Such a process is ideally suited for coal gas from commercial gasifiers with a quench system to remove essentially all the trace contaminants except H{sub 2}S. The direct oxidation of H{sub 2}S to elemental sulfur in the presence of SO{sub 2} is ideally suited for coal gas from commercial gasifiers with a quench system to remove essentially all the trace contaminants except H{sub 2}S. This direct oxidation process has the potential to produce a super clean coal gas more economically than both conventional amine-based processes and HGD/DSRP. The objectives of this research are to measure kinetics of direct oxidation of H{sub 2}S to elemental sulfur in the presence of a simulated coal gas mixture containing SO{sub 2}, H{sub 2}, and moisture, using 160-{micro}m C-500-04 alumina catalyst particles and 400 square cells/inch{sup 2}, {gamma}-Al{sub 2}O{sub 3}-wash-coated monolithic catalyst, and various reactors such as a micro packed-bed reactor, a micro bubble reactor, and a monolithic catalyst reactor, and to develop kinetic rate equations and model the direct oxidation process to assist in the design of large-scale plants. This heterogeneous catalytic reaction has gaseous reactants such as H{sub 2}S and SO{sub 2}. However, this heterogeneous catalytic reaction has heterogeneous products such as liquid elemental sulfur and steam.

K.C. Kwon

2005-11-01T23:59:59.000Z

411

Sulfur isotopes in coal constrain the evolution of the Phanerozoic sulfur cycle  

Science Journals Connector (OSTI)

...obviously influence the average isotope values. For the other data, samples...pp 87–105 . 19 Price FT Casagrande DJ ( 1991 ) Sulfur...coals. Geology of Fossil Fuels, Proc 30th Int Geol Congress...Jersey Pinelands and its effect on stream water chemistry...223 – 248 . 29 Price FT Shieh YN ( 1979 ) Fractionation...

Donald E. Canfield

2013-01-01T23:59:59.000Z

412

Advanced Byproduct Recovery: Direct Catalytic Reduction of Sulfur Dioxide to Elemental Sulfur.  

SciTech Connect

More than 170 wet scrubber systems applied, to 72,000 MW of U.S., coal-fired, utility boilers are in operation or under construction. In these systems, the sulfur dioxide removed from the boiler flue gas is permanently bound to a sorbent material, such as lime or limestone. The sulfated sorbent must be disposed of as a waste product or, in some cases, sold as a byproduct (e.g. gypsum). Due to the abundance and low cost of naturally occurring gypsum, and the costs associated with producing an industrial quality product, less than 7% of these scrubbers are configured to produce usable gypsum (and only 1% of all units actually sell the byproduct). The disposal of solid waste from each of these scrubbers requires a landfill area of approximately 200 to 400 acres. In the U.S., a total of 19 million tons of disposable FGD byproduct are produced, transported and disposed of in landfills annually. The use of regenerable sorbent technologies has the potential to reduce or eliminate solid waste production, transportation and disposal. In a regenerable sorbent system, the sulfur dioxide in the boiler flue gas is removed by the sorbent in an adsorber. The S0{sub 2}s subsequently released, in higher concentration, in a regenerator. All regenerable systems produce an off-gas stream from the regenerator that must be processed further in order to obtain a salable byproduct, such as elemental sulfur, sulfuric acid or liquid S0{sub 2}.

NONE

1997-06-01T23:59:59.000Z

413

SYNTHESIS OF SULFUR-BASED WATER TREATMENT AGENT FROM SULFUR DIOXIDE WASTE STREAMS  

SciTech Connect

We propose a process that uses sulfur dioxide from coal combustion as a raw material to synthesize polymeric ferric sulfate (PFS), a water treatment agent. The process uses sodium chlorate as an oxidant and ferrous sulfate as an absorbent. The major chemical mechanisms in this reaction system include oxidation, hydrolysis, and polymerization. Oxidation determines sulfur conversion efficiency while hydrolysis and polymerization control the quality of product. Many factors, including SO{sub 2} inlet concentration, flow rate of simulated flue gas, reaction temperature, addition rate of oxidant and stirring rate, may affect the efficiencies of SO{sub 2} removal. Currently, the effects of SO{sub 2} inlet concentration, the flow rate of simulated flue gas and addition rate of flue gas on removal efficiencies of SO{sub 2}, are being investigated. Experiments shown in this report have demonstrated that the conversion efficiencies of sulfur dioxide with ferrous sulfate as an absorbent are in the range of 60-80% under the adopted process conditions. However, the conversion efficiency of sulfur dioxide may be improved by optimizing reaction conditions to be investigated. Partial quality indices of the synthesized products, including Fe{sup 2+} concentration and total iron concentration, have been evaluated.

Robert C. Brown; Maohong Fan

2001-12-01T23:59:59.000Z

414

DOE Permitting Hydrogen Facilities: Hydrogen Fueling Stations  

NLE Websites -- All DOE Office Websites (Extended Search)

Stations Stations Public-use hydrogen fueling stations are very much like gasoline ones. In fact, sometimes, hydrogen and gasoline cars can be fueled at the same station. These stations offer self-service pumps, convenience stores, and other services in high-traffic locations. Photo of a Shell fueling station showing the site convenience store and hydrogen and gasoline fuel pumps. This fueling station in Washington, D.C., provides drivers with both hydrogen and gasoline fuels Many future hydrogen fueling stations will be expansions of existing fueling stations. These facilities will offer hydrogen pumps in addition to gasoline or natural gas pumps. Other hydrogen fueling stations will be "standalone" operations. These stations will be designed and constructed to

415

Hydrogen & Our Energy Future  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydrogen Program Hydrogen Program www.hydrogen.energy.gov Hydrogen & Our Energy Future  | HydrOgEn & Our EnErgy FuturE U.S. Department of Energy Hydrogen Program www.hydrogen.energy.gov u.S. department of Energy |  www.hydrogen.energy.gov Hydrogen & Our Energy Future Contents Introduction ................................................... p.1 Hydrogen - An Overview ................................... p.3 Production ..................................................... p.5 Delivery ....................................................... p.15 Storage ........................................................ p.19 Application and Use ........................................ p.25 Safety, Codes and Standards ............................... p.33

416

Lithium–sulfur batteries: Influence of C-rate, amount of electrolyte and sulfur loading on cycle performance  

Science Journals Connector (OSTI)

Abstract In the past four years major improvement of the lithium sulfur battery technology has been reported. Novel carbon cathode materials offer high sulfur loading, sulfur utilization and cycle stability. An often neglected aspect is that sulfur loading and amount of electrolyte strongly impact the performance. In this paper, we demonstrate how the amount of electrolyte, sulfur loading, lithium excess and cycling rate influences the cycle stability and sulfur utilization. We chose vertically aligned carbon nanotubes (VA-CNT) as model system with a constant areal loading of carbon. For a high reproducibility, decreased weight of current collector and good mechanical adhesion of the VA-CNTs we present a layer transfer technique that enables a light-weight sulfur cathode. The sulfur loading of the cathode was adjusted from 20 to 80 wt.-%. Keeping the total amount of electrolyte constant and varying the C-rate, we are able to demonstrate that the capacity degradation is reduced for high rates, high amount of electrolyte and low sulfur loading. In addition idle periods in the cycling regiment and lower rates result in an increased degradation. We attribute this to the redox-reaction between reactive lithium and polysulfides that correlates with the cycling time, rather than cycle number.

Jan Brückner; Sören Thieme; Hannah Tamara Grossmann; Susanne Dörfler; Holger Althues; Stefan Kaskel

2014-01-01T23:59:59.000Z

417

Hydrogen Compatibility of Materials  

Energy.gov (U.S. Department of Energy (DOE))

Presentation slides from the Energy Department webinar, Hydrogen Compatibility of Materials, held August 13, 2013.

418

Hydrogen Delivery Liquefaction & Compression  

E-Print Network (OSTI)

Hydrogen Delivery Liquefaction & Compression Raymond Drnevich Praxair - Tonawanda, NY Strategic Initiatives for Hydrogen Delivery Workshop - May 7, 2003 #12;2 Agenda Introduction to Praxair Hydrogen Liquefaction Hydrogen Compression #12;3 Praxair at a Glance The largest industrial gas company in North

419

Metallization of fluid hydrogen  

Science Journals Connector (OSTI)

...P. Tunstall Metallization of fluid hydrogen W. J. Nellis 1 A. A. Louis 2 N...The electrical resistivity of liquid hydrogen has been measured at the high dynamic...which structural changes are paramount. hydrogen|metallization of hydrogen|liquid...

1998-01-01T23:59:59.000Z

420

Safetygram #9- Liquid Hydrogen  

Energy.gov (U.S. Department of Energy (DOE))

Hydrogen is colorless as a liquid. Its vapors are colorless, odorless, tasteless, and highly flammable.

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Cu-Pd Hydrogen Separation Membranes with Reduced Palladium Content and Improved Performance  

NLE Websites -- All DOE Office Websites (Extended Search)

Cu-Pd Hydrogen Separation Membranes with Reduced Cu-Pd Hydrogen Separation Membranes with Reduced Palladium Content and Improved Performance Opportunity This patent-pending technology, "Cu-Pd Hydrogen Separation Membranes with Reduced Palladium Content and Improved Performance," consists of copper-palladium alloy compositions for hydrogen separation membranes that use less palladium and have a potential increase in hydrogen permeability and resistance to sulfur degradation compared to currently available copper-palladium membranes. This technology is available for licensing and/or further collaborative research with the U.S. Department of Energy's National Energy Technology Laboratory. Overview NETL is working to help produce and deliver hydrogen from fossil fuels including coal in commercially applicable and environmentally

422

Composition for absorbing hydrogen  

DOE Patents (OSTI)

A hydrogen absorbing composition is described. The composition comprises a porous glass matrix, made by a sol-gel process, having a hydrogen-absorbing material dispersed throughout the matrix. A sol, made from tetraethyl orthosilicate, is mixed with a hydrogen-absorbing material and solidified to form a porous glass matrix with the hydrogen-absorbing material dispersed uniformly throughout the matrix. The glass matrix has pores large enough to allow gases having hydrogen to pass through the matrix, yet small enough to hold the particles dispersed within the matrix so that the hydrogen-absorbing particles are not released during repeated hydrogen absorption/desorption cycles.

Heung, L.K.; Wicks, G.G.; Enz, G.L.

1995-05-02T23:59:59.000Z

423

Hydrogen Storage - Current Technology | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Current on-board hydrogen storage approaches involve compressed hydrogen gas tanks, liquid hydrogen tanks, cryogenic compressed hydrogen, metal hydrides,...

424

Gaseous Hydrogen Delivery Breakout - Strategic Directions for...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Gaseous Hydrogen Delivery Breakout - Strategic Directions for Hydrogen Delivery Workshop Gaseous Hydrogen Delivery Breakout - Strategic Directions for Hydrogen Delivery Workshop...

425

Using ISC & GIS to predict sulfur deposition from coal-fired power plants  

E-Print Network (OSTI)

The goal of this research project was to determine if atmospheric sources have the potential of contributing significantly to the sulfur content of grazed forage. Sulfur deposition resulting from sulfur dioxide emissions from coal- fired power...

Lopez, Jose Ignacio

2012-06-07T23:59:59.000Z

426

FCT Hydrogen Storage: Hydrogen Storage R&D Activities  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydrogen Storage R&D Activities Hydrogen Storage R&D Activities to someone by E-mail Share FCT Hydrogen Storage: Hydrogen Storage R&D Activities on Facebook Tweet about FCT Hydrogen Storage: Hydrogen Storage R&D Activities on Twitter Bookmark FCT Hydrogen Storage: Hydrogen Storage R&D Activities on Google Bookmark FCT Hydrogen Storage: Hydrogen Storage R&D Activities on Delicious Rank FCT Hydrogen Storage: Hydrogen Storage R&D Activities on Digg Find More places to share FCT Hydrogen Storage: Hydrogen Storage R&D Activities on AddThis.com... Home Basics Current Technology DOE R&D Activities National Hydrogen Storage Compressed/Liquid Hydrogen Tanks Testing and Analysis Quick Links Hydrogen Production Hydrogen Delivery Fuel Cells Technology Validation Manufacturing Codes & Standards

427

Final Report for project titled "New fluoroionomer electrolytes with high conductivity and low SO2 crossover for use in electrolyzers being developed for hydrogen production from nuclear power plants"  

SciTech Connect

Thermochemical water splitting cycles, using the heat of nuclear power plants, offer an alternate highly efficient route for the production of hydrogen. Among the many possible thermochemical cycles for the hydrogen production, the sulfur-based cycles lead the competition in overall energy efficiency. A variant on sulfur-based thermochemical cycles is the Hybrid Sulfur (HyS) Process, which uses a sulfur dioxide depolarized electrolyzer (SDE) to produce hydrogen. The Savannah River National Laboratory (SRNL) selected the fuel cell MEA design concept for the SDE in the HyS process since the MEA concept provides a much smaller cell footprint than conventional parallel plate technology. The electrolyzer oxidizes sulfur dioxide to form sulfuric acid at the anode and reduces protons to form hydrogen at the cathode. The overall electrochemical cell reaction consists of the production of H{sub 2}SO{sub 4} and H{sub 2}. There is a significant need to provide the membrane materials that exhibit reduced sulfur dioxide transport characteristics without sacrificing other important properties such as high ionic conductivity and excellent chemical stability in highly concentrated sulfuric acid solutions saturated with sulfur dioxide. As an alternative membrane, sulfonated Perfluorocyclobutyl aromatic ether polymer (sPFCB) were expected to posses low SO2 permeability due to their stiff backbones as well as high proton conductivity, improved mechanical properties. The major accomplishments of this project were the synthesis, characterizations, and optimizations of suitable electrolyzers for good SDE performance and higher chemical stability against sulfuric acid. SDE performance results of developed sPFCB polyelectrolytes have shown that these membranes exhibit good chemical stability against H{sub 2}SO{sub 4}.

Dennis W. Smith; Stephen Creager

2012-09-13T23:59:59.000Z

428

Integrated boiler, superheater, and decomposer for sulfuric acid decomposition  

DOE Patents (OSTI)

A method and apparatus, constructed of ceramics and other corrosion resistant materials, for decomposing sulfuric acid into sulfur dioxide, oxygen and water using an integrated boiler, superheater, and decomposer unit comprising a bayonet-type, dual-tube, counter-flow heat exchanger with a catalytic insert and a central baffle to increase recuperation efficiency.

Moore, Robert (Edgewood, NM); Pickard, Paul S. (Albuquerque, NM); Parma, Jr., Edward J. (Albuquerque, NM); Vernon, Milton E. (Albuquerque, NM); Gelbard, Fred (Albuquerque, NM); Lenard, Roger X. (Edgewood, NM)

2010-01-12T23:59:59.000Z

429

HEALTH AND CLIMATE POLICY IMPACTS ON SULFUR EMISSION CONTROL  

E-Print Network (OSTI)

the climate and health effects of sulfate aerosol into an integrated-assessment model of fossil fuel emission warming and health simultaneously will support more stringent fossil fuel and sulfur controls control. Our simulations show that a policy that adjusts fossil fuel and sulfur emissions to address both

Russell, Lynn

430

The effect of rhenium, sulfur and alumina on the conversion of hydrocarbons over platinum single crystals: Surface science and catalytic studies  

SciTech Connect

Conversion reactions of hydrocarbons over Pt-Re model catalyst surfaces modified by sulfur and alumina have been studied. A plasma deposition source has been developed to deposit Pt, Re, and Al on metal substrates variable coverage in ultrahigh vacuum without excessive heating. Conversion of n-hexane was performed over the Re-covered Pt and Pt-covered Re surfaces. The presence of the second metal increased hydrogenolysis activity of both Pt-Re surfaces. Addition of sulfur on the model Catalyst surfaces suppressed hydrogenolysis activity and increased the cyclization rate of n-hexane to methylcyclopentane over Pt-Re surfaces. Sulfiding also increased the dehydrogenation rate of cyclohexane to benzene Over Pt-Re surfaces. It has been proposed that the PtRe bimetallic catalysts show unique properties when combined with sulfur, and electronic interactions exist between platinum, rhenium and sulfur. Decomposition of hydrocarbons on the sulfur-covered Pt-Re surfaces supported that argument. For the conversion of 1-butene over the planar Pt/AlO{sub x}, the addition of Pt increased the selectivity of hydrogenation over isomerization.

Kim, C.

1992-04-01T23:59:59.000Z

431

The effect of rhenium, sulfur and alumina on the conversion of hydrocarbons over platinum single crystals: Surface science and catalytic studies  

SciTech Connect

Conversion reactions of hydrocarbons over Pt-Re model catalyst surfaces modified by sulfur and alumina have been studied. A plasma deposition source has been developed to deposit Pt, Re, and Al on metal substrates variable coverage in ultrahigh vacuum without excessive heating. Conversion of n-hexane was performed over the Re-covered Pt and Pt-covered Re surfaces. The presence of the second metal increased hydrogenolysis activity of both Pt-Re surfaces. Addition of sulfur on the model Catalyst surfaces suppressed hydrogenolysis activity and increased the cyclization rate of n-hexane to methylcyclopentane over Pt-Re surfaces. Sulfiding also increased the dehydrogenation rate of cyclohexane to benzene Over Pt-Re surfaces. It has been proposed that the PtRe bimetallic catalysts show unique properties when combined with sulfur, and electronic interactions exist between platinum, rhenium and sulfur. Decomposition of hydrocarbons on the sulfur-covered Pt-Re surfaces supported that argument. For the conversion of 1-butene over the planar Pt/AlO[sub x], the addition of Pt increased the selectivity of hydrogenation over isomerization.

