Fundamental studies of catalytic gasification: Quarterly report, October 1, 1986-December 31, 1986
This program studies the basic chemistry of the reaction of carbonaceous materials with water in the presence of catalysts to produce hydrogen and/or synthesis gas. Relatively low temperatures are being used. The catalysts under investigation are compounds of potassium and a transition metal oxide. Major objectives are the extension of the work from chars to coke; the effect of H/sub 2/, CO and CO/sub 2/ partial pressure on the gaseous product distribution; and the inhibition of catalyst poisoning by ash components. Some of the highlights are: (1) Activation energies for K/Ni catalyzed steam gasification of graphite and of chars are identical, indicating the same mechanism prevails though rates are much higher for chars. This permits extrapolation of findings in high vacuum equipment from graphite to chars. (2) The CO/CO/sub 2/ ratio of gases produced along with hydrogen varies with different chars. The ratio is 0.8 for Illinois No. 6 char and 0.08 for North Dakota char. Methane production is several orders of magnitude smaller and ceases after about 2 hours. (3) Comparison of K/Ni catalyst for steam gasification of Illinois No. 6 char with K or Ni alone indicates: (a) K alone produces much higher CO/CO/sub 2/ ratios than K/Ni. (b) Ni alone is almost inactive for the steam gasification of Illinois No. 6 except for the short first period of operation. (4) Montana char treated with aqua regia to remove ash components prior to impregnation with K/Ni has 75% of the activity of untreated char but exhibits little deactivation with time so that it gasifies better than untreated char after a few hours. (5) Controlