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Title: Zinc-oxide-based sorbents and processes for preparing and using same

Abstract

Zinc oxide-based sorbents, and processes for preparing and using them are provided. The sorbents are preferably used to remove one or more reduced sulfur species from gas streams. The sorbents comprise an active zinc component, optionally in combination with one or more promoter components and/or one or more substantially inert components. The active zinc component is a two phase material, consisting essentially of a zinc oxide (ZnO) phase and a zinc aluminate (ZnAl.sub.2O.sub.4) phase. Each of the two phases is characterized by a relatively small crystallite size of typically less than about 500 Angstroms. Preferably the sorbents are prepared by converting a precursor mixture, comprising a precipitated zinc oxide precursor and a precipitated aluminum oxide precursor, to the two-phase, active zinc oxide containing component.

Inventors:
 [1];  [2];  [2]
  1. (Cary, NC)
  2. (Durham, NC)
Publication Date:
Research Org.:
Research Triangle Institute (Research Triangle Park, NC)
Sponsoring Org.:
USDOE
OSTI Identifier:
1014473
Patent Number(s):
7,682,423
Application Number:
US Patent Application 11/771,364
Assignee:
Research Triangle Institute (Research Triangle Park, NC) NETL
DOE Contract Number:
AC26-99FT40675
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Gangwal, Santosh Kumar, Turk, Brian Scott, and Gupta, Raghubir Prasael. Zinc-oxide-based sorbents and processes for preparing and using same. United States: N. p., 2010. Web.
Gangwal, Santosh Kumar, Turk, Brian Scott, & Gupta, Raghubir Prasael. Zinc-oxide-based sorbents and processes for preparing and using same. United States.
Gangwal, Santosh Kumar, Turk, Brian Scott, and Gupta, Raghubir Prasael. Tue . "Zinc-oxide-based sorbents and processes for preparing and using same". United States. doi:. https://www.osti.gov/servlets/purl/1014473.
@article{osti_1014473,
title = {Zinc-oxide-based sorbents and processes for preparing and using same},
author = {Gangwal, Santosh Kumar and Turk, Brian Scott and Gupta, Raghubir Prasael},
abstractNote = {Zinc oxide-based sorbents, and processes for preparing and using them are provided. The sorbents are preferably used to remove one or more reduced sulfur species from gas streams. The sorbents comprise an active zinc component, optionally in combination with one or more promoter components and/or one or more substantially inert components. The active zinc component is a two phase material, consisting essentially of a zinc oxide (ZnO) phase and a zinc aluminate (ZnAl.sub.2O.sub.4) phase. Each of the two phases is characterized by a relatively small crystallite size of typically less than about 500 Angstroms. Preferably the sorbents are prepared by converting a precursor mixture, comprising a precipitated zinc oxide precursor and a precipitated aluminum oxide precursor, to the two-phase, active zinc oxide containing component.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 23 00:00:00 EDT 2010},
month = {Tue Mar 23 00:00:00 EDT 2010}
}

Patent:

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  • Zinc oxide-based sorbents, and processes for preparing and using them are provided. The sorbents are preferably used to remove one or more reduced sulfur species from gas streams. The sorbents comprise an active zinc component, optionally in combination with one or more promoter components and/or one or more substantially inert components. The active zinc component is a two phase material, consisting essentially of a zinc oxide (ZnO) phase and a zinc aluminate (ZnAl.sub.2O.sub.4) phase. Each of the two phases is characterized by a relatively small crystallite size of typically less than about 500 Angstroms. Preferably the sorbents are prepared bymore » converting a precursor mixture, comprising a precipitated zinc oxide precursor and a precipitated aluminum oxide precursor, to the two-phase, active zinc oxide containing component.« less
  • Zinc oxide-based sorbents, and processes for preparing and using them are provided, wherein the sorbents are preferably used to remove one or more reduced sulfur species from gas streams. The sorbents contain an active zinc component, optionally in combination with one or more promoter components and/or one or more substantially inert components. The active zinc component is a two phase material, consisting essentially of a zinc oxide (ZnO) phase and a zinc aluminate (ZnAl.sub.2 O.sub.4) phase. Each of the two phases is characterized by a relatively small crystallite size of typically less than about 500 Angstroms. Preferably the sorbents aremore » prepared by converting a precursor mixture, containing a precipitated zinc oxide precursor and a precipitated aluminum oxide precursor, to the two-phase, active zinc oxide containing component.« less
  • The disclosure relates to zinc oxide-based sorbents, and processes for preparing and using them. The sorbents are preferably used to remove one or more reduced sulfur species from gas streams. The sorbents comprise an active zinc component, optionally in combination with one or more promoter components and/or one or more substantially inert components. The active zinc component is a two phase material, consisting essentially of a zinc oxide (ZnO) phase and a zinc aluminate (ZnAl.sub.2O.sub.4) phase. Each of the two phases is characterized by a relatively small crystallite size of typically less than about 500 Angstroms. Preferably the sorbents aremore » prepared by converting a precursor mixture, comprising a precipitated zinc oxide precursor and a precipitated aluminum oxide precursor, to the two-phase, active zinc oxide containing component.« less
  • An attrition resistant precipitated bulk iron catalyst is prepared from iron oxide precursor and a binder by spray drying. The catalysts are preferably used in carbon monoxide hydrogenation processes such as Fischer-Tropsch synthesis. These catalysts are suitable for use in fluidized-bed reactors, transport reactors and, especially, slurry bubble column reactors.
  • A superconductor material having a current density, J, of from about 30,000 to about 85,000 amps/cm{sup 2} at zero magnetic field and 77 K is disclosed. The 123 superconductor, of the formula L{sub 1}Ba{sub 2}Cu{sub 3}O{sub 6+{delta}} wherein L is preferably yttrium, is capable of entrapping sufficiently high magnetic fields and exhibits a low microwave surface resistance. The process of preparing the superconductor comprises compacting the bulk product, L{sub 1}Ba{sub 2}Cu{sub 3}O, and then sintering the reaction product at a temperature between about 40 C to about 90 C below its melting point, i.e., for Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 6+{delta}}more » at a temperature of approximately 940 C. The composition is then heated in a preheated chamber maintained at approximately 1090 C to about 1,200 C (approximately 1,100 C for Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 6+{delta}}) until it has been decomposed, and is then rapidly cooled to a temperature between about 10 C to about 30 C above its melting point, i.e. for Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 6+{delta}} a temperature of 1,030 C, and then is controlled cooled at a rate of 1 C/hr until it reaches a temperature of about 20 C to about 40 C below its melting point, i.e., for Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 6+{delta}} a temperature of 980 C. The composition is steadily held at this temperature for at least eight hours, and then cooled to a temperature of approximately 400 C below its melting point (for Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 6+{delta}} approximately a temperature of 600 C). The material is then slowly cooled by another 200 C and is then annealed in oxygen. 5 figs.« less