Kim, C.

1992-04-01T23:59:59.000Z

432

DOE Hydrogen Analysis Repository: Hydrogen Modeling Projects  

NLE Websites -- All DOE Office Websites (Extended Search)

Modeling Projects Modeling Projects Below are models grouped by topic. These models are used to analyze hydrogen technology, infrastructure, and other areas related to the development and use of hydrogen. Cross-Cutting Distributed Energy Resources Customer Adoption Model (DER_CAM) Hydrogen Deployment System (HyDS) Model and Analysis Hydrogen Technology Assessment and Selection Model (HyTASM) Renewable Energy Power System Modular Simulator (RPM-Sim) Stranded Biogas Decision Tool for Fuel Cell Co-Production Energy Infrastructure All Modular Industry Growth Assessment (AMIGA) Model Building Energy Optimization (BEopt) Distributed Energy Resources Customer Adoption Model (DER_CAM) Hydrogen Deployment System (HyDS) Model and Analysis Hydrogen Technology Assessment and Selection Model (HyTASM)

433

Metal-sulfur type cell having improved positive electrode  

DOE Patents (OSTI)

An novel metal-sulfur type cell operable at a temperature of 200.degree. C. or less with an energy density of 150 Whrs/Kg or better is disclosed characterized by an organo-sulfur cathode formed from an organic-sulfur compound having the general formula, in its charged state, of (R(S).sub.y).sub.n wherein y=1 to 6; n=2 to 20; and R is one or more different aliphatic or aromatic organic moieties having 1 to 20 carbon atoms, which may include one or more oxygen, sulfur, or nitrogen heteroatoms when R comprisises one of more aromatic rings, or one or more oxygen, sulfur, nitrogen, or fluorine atoms associtated with the chain when R comprises an aliphatic chain, wherein the aliphatic group may be linear or branched, saturated or unsaturated, and wherein either the aliphatic chain or the aromatic ring may have substituted groups thereon.

Dejonghe, Lutgard C. (Berkeley, CA); Visco, Steven J. (Berkeley, CA); Mailhe, Catherine C. (Berkeley, CA); Armand, Michel B. (St. Martin D'Uriage, FR)

1989-01-01T23:59:59.000Z

434

DOE Hydrogen and Fuel Cells Program: Hydrogen Analysis Resource Center  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydrogen Production Hydrogen Production Hydrogen Delivery Hydrogen Storage Hydrogen Manufacturing Fuel Cells Applications/Technology Validation Safety Codes and Standards Education Basic Research Systems Analysis Analysis Repository H2A Analysis Hydrogen Analysis Resource Center Scenario Analysis Well-to-Wheels Analysis Systems Integration U.S. Department of Energy Search help Home > Systems Analysis > Hydrogen Analysis Resource Center Printable Version Hydrogen Analysis Resource Center The Hydrogen Analysis Resource Center provides consistent and transparent data that can serve as the basis for hydrogen-related calculations, modeling, and other analytical activities. This new site features the Hydrogen Data Book with data pertinent to hydrogen infrastructure analysis; links to external databases related to

435

Hydrogen Permeability and Integrity of Hydrogen Delivery Pipelines...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

of hydrogen permeation behavior and its impact on hydrogen embrittlement of pipeline steels under high gaseous pressures relevant to hydrogen gas transmission pipeline...

436

Bulk Hydrogen Storage - Strategic Directions for Hydrogen Delivery...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Bulk Hydrogen Storage Strategic Directions for Hydrogen Delivery Workshop May 7-8, 2003 Crystal City, Virginia Breakout Session - Bulk Hydrogen Storage Main ThemesCaveats Bulk...

437

Hydrogen Supply: Cost Estimate for Hydrogen Pathways-Scoping...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Supply: Cost Estimate for Hydrogen Pathways-Scoping Analysis. January 22, 2002-July 22, 2002 Hydrogen Supply: Cost Estimate for Hydrogen Pathways-Scoping Analysis. January 22,...

438

NREL: Hydrogen and Fuel Cells Research - Hydrogen Storage  

NLE Websites -- All DOE Office Websites (Extended Search)

L. Simpson. (2010) Contact: Thomas Gennett 303-384-6628 Printable Version Hydrogen & Fuel Cells Research Home Projects Fuel Cells Hydrogen Production & Delivery Hydrogen Storage...

439

DOE Hydrogen and Fuel Cells Program Record 5037: Hydrogen Storage...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

5037: Hydrogen Storage Materials - 2004 vs. 2006 DOE Hydrogen and Fuel Cells Program Record 5037: Hydrogen Storage Materials - 2004 vs. 2006 This program record from the Department...

440

Hydrogen Delivery Technologies and Systems- Pipeline Transmission of Hydrogen  

Energy.gov (U.S. Department of Energy (DOE))

Hydrogen Delivery Technologies and Systems - Pipeline Transmission of Hydrogen. Design and operations standards and materials for hydrogen and natural gas pipelines.

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Carbon/Sulfur Nanocomposites and Additives for High-Energy Lithium...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

May 2011 CarbonSulfur Nanocomposites and Additives for High-Energy Lithium Sulfur Batteries "This presentation does not contain any proprietary, confidential, or otherwise...

442

E-Print Network 3.0 - amoco sulfur recovery process Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

and Medicine 80 Sulfur and oxygen isotope composition of the atmosphere in Saxony (Germany) Tichomirowa et al. Summary: ? a) Mixing processes 12;Sulfur and oxygen isotope...

443

Charge Sharing Effect on 600 ?m Pitch Pixelated CZT Detector for Imaging Applications  

E-Print Network (OSTI)

We are currently investigating the spatial resolution of highly pixelated Cadmium Zinc Telluride (CZT) detector for imaging applications. A 20 mm {\\times} 20 mm {\\times} 5 mm CZT substrate was fabricated with 600 {\\mu}m pitch pixels (500 {\\mu}m anode pixels with 100 {\\mu}m gap) and coplanar cathode. Charge sharing between two pixels was studied using collimated 122 keV gamma ray source. Experiments show a resolution of 125 {\\mu}m FWHM for double-pixel charge sharing events when the 600 {\\mu}m pixelated and 5 mm thick CZT detector biased at -1000 V. In addition, we analyzed the energy response of the 600 {\\mu}m pitch pixelated CZT detector.

Yongzhi Yin; Qi Liu; Dapeng Xu; Ximeng Chen

2013-12-24T23:59:59.000Z

444

Charge Sharing Effect on 600 {\\mu}m Pitch Pixelated CZT Detector for Imaging Applications  

E-Print Network (OSTI)

We are currently investigating the spatial resolution of highly pixelated Cadmium Zinc Telluride (CZT) detector for imaging applications. A 20 mm {\\times} 20 mm {\\times} 5 mm CZT substrate was fabricated with 600 {\\mu}m pitch pixels (500 {\\mu}m anode pixels with 100 {\\mu}m gap) and coplanar cathode. Charge sharing between two pixels was studied using collimated 122 keV gamma ray source. Experiments show a resolution of 125 {\\mu}m FWHM for double-pixel charge sharing events when the 600 {\\mu}m pixelated and 5 mm thick CZT detector biased at -1000 V. In addition, we analyzed the energy response of the 600 {\\mu}m pitch pixelated CZT detector.

Yin, Yongzhi; Xu, Dapeng; Chen, Ximeng

2013-01-01T23:59:59.000Z

445

Effect of nanosilicon carbide on the carbonisation process of coal tar pitch  

Science Journals Connector (OSTI)

Abstract The study describes the effect of silicon carbide (SiC) nanopowder on the process of coal tar pitch thermal decomposition during heat treatment to a temperature of 2000 °C. The influence of nanosized SiC powder on the pyrolysis mechanism of carbonisation product yield, as well as structural and microstructural parameters of carbon obtained via carbonisation and further heating up to 2000 °C was studied. The results show that the incorporation of a suitable amount of ceramic nanopowder into the liquid coal tar pitch results in a decrease in the crystallite sizes of carbon residue, while further heating up to 2000 °C gives rise to two carbon phases, differing in crystallinity and interplanar distance between graphene layers. The SiC addition enhances the formation of well-ordered graphite domains in comparison with those present within a pure carbon matrix.

Danuta Mikociak; Anna Magiera; Grzegorz Labojko; Stanislaw Blazewicz

2014-01-01T23:59:59.000Z

446

Why Hydrogen? Hydrogen from Diverse Domestic Resources  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

produce hydrogen in a centralized coal based operation for .79kg at the plant gate with carbon sequestration. Develop advanced OTM, HTM, technology, advanced reforming and shift...

