Catalytic gasification of graphite or carbon. Annual report, October 1, 1984-September 30, 1985

Technical Report · Sun Sep 01 04:00:00 EDT 1985

OSTI ID:6292075

Heinemann, H

Highlights for this quarter are: (1) In the gasification of graphite over KOH/NiO catalysts at 860K, more hydrogen and less CO and methane are observed than corresponds to equilibrium. CO2 is a major product, along with hydrogen. (2) A char derived from Illinois No. 6 coal was gasified after impregnation with KOH-NiO. The gasification with steam resulted in almost identical results with those obtained from graphite. The char gave larger amounts of methane (about 1% of gas products) than graphite at gasification temperatures of up to 900K. (3) Nickel is a good gasification catalyst, but it is rapidly poisoned in graphite gasification. Nickel oxide alone is not a catalyst for gasification, but mixtures of NiO and KOH are and are greatly superior to either KOH or Ni alone. (4) The gasification rate of both graphite and char in the presence of KOH/NiO appears to be independent of steam partial pressure in the range tested. (5) To determine whether methane is a major primary product which is then decomposed by steam reforming, methane was added to the steam feed. The vast majority (95+%) of the added methane was recovered in the product, showing that steam reforming plays at most a minor role. However, in the presence of added methane the gasification rate declined. While the reasons for this are not yet clear, they must lie in a surface poisoning by some decomposition product of the small amounts of methane disappearance. Addition of hydrogen to the steam feed caused about a 25% decrease in the rate of gas production as did the addition of CO2 instead of hydrogen. (6) Addition of CO to the steam feed to KOH-NiO impregnated graphite resulted in a 25% increase in the rate of gasification. (7) Adsorption-desorption experiments on graphite using labelled CO, CO2 and H2O have been carried out. If CO is adsorbed at room temperature most of it is desorbed at relatively low temperature (450K). 12 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6292075
• Report Number(s): LBL-20325; ON: DE86005842
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ADSORPTION
ALKALI METAL COMPOUNDS
ALKANES
BINDING ENERGY
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHARS
CHEMICAL REACTORS
DATA
DEACTIVATION
DESORPTION
ELEMENTAL MINERALS
ELEMENTS
ENERGY
EXPERIMENTAL DATA
GASIFICATION
GRAPHITE
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
MASS SPECTRA
METALS
METHANE
MINERALS
NICKEL
NICKEL COMPOUNDS
NICKEL OXIDES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
PYROLYSIS PRODUCTS
RESEARCH PROGRAMS
SORPTION
SORPTIVE PROPERTIES
SPECTRA
STEAM
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WATER