447

Resource Assessment for Hydrogen Production: Hydrogen Production...  

NLE Websites -- All DOE Office Websites (Extended Search)

Administration ERR Estimated Recoverable Reserves FCEV fuel cell electric vehicle GHG greenhouse gas GW gigawatt GWh gigawatt-hour GWdt gigawatt-days thermal H2A Hydrogen...

448

Leading Edge Flow Structure of a Dynamically Pitching NACA 0012 Airfoil  

E-Print Network (OSTI)

LEADING EDGE FLOW STRUCTURE OF A DYNAMICALLY PITCHING NACA 0012 AIRFOIL A Thesis by BRANDON JAMES PRUSKI Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements for the degree of MASTER... OF SCIENCE Approved by: Chair of Committee, Rodney Bowersox Committee Members, Helen Reed Simon North Head of Department, Rodney Bowersox December 2012 Major Subject: Aerospace Engineering Copyright 2012 Brandon James Pruski ABSTRACT The leading edge...

Pruski, Brandon

2012-11-27T23:59:59.000Z

449

Oxygen addition to sulfur of metal thiolates  

E-Print Network (OSTI)

, and characterized. Molecular oxygen or hydrogen peroxide reacted with (N,N'-bis(mercaptoethyl)-1,5-diazacyclooctane-nickel(II), (BME-DACO)2Ni3 +2, to produce a trimetallic, (N,N'-bismercaptoethyl-1,5-diazacyclooctane-nickel(II))-nickelate, (BME-DACO)2Ni3 2...

Soma, Takako

2012-06-07T23:59:59.000Z

450

Hydrogen storage gets new hope  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydrogen storage gets new hope Hydrogen storage gets new hope A new method for "recycling" hydrogen-containing fuel materials could open the door to economically viable...

451

The Bumpy Road to Hydrogen  

E-Print Network (OSTI)

will trump hydrogen and fuel cell vehicles. Advocates ofbenefits sooner than hydrogen and fuel cells ever could.emissions from a hydrogen fuel cell vehicle will be about

Sperling, Dan; Ogden, Joan M

2006-01-01T23:59:59.000Z

452

High pressure sulfuric acid decomposition experiments for the sulfur-iodine thermochemical cycle.  

SciTech Connect

A series of three pressurized sulfuric acid decomposition tests were performed to (1) obtain data on the fraction of sulfuric acid catalytically converted to sulfur dioxide, oxygen, and water as a function of temperature and pressure, (2) demonstrate real-time measurements of acid conversion for use as process control, (3) obtain multiple measurements of conversion as a function of temperature within a single experiment, and (4) assess rapid quenching to minimize corrosion of metallic components by undecomposed acid. All four of these objectives were successfully accomplished. This report documents the completion of the NHI milestone on high pressure H{sub 2}SO{sub 4} decomposition tests for the Sulfur-Iodine (SI) thermochemical cycle project. All heated sections of the apparatus, (i.e. the boiler, decomposer, and condenser) were fabricated from Hastelloy C276. A ceramic acid injection tube and a ceramic-sheathed thermocouple were used to minimize corrosion of hot liquid acid on the boiler surfaces. Negligible fracturing of the platinum on zirconia catalyst was observed in the high temperature decomposer. Temperature measurements at the exit of the decomposer and at the entry of the condenser indicated that the hot acid vapors were rapidly quenched from about 400 C to less than 20 C within a 14 cm length of the flow path. Real-time gas flow rate measurements of the decomposition products provided a direct measurement of acid conversion. Pressure in the apparatus was preset by a pressure-relief valve that worked well at controlling the system pressure. However, these valves sometimes underwent abrupt transitions that resulted in rapidly varying gas flow rates with concomitant variations in the acid conversion fraction.

Velasquez, Carlos E; Reay, Andrew R.; Andazola, James C.; Naranjo, Gerald E.; Gelbard, Fred

2005-09-01T23:59:59.000Z

453

The Milli-Motein: A self-folding chain of programmable matter with a one centimeter module pitch  

E-Print Network (OSTI)

The Milli-Motein (Millimeter-Scale Motorized Protein) is ca chain of programmable matter with a 1 cm pitch. It can fold itself into digitized approximations of arbitrary three-dimensional shapes. The small size of the ...

Knaian, Ara N.

454

Performance and cost models for the direct sulfur recovery process. Task 1 Topical report, Volume 3  

SciTech Connect

The purpose of this project is to develop performance and cost models of the Direct Sulfur Recovery Process (DSRP). The DSRP is an emerging technology for sulfur recovery from advanced power generation technologies such as Integrated Gasification Combined Cycle (IGCC) systems. In IGCC systems, sulfur present in the coal is captured by gas cleanup technologies to avoid creating emissions of sulfur dioxide to the atmosphere. The sulfur that is separated from the coal gas stream must be collected. Leading options for dealing with the sulfur include byproduct recovery as either sulfur or sulfuric acid. Sulfur is a preferred byproduct, because it is easier to handle and therefore does not depend as strongly upon the location of potential customers as is the case for sulfuric acid. This report describes the need for new sulfur recovery technologies.

Frey, H.C. [North Carolina State Univ., Raleigh, NC (United States); Williams, R.B. [Carneigie Mellon Univ., Pittsburgh, PA (United States)

1995-09-01T23:59:59.000Z

455

FCT Hydrogen Production: Hydrogen Production R&D Activities  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydrogen Production R&D Hydrogen Production R&D Activities to someone by E-mail Share FCT Hydrogen Production: Hydrogen Production R&D Activities on Facebook Tweet about FCT Hydrogen Production: Hydrogen Production R&D Activities on Twitter Bookmark FCT Hydrogen Production: Hydrogen Production R&D Activities on Google Bookmark FCT Hydrogen Production: Hydrogen Production R&D Activities on Delicious Rank FCT Hydrogen Production: Hydrogen Production R&D Activities on Digg Find More places to share FCT Hydrogen Production: Hydrogen Production R&D Activities on AddThis.com... Home Basics Current Technology R&D Activities Quick Links Hydrogen Delivery Hydrogen Storage Fuel Cells Technology Validation Manufacturing Codes & Standards Education Systems Analysis Contacts

456

Catalyzed Hydrogen Spillover for Hydrogen Storage  

Science Journals Connector (OSTI)

Catalyzed Hydrogen Spillover for Hydrogen Storage ... Storing sufficient H on-board a wide range of vehicle platforms, while meeting all consumer requirements (driving range, cost, safety, performance, etc.), without compromising passenger or cargo space, is a tremendous tech. ... The authors show that for the 1st time significant amts. of H can be stored in MOF-5 and IRMOF-8 at ambient temp. ...

Ralph T. Yang; Yuhe Wang

2009-02-27T23:59:59.000Z

457

Hydrogen Permeability and Integrity of Hydrogen  

E-Print Network (OSTI)

· To develop suitable welding technology for H2 pipeline construction and repair · To develop technical basisHydrogen Permeability and Integrity of Hydrogen Delivery Pipelines Z. Feng*, L.M. Anovitz*, J pressure permeation test · Edison Welding Institute - Pipeline materials · Lincoln Electric Company

458

Gaseous Hydrogen Delivery Breakout- Strategic Directions for Hydrogen Delivery Workshop  

Energy.gov (U.S. Department of Energy (DOE))

Targets, barriers and research and development priorities for gaseous delivery of hydrogen through hydrogen and natural gas pipelines.

459

Molten iron oxysulfide as a superior sulfur sorbent. Final report, [September 1989--1993  

SciTech Connect

The studies had as original objective the analysis of conditions for using liquid iron oxysulfide as a desulfuring agent during coal gasification. Ancillary was a comparison of iron oxysulfide with lime as sorbents under conditions where lime reacts with S-bearing gases to form Ca sulfate or sulfide. Primary thrust is to determine the thermodynamic requirements for desulfurization by iron additions (e.g., taconite concentrate) during combustion in gasifiers operating at high equivalence ratios. Thermodynamic analysis of lime-oxygen-sulfur system shows why lime is injected into burners under oxidizing conditions; reducing conditions forms CaS, requiring its removal, otherwise oxidation and release of S would occur. Iron as the oxysulfide liquid has a range of stability and can be used as a desulfurizing agent, if the burner/gasifier operates in a sufficiently reducing regime (high equivalence ratio); this operating range is given and is calculable for a coal composition, temperature, stoichiometry. High moisture or hydrogen contents of the coal yield a poorer degree of desulfurization. Kinetic tests on individual iron oxide particles on substrates or Pt cups with a TGA apparatus fail to predict reaction rates within a burner. Preliminary tests on the Dynamic Containment Burner with acetylene give some promise that this system can produce the proper conditions of coal gasification for use of added iron as a sulfur sorbent.

Hepworth, M.T.

1993-03-31T23:59:59.000Z

460

BP and Hydrogen Pipelines  

NLE Websites -- All DOE Office Websites (Extended Search)

BP and Hydrogen Pipelines BP and Hydrogen Pipelines DOE Hydrogen Pipeline Working Group Workshop August 30-31, 2005 Gary P. Yoho, P.E. i l i * Green corporate philosophy and senior management commitment * Reduced greenhouse gas emissions nine years ahead of target * Alternatives to oil are a big part of BP' including natural gas, LNG, solar and hydrogen * Hydrogen Bus Project won Australia' prestigious environmental award * UK partnership opened the first hydrogen demonstration refueling station * Two hydrogen pipelines in Houston area BP Env ronmenta Comm tment s portfolio, s most BP' * li l " li i i * i l pl i i * Li l li l * " i i l i 2 i i ll i i l pl ifi i * 8" ly idl i i l s Hydrogen Pipelines Two nes, on y a brand new 12 ne s act ve Connect Houston area chem ca ant w th a ref nery nes come off a p

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Hydrogen Production- Current Technology  

Energy.gov (U.S. Department of Energy (DOE))

The development of clean, sustainable, and cost-competitive hydrogen production processes is key to a viable future clean energy economy. Hydrogen production technologies fall into three general...

462

A Hydrogen Economy  

Science Journals Connector (OSTI)

The history of the “hydrogen economy” may be broken down into three parts ... is the history of the founding of the Hydrogen Energy Society which took place in Miami,...

J. O’M. Bockris

1981-01-01T23:59:59.000Z

463

Solar Hydrogen Production  

Science Journals Connector (OSTI)

The common methods of hydrogen production impose many concerns regarding the decline in...2...emission, and ecological impacts. Subsequently, all the downstream industries that consume hydrogen involve the aforem...

Ibrahim Dincer; Anand S. Joshi

2013-01-01T23:59:59.000Z

464

Hydrogen Fuel Quality (Presentation)  

SciTech Connect

Jim Ohi of NREL's presentation on Hydrogen Fuel Quality at the 2007 DOE Hydrogen Program Annual Merit Review and Peer Evaluation on May 15-18, 2007 in Arlington, Virginia.

Ohi, J.

2007-05-17T23:59:59.000Z

465

Effects of reactive element additions and sulfur removal on the oxidation behavior of FECRAL alloys  

SciTech Connect

The results of this study have shown that desulfurization of FeCrAl alloys by hydrogen annealing can result in improvements in cyclic oxidation comparable to that achieved by doping with reactive elements. Moreover, specimens of substantial thicknesses can be effectively desulfurized because of the high diffusivity of sulfur in bcc iron alloys. The results have also shown that there is less stress generation during the cyclic oxidation of Y-doped FeCrAl compared to Ti-doped or desulfurized FeCrAl. This indicates that the growth mechanism, as well as the strength of the oxide/alloy interface, influences the ultimate oxidation morphology and stress state which will certainly affect the length of time the alumina remains protective.

Stasik, M.C.; Pettit, F.S.; Meier, G.H. (Univ. of Pittsburgh, PA (United States). Dept. of Materials Science and Engineering); Ashary, A. (Praxair, Indianapolis, IN (United States)); Smialek, J.L. (NASA Lewis Research Center, Cleveland, OH (United States))

1994-12-15T23:59:59.000Z

466

Webinar: Hydrogen Refueling Protocols  

Energy.gov (U.S. Department of Energy (DOE))

Video recording and text version of the webinar titled, Hydrogen Refueling Protocols, originally presented on February 22, 2013.

467

The Hydrogen Economy  

Science Journals Connector (OSTI)

Before describing the characteristics of an economy in which hydrogen is the medium of energy, let us...

J. O’M. Bockris; Z. Nagy

1974-01-01T23:59:59.000Z

468

Hydrogen Technologies Safety Guide  

SciTech Connect

The purpose of this guide is to provide basic background information on hydrogen technologies. It is intended to provide project developers, code officials, and other interested parties the background information to be able to put hydrogen safety in context. For example, code officials reviewing permit applications for hydrogen projects will get an understanding of the industrial history of hydrogen, basic safety concerns, and safety requirements.

Rivkin, C.; Burgess, R.; Buttner, W.

2015-01-01T23:59:59.000Z

469

National Hydrogen Energy Roadmap  

Energy.gov (U.S. Department of Energy (DOE))

This roadmap provides a blueprint for the coordinated, long-term, public and private efforts required for hydrogen energy development.

470

Hydrogenation of Magnesium Nickel Boride for Reversible Hydrogen Storage  

Science Journals Connector (OSTI)

Hydrogenation of Magnesium Nickel Boride for Reversible Hydrogen Storage ... Use of hydrogen for transportation applications requires materials that not only store hydrogen at high density but that can operate reversibly at temperatures and pressures below approximately 100 °C and 10 bar, respectively. ... This composition is based on assuming the following complete hydrogenation reaction:which stores 2.6 wt % hydrogen. ...

Wen Li; John J. Vajo; Robert W. Cumberland; Ping Liu; Son-Jong Hwang; Chul Kim; Robert C. Bowman, Jr.

2009-11-06T23:59:59.000Z

471

Terpolymerization of ethylene, sulfur dioxide and carbon monoxide  

DOE Patents (OSTI)

This invention relates to a high molecular weight terpolymer of ethylene, sulfur dioxide and carbon monoxide stable to 280.degree. C. and containing as little as 36 mol % ethylene and about 41-51 mol % sulfur dioxide; and to the method of producing said terpolymer by irradiation of a liquid and gaseous mixture of ethylene, sulfur dioxide and carbon monoxide by means of Co-60 gamma rays or an electron beam, at a temperature of about 10.degree.-50.degree. C., and at a pressure of about 140 to 680 atmospheres, to initiate polymerization.

Johnson, Richard (Shirley, NY); Steinberg, Meyer (Huntington Station, NY)

1981-01-01T23:59:59.000Z

472

Gaseous Hydrogen Delivery Breakout  

E-Print Network (OSTI)

or reduce the likelihood of hydrogen embrittlement Test existing high strength steel alloys for use in largeGaseous Hydrogen Delivery Breakout Strategic Directions for Hydrogen Delivery Workshop May 7 compression. Safety, integrity, reliability: Metal embrittlement, no H2 odorant, low ignition energy

473

Hydrogen Delivery Liquefaction and Compression  

Energy.gov (U.S. Department of Energy (DOE))

Hydrogen Delivery Liquefaction and Compression - Overview of commercial hydrogen liquefaction and compression and opportunities to improve efficiencies and reduce cost.

474

New Materials for Hydrogen Pipelines  

Energy.gov (U.S. Department of Energy (DOE))

Barriers to Hydrogen Delivery: Existing steel pipelines are subject to hydrogen embrittlement and are inadequate for widespread H2 distribution.

475

Hydrogen separation process  

DOE Patents (OSTI)

A method for separating a hydrogen-rich product stream from a feed stream comprising hydrogen and at least one carbon-containing gas, comprising feeding the feed stream, at an inlet pressure greater than atmospheric pressure and a temperature greater than 200.degree. C., to a hydrogen separation membrane system comprising a membrane that is selectively permeable to hydrogen, and producing a hydrogen-rich permeate product stream on the permeate side of the membrane and a carbon dioxide-rich product raffinate stream on the raffinate side of the membrane. A method for separating a hydrogen-rich product stream from a feed stream comprising hydrogen and at least one carbon-containing gas, comprising feeding the feed stream, at an inlet pressure greater than atmospheric pressure and a temperature greater than 200.degree. C., to an integrated water gas shift/hydrogen separation membrane system wherein the hydrogen separation membrane system comprises a membrane that is selectively permeable to hydrogen, and producing a hydrogen-rich permeate product stream on the permeate side of the membrane and a carbon dioxide-rich product raffinate stream on the raffinate side of the membrane. A method for pretreating a membrane, comprising: heating the membrane to a desired operating temperature and desired feed pressure in a flow of inert gas for a sufficient time to cause the membrane to mechanically deform; decreasing the feed pressure to approximately ambient pressure; and optionally, flowing an oxidizing agent across the membrane before, during, or after deformation of the membrane. A method of supporting a hydrogen separation membrane system comprising selecting a hydrogen separation membrane system comprising one or more catalyst outer layers deposited on a hydrogen transport membrane layer and sealing the hydrogen separation membrane system to a porous support.

Mundschau, Michael (Longmont, CO); Xie, Xiaobing (Foster City, CA); Evenson, IV, Carl (Lafayette, CO); Grimmer, Paul (Longmont, CO); Wright, Harold (Longmont, CO)

2011-05-24T23:59:59.000Z

476

Low Temperature Sorbents for removal of Sulfur Compounds from fluid feed Streams  

SciTech Connect

A sorbent material is provided comprising a material reactive with sulfur, a binder unreactive with sulfur and an inert material, wherein the sorbent absorbs the sulfur at temperatures between 30 and 200 C. Sulfur absorption capacity as high as 22 weight percent has been observed with these materials.

Siriwardane, Ranjan

1999-09-30T23:59:59.000Z

477

Low Temperature Sorbents for Removal of Sulfur Compounds from Fluid Feed Streams  

DOE Patents (OSTI)

A sorbent material is provided comprising a material reactive with sulfur, a binder unreactive with sulfur and an inert material, wherein the sorbent absorbs the sulfur at temperatures between 30 and 200 C. Sulfur absorption capacity as high as 22 weight percent has been observed with these materials.

Siriwardane, Ranjani

2004-06-01T23:59:59.000Z

478

Hydrogenation of aromatics in synthetic crude distillates catalyzed by platinum supported in molecular sieves  

SciTech Connect

Catalytic hydrogenation of synthetic crude distillates from Canadian oil sands was carried out over platinum metal supported in pillared interlayered clay (PILC) and Y-zeolite. The molecular sieve supports were employed to modify the properties of dispersed platinum particles and improve their resistance to poisoning by sulfur. The objective was to reduce the distillate aromatic content to meet diesel emission control standards and cetane number requirements. Catalysts were prepared in a series of steps, and metal precursor was loaded using ion-exchange procedures. Characterization was done using X-ray diffraction, hydrogen chemisorption, and proton-induced X-ray emission elemental analysis. Catalytic hydrogenation reactions were carried out by processing distillate feedstocks both high (>100 ppm) and low (<10 ppm) in sulfur using a continuous-flow automated microreactor system. Experimental runs were performed to determine the reaction kinetics and Arrhenius parameters as a means of evaluating and comparing catalyst performance. Significant differences in catalyst activity were found. The Pt/Y-zeolite-alumina catalyst showed a much superior hydrogenation performance under conditions of high sulfur content. The extent of cracking and ring opening was also evaluated and was shown to be minimal under the operating conditions employed.

Kimbara, N.; Charland, J.P. [CANMET, Ottawa, Ontario (Canada)] [CANMET, Ottawa, Ontario (Canada); Wilson, M.F. [CANMET, Devon, Alberta (Canada)] [CANMET, Devon, Alberta (Canada)

1996-11-01T23:59:59.000Z

479

Anti-Hydrogen Jonny Martinez  

E-Print Network (OSTI)

Anti-Hydrogen Jonny Martinez University of California, Berkeley #12;OUTLINE WHAT IS ANTI-HYDROGEN? HISTORY IMPORTANCE THEORY HOW TO MAKE ANTI-HYDROGEN OTHER ANTI-MATTER EXPERIMENTS CONCLUSION #12;WHAT IS ANTI-HYDROGEN? Anti-hydrogen is composed of a Positron(anti-electron) and anti-Proton. Anti-Hydrogen

Budker, Dmitry

480

System for adding sulfur to a fuel cell stack system for improved fuel cell stability  

DOE Patents (OSTI)

A system for adding sulfur to a reformate stream feeding a fuel cell stack, having a sulfur source for providing sulfur to the reformate stream and a metering device in fluid connection with the sulfur source and the reformate stream. The metering device injects sulfur from the sulfur source to the reformate stream at a predetermined rate, thereby providing a conditioned reformate stream to the fuel cell stack. The system provides a conditioned reformate stream having a predetermined sulfur concentration that gives an acceptable balance of minimal drop in initial power with the desired maximum stability of operation over prolonged periods for the fuel cell stack.

Mukerjee, Subhasish; Haltiner, Jr., Karl J; Weissman, Jeffrey G

2013-08-13T23:59:59.000Z

Note: This page contains sample records for the topic "hydrogen pitch sulfur" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Sulfur behavior in chemical looping combustion with NiO/Al{sub 2}O{sub 3} oxygen carrier  

SciTech Connect

Chemical looping combustion (CLC) is a novel technology where CO{sub 2} is inherently separated during combustion. Due to the existence of sulfur contaminants in the fossil fuels, the gaseous products of sulfur species and the interaction of sulfur contaminants with oxygen carrier are a big concern in the CLC practice. The reactivity of NiO/Al{sub 2}O{sub 3} oxygen carrier reduction with a gas mixture of CO/H{sub 2} and H{sub 2}S is investigated by means of a thermogravimetric analyzer (TGA) and Fourier Transform Infrared spectrum analyzer in this study. An X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscope (SEM) are used to evaluate the phase characterization of reacted oxygen carrier, and the formation mechanisms of the gaseous products of sulfur species are elucidated in the process of chemical looping combustion with a gaseous fuel containing hydrogen sulfide. The results show that the rate of NiO reduction with H{sub 2}S is higher than the one with CO. There are only Ni and Ni{sub 3}S{sub 2} phases of nickel species in the fully reduced oxygen carrier, and no evidence for the existence of NiS or NiS{sub 2}. The formation of Ni{sub 3}S{sub 2} is completely reversible during the process of oxygen carrier redox. A liquid phase sintering on the external surface of reduced oxygen carriers is mainly attributed to the production of the low melting of Ni{sub 3}S{sub 2} in the nickel-based oxygen carrier reduction with a gaseous fuel containing H{sub 2}S. Due to the sintering of metallic nickel grains on the external surface of the reduced oxygen carrier, further reaction of the oxygen carrier with H{sub 2}S is constrained, and there is no increase of the sulfidation index of the reduced oxygen carrier with the cyclical reduction number. Also, a continuous operation with a syngas of carbon monoxide and hydrogen containing H{sub 2}S is carried out in a 1 kW{sub th} CLC prototype based on the nickel-based oxygen carrier, and the effect of the fuel reactor temperature on the release of gaseous products of sulfur species is investigated. (author)

Shen, Laihong; Gao, Zhengping; Wu, Jiahua; Xiao, Jun [Thermoenergy Engineering Research Institute, Southeast University, Nanjing 210096 (China)

2010-05-15T23:59:59.000Z

482

Martinez Sulfuric Acid Regeneration Plt Biomass Facility | Open Energy  

Open Energy Info (EERE)

Martinez Sulfuric Acid Regeneration Plt Biomass Facility Martinez Sulfuric Acid Regeneration Plt Biomass Facility Jump to: navigation, search Name Martinez Sulfuric Acid Regeneration Plt Biomass Facility Facility Martinez Sulfuric Acid Regeneration Plt Sector Biomass Facility Type Non-Fossil Waste Location Contra Costa County, California Coordinates 37.8534093°, -121.9017954° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":37.8534093,"lon":-121.9017954,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

483

Diesel Emissions Control-Sulfur Effects (DECSE) Program Status  

SciTech Connect

Determine the impact of fuel sulfur levels on emission control systems that could be implemented to lower emissions of NO{sub x} and PM from on-highway trucks in the 2002-2004 time frame.

None

1999-06-29T23:59:59.000Z

484

Hybrid Microfabricated Device for Field Measurement of Atmospheric Sulfur Dioxide  

Science Journals Connector (OSTI)

It is also now generally agreed that forthcoming major volcanic eruptions will sensitively monitored for increasing sulfur gas emissions as indicated by increasing seismic activity. ... (12)?Fish, B. R.; Durham, J. L. Environ. ...

Shin-Ichi Ohira; Kei Toda; Shin-Ichiro Ikebe; Purnendu K. Dasgupta

2002-10-10T23:59:59.000Z

485

Sulfur meter for blending coal at Plant Monroe: Final report  

SciTech Connect

An on-line sulfur analyzer, installed at the Detroit Edison, Monroe Power station, was placed into service and evaluated for coal blending optimization to minimize the cost of complying with changing stack gas sulfur dioxide regulations. The project involved debugging the system which consisted of an /open quotes/as-fired/close quotes/ sampler and nuclear source sulfur analyzer. The system was initially plagued with mechanical and electronic problems ranging from coal flow pluggages to calibration drifts in the analyzer. Considerable efforts were successfully made to make the system reliable and accurate. On-line testing showed a major improvement in control of sulfur dioxide emission rates and fuel blending optimization equivalent to as much as $6 million in fuel costs at the time of the evaluation. 7 refs., 14 figs., 12 tabs.

Trentacosta, S.D.; Yurko, J.O.

1988-04-01T23:59:59.000Z

486

Hydrogen peroxide safety issues  

SciTech Connect

A literature survey was conducted to review the safety issues involved in handling hydrogen peroxide solutions. Most of the information found in the literature is not directly applicable to conditions at the Rocky Flats Plant, but one report describes experimental work conducted previously at Rocky Flats to determine decomposition reaction-rate constants for hydrogen peroxide solutions. Data from this report were used to calculate decomposition half-life times for hydrogen peroxide in solutions containing several decomposition catalysts. The information developed from this survey indicates that hydrogen peroxide will undergo both homogeneous and heterogeneous decomposition. The rate of decomposition is affected by temperature and the presence of catalytic agents. Decomposition of hydrogen peroxide is catalyzed by alkalies, strong acids, platinum group and transition metals, and dissolved salts of transition metals. Depending upon conditions, the consequence of a hydrogen peroxide decomposition can range from slow evolution of oxygen gas to a vapor, phase detonation of hydrogen peroxide vapors.

Conner, W.V.

1993-04-14T23:59:59.000Z

487

Hydrogen Use and Safety  

NLE Websites -- All DOE Office Websites (Extended Search)

USE AND SAFETY USE AND SAFETY The lightest and most common element in the universe, hydrogen has been safely used for decades in industrial applications. Currently, over 9 million tons of hydrogen are produced in the U.S. each year and 3.2 trillion cubic feet are used to make many common products. They include glass, margarine, soap, vitamins, peanut butter, toothpaste and almost all metal products. Hydrogen has been used as a fuel since the 1950s by the National Aeronautics & Space Administration (NASA) in the U.S. space program. Hydrogen - A Safe, Clean Fuel for Vehicles Hydrogen has another use - one that can help our nation reduce its consumption of fossil fuels. Hydrogen can be used to power fuel cell vehicles. When combined with oxygen in a fuel cell, hydrogen generates electricity used

488

ADVANCED BYPRODUCT RECOVERY: DIRECT CATALYTIC REDUCTION OF SO2 TO ELEMENTAL SULFUR  

SciTech Connect

Arthur D. Little, Inc., together with its commercialization partner, Engelhard Corporation, and its university partner Tufts, investigated a single-step process for direct, catalytic reduction of sulfur dioxide from regenerable flue gas desulfurization processes to the more valuable elemental sulfur by-product. This development built on recently demonstrated SO{sub 2}-reduction catalyst performance at Tufts University on a DOE-sponsored program and is, in principle, applicable to processing of regenerator off-gases from all regenerable SO{sub 2}-control processes. In this program, laboratory-scale catalyst optimization work at Tufts was combined with supported catalyst formulation work at Engelhard, bench-scale supported catalyst testing at Arthur D. Little and market assessments, also by Arthur D. Little. Objectives included identification and performance evaluation of a catalyst which is robust and flexible with regard to choice of reducing gas. The catalyst formulation was improved significantly over the course of this work owing to the identification of a number of underlying phenomena that tended to reduce catalyst selectivity. The most promising catalysts discovered in the bench-scale tests at Tufts were transformed into monolith-supported catalysts at Engelhard. These catalyst samples were tested at larger scale at Arthur D. Little, where the laboratory-scale results were confirmed, namely that the catalysts do effectively reduce sulfur dioxide to elemental sulfur when operated under appropriate levels of conversion and in conditions that do not contain too much water or hydrogen. Ways to overcome those limitations were suggested by the laboratory results. Nonetheless, at the end of Phase I, the catalysts did not exhibit the very stringent levels of activity or selectivity that would have permitted ready scale-up to pilot or commercial operation. Therefore, we chose not to pursue Phase II of this work which would have included further bench-scale testing, scale-up, pilot-scale (0.5 MW{sub e}) testing at conditions representative of various regenerable SO{sub 2}-control systems, preparation of a commercial process design, and development of a utility-scale demonstration plan.

Robert S. Weber

1999-05-01T23:59:59.000Z

489

Selective catalytic reduction of sulfur dioxide to elemental sulfur. Final report  

SciTech Connect

This project has investigated new metal oxide catalysts for the single stage selective reduction of SO{sub 2} to elemental sulfur by a reductant, such as CO. Significant progress in catalyst development has been made during the course of the project. We have found that fluorite oxides, CeO{sub 2} and ZrO{sub 2}, and rare earth zirconates such as Gd{sub 2}Zr{sub 2}O{sub 7} are active and stable catalysts for reduction Of SO{sub 2} by CO. More than 95% sulfur yield was achieved at reaction temperatures about 450{degrees}C or higher with the feed gas of stoichiometric composition. Reaction of SO{sub 2} and CO over these catalysts demonstrated a strong correlation of catalytic activity with the catalyst oxygen mobility. Furthermore, the catalytic activity and resistance to H{sub 2}O and CO{sub 2} poisoning of these catalysts were significantly enhanced by adding small amounts of transition metals, such as Co, Ni, Co, etc. The resulting transition metal-fluorite oxide composite catalyst has superior activity and stability, and shows promise in long use for the development of a greatly simplified single-step sulfur recovery process to treat variable and dilute SO{sub 2} concentration gas streams. Among various active composite catalyst systems the Cu-CeO{sub 2} system has been extensively studied. XRD, XPS, and STEM analyses of the used Cu-CeO{sub 2} catalyst found that the fluorite crystal structure of ceria was stable at the present reaction conditions, small amounts of copper was dispersed and stabilized on the ceria matrix, and excess copper oxide particles formed copper sulfide crystals of little contribution to catalytic activity. A working catalyst consisted of partially sulfated cerium oxide surface and partially sulfided copper clusters. The overall reaction kinetics were approximately represented by a first order equation.

Liu, W.; Flytzani-Stephanopoulos, M.; Sarofim, A.F.

1995-06-01T23:59:59.000Z

490

Low temperature fracture evaluation of plasticized sulfur paving mixtures  

E-Print Network (OSTI)

May 1985 Major Subject: Civil Engineering LOW TEMPERATURE FRACTURE EVALUATION OF PLASTICIZED SULFUR PAVING MIXTURES A Thesis by KAMYAR MAHBOUB Approved as to style and content by: Dallas N. Li tie (Chai rman of Committee) Ro e . Lytto Member... modifications to the standard ASTM procedure. These modifications were required due to the nature of plasticized sulfur mixtures and asphalt cement mixtures. The J-integral version of Paris ' law was successfully used to characterize the fatigue...

Mahboub, Kamyar

2012-06-07T23:59:59.000Z

491

Microstructure and Corrosion Behavior of the Cu-Pd-X Ternary Alloys for Hydrogen Separation Membranes  

SciTech Connect

CuPd alloys are among the most promising candidate materials for hydrogen separation membranes and membrane reactor applications due to their high hydrogen permeability and better sulfur resistance. In order to reduce the Pd content and, therefore, the cost of the membrane materials, efforts have been initiated to develop CuPdM ternary alloys having a bcc structure. The advantages of having Pd as a hydrogen separation membrane are: (1) high hydrogen selectivity; and (2) high hydrogen permeability. The disadvantages are: (1) high cost; (2) hydrogen embrittlement ({alpha} {yields} {beta} Pd hydride); and (3) sulfur poisoning. Experiments (XRD, SEM/EDS) verified that Mg, Al, La, Y and Ti are promising alloying elements to expand the B2 phase region in Cu-Pd binary system. HT-XRD showed that the B2 to FCC transition temperatures for Cu-Pd-X (X = Mg, Al, La, Y and Ti) are higher than that of Cu-Pd binary alloys. While the Cu-50Pd alloy had the highest corrosion resistance to the H2S containing syngas, the Cu-Pd-Mg alloy had a comparable resistance.

O.N. Dogan; M.C. Gao; B.H. Howard

2012-02-26T23:59:59.000Z

492

Recent advances in lithium–sulfur batteries  

Science Journals Connector (OSTI)

Abstract Lithium–sulfur (Li–S) batteries have attracted much attention lately because they have very high theoretical specific energy (2500 Wh kg?1), five times higher than that of the commercial LiCoO2/graphite batteries. As a result, they are strong contenders for next-generation energy storage in the areas of portable electronics, electric vehicles, and storage systems for renewable energy such as wind power and solar energy. However, poor cycling life and low capacity retention are main factors limiting their commercialization. To date, a large number of electrode and electrolyte materials to address these challenges have been investigated. In this review, we present the latest fundamental studies and technological development of various nanostructured cathode materials for Li–S batteries, including their preparation approaches, structure, morphology and battery performance. Furthermore, the development of other significant components of Li–S batteries including anodes, electrolytes, additives, binders and separators are also highlighted. Not only does the intention of our review article comprise the summary of recent advances in Li–S cells, but also we cover some of our proposals for engineering of Li–S cell configurations. These systematic discussion and proposed directions can enlighten ideas and offer avenues in the rational design of durable and high performance Li–S batteries in the near future.

Lin Chen; Leon L. Shaw

2014-01-01T23:59:59.000Z

493

Effects of grit roughness and pitch oscillations on the S810 airfoil  

SciTech Connect

An S810 airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory 3 x 5 subsonic wind tunnel under steady state and unsteady conditions. The test defined baseline conditions for steady state angles of attack from -20{degrees} to +40{degrees} and examined unsteady behavior by oscillating the model about its pitch axis for three mean angles, three frequencies, and two amplitudes. For all cases, Reynolds numbers of 0.75, 1, 1.25, and 1.5 million were used. In addition, the above conditions were repeated after the application of leading edge grit roughness (LEGR) to determine contamination effects on the airfoil performance. Baseline steady state results of the S810 testing showed a maximum lift coefficient of 1.15 at 15.2{degrees}angle of attack. The application of LEGR reduced the maximum lift coefficient by 12% and increased the 0.0085 minimum drag coefficient value by 88%. The zero lift pitching moment of -0.0286 showed a 16% reduction in magnitude to -0.0241 with LEGR applied. Data were also obtained for two pitch oscillation amplitudes: {plus_minus}5.5{degrees} and {plus_minus}10{degrees}. The larger amplitude consistently gave a higher maximum lift coefficient than the smaller amplitude and both sets of unsteady maximum lift coefficients were greater than the steady state values. Stall was delayed on the airfoil while the angle of attack was increasing, thereby causing an increase in maximum lift coefficient. A hysteresis behavior was exhibited for all the unsteady test cases. The hysteresis loops were larger for the higher reduced frequencies and for the larger amplitude oscillations. In addition to the hysteresis behavior, an unusual feature of these data were a sudden increase in the lift coefficient where the onset of stall was expected. As in the steady case, the effect of LEGR in the unsteady case was to reduce the lift coefficient at high angles of attack.

Ramsay, R.R.; Hoffman, M.J.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1996-01-01T23:59:59.000Z

494

Effects of grit roughness and pitch oscillations on the NACA 4415 airfoil  

SciTech Connect

A NACA 4415 airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory 3 x 5 subsonic wind tunnel under steady state and unsteady conditions. The test defined baseline conditions for steady state angles of attack from {minus}10{degree} to +40{degree} and examined unsteady behavior by oscillating the model about its pitch axis for three mean angles, three frequencies, and two amplitudes. For all cases, Reynolds numbers of 0.75, 1, 1.25, and 1.5 million were used. In addition, these were repeated after the application of leading edge grit roughness (LEGR) to determine contamination effects on the airfoil performance. Steady state results of the NACA 4415 testing at Reynolds number of 1.25 million showed a baseline maximum lift coefficient of 1.30 at 12.3{degree} angle of attack. The application of LEGR reduced the maximum lift coefficient by 20% and increased the 0.0090 minimum drag coefficient value by 62%. The zero lift pitching moment of {minus}0.0967 showed a 13% reduction in magnitude to {minus}0.0842 with LEGR applied. Data were also obtained for two pitch oscillation amplitudes: {+-}5.5{degree} and {+-}10{degree}. The larger amplitude consistently gave a higher maximum lift coefficient than the smaller amplitude, and both unsteady maximum lift coefficients were greater than the steady state values. Stall is delayed on the airfoil while the angle of attack is increasing, thereby causing an increase in maximum lift coefficient. A hysteresis behavior was exhibited for all the unsteady test cases. The hysteresis loops were larger for the higher reduced frequencies and for the larger amplitude oscillations. As in the steady case, the effect of LEGR in the unsteady case was to reduce the lift coefficient at high angles of attack. In addition, with LEGR, the hysteresis behavior persisted into lower angles of attack than for the clean case.

Hoffmann, M.J.; Reuss Ramsay, R.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1996-07-01T23:59:59.000Z

495

DOE Hydrogen Analysis Repository: Hydrogen Production by  

NLE Websites -- All DOE Office Websites (Extended Search)

Production by Photovoltaic-powered Electrolysis Production by Photovoltaic-powered Electrolysis Project Summary Full Title: Production of Hydrogen by Photovoltaic-powered Electrolysis Project ID: 91 Principal Investigator: D.L. Block Keywords: Hydrogen production; electrolysis; photovoltaic (PV) Purpose To evaluate hydrogen production from photovoltaic (PV)-powered electrolysis. Performer Principal Investigator: D.L. Block Organization: Florida Solar Energy Center Address: 1679 Clearlake Road Cocoa, FL 32922 Telephone: 321-638-1001 Email: block@fsec.ucf.edu Sponsor(s) Name: Michael Ashworth Organization: Florida Energy Office Name: Neil Rossmeissl Organization: DOE/Advanced Utilities Concepts Division Name: H.T. Everett Organization: NASA/Kennedy Space Center Project Description Type of Project: Analysis Category: Hydrogen Fuel Pathways

496

Hydrogen Material Compatibility for Hydrogen ICE | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Merit Review and Peer Evaluation Meeting, May 18-22, 2009 -- Washington D.C. pm04smith.pdf More Documents & Publications Hydrogen Materials Compatibility for the H-ICE...

497

Pitch-based carbon foam heat sink with phase change material  

DOE Patents (OSTI)

A process for producing a carbon foam heat sink is disclosed which obviates the need for conventional oxidative stabilization. The process employs mesophase or isotropic pitch and a simplified process using a single mold. The foam has a relatively uniform distribution of pore sizes and a highly aligned graphic structure in the struts. The foam material can be made into a composite which is useful in high temperature sandwich panels for both thermal and structural applications. The foam is encased and filled with a phase change material to provide a very efficient heat sink device.

Klett, James W. (Knoxville, TN); Burchell, Timothy D. (Oak Ridge, TN)

2002-01-01T23:59:59.000Z

498

Pitch-based carbon foam heat sink with phase change material  

DOE Patents (OSTI)

A process for producing a carbon foam heat sink is disclosed which obviates the need for conventional oxidative stabilization. The process employs mesophase or isotropic pitch and a simplified process using a single mold. The foam has a relatively uniform distribution of pore sizes and a highly aligned graphic structure in the struts. The foam material can be made into a composite which is useful in high temperature sandwich panels for both thermal and structural applications. The foam is encased and filled with a phase change material to provide a very efficient heat sink device.

Klett, James W. (Knoxville, TN); Burchell, Timothy D. (Oak Ridge, TN)

2000-01-01T23:59:59.000Z

499

HYBRID SULFUR ELECTROLYZER DEVELOPMENT, NHI WORK PACKAGE N-SR07TC0301, FY07 FIRST QUARTER REPORT  

SciTech Connect

The proof of concept of SO2 electrolysis for the hybrid sulfur (HyS) process is the second priority research target of the DOE Nuclear Hydrogen Initiative's thermochemical program for FY07. The proof of concept of the liquid-phase option must be demonstrated at the single cell level for an extended run times (>100 hours). The rate of development of HyS will depend on the identification of a promising membrane or an alternative means for controlling sulfur formation. Once successful long-duration operation has been demonstrated, SRNL will develop a multi-cell stack that can be connected to the H2SO4 decomposer being developed by SNL for the S-I ILS for a Hybrid Sulfur Integrated Laboratory-Scale Experiment during FY 2008. During the first quarter of FY07, SRNL continued the component development and membrane development activities with the goal of identifying and characterizing improved electrodes, electrocatalysts, membranes and MEA configurations which could then be tested at larger scale in the SDE test facility. A modified glass cell was fabricated to allow measurements of sulfur dioxide (SO2) transport across membrane samples at elevated temperatures (up to 70 C). This testing also includes evaluating SO2 transport in different sulfuric acid concentrations (30-70 wt%). A new potentiostat/frequency analyzer was installed for determining ionic conductivity of membranes. This instrument enhances our capabilities to characterize membrane, electrocatalyst and MEA properties and performance. Continuing work from FY06, evaluations were preformed on various commercial and experimental membranes and electrocatalyst materials for the SDE. Several different types of commercially-available membranes were analyzed for sulfur dioxide transport as a function of acid strength including perfluorinated sulfonic acid (PFSA), sulfonated polyetherketone-ketone, and poly-benzimidazole (PBI) membranes. Experimental membranes from the sulfonated diels-alder polyphenylenes (SDAPP) and modified Nafion{reg_sign} 117 were evaluated for SO{sub 2} transport as well. These membranes exhibited reduced transport coefficient for SO{sub 2} transport without the loss in ionic conductivity.

Summers, W

2006-12-20T23:59:59.000Z

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Polyaniline-modified cetyltrimethylammonium bromide-graphene oxide-sulfur nanocomposites with enhanced performance for lithium-sulfur batteries  

Science Journals Connector (OSTI)

Conductive polymer coatings can boost the power storage capacity of lithium-sulfur batteries. We report here on the design and ... polyaniline (PANI)-modified cetyltrimethylammonium bromide (CTAB)-graphene oxide ...

Yongcai Qiu; Wanfei Li; Guizhu Li; Yuan Hou; Lisha Zhou; Hongfei Li…

2014-09-01T23:59:59.000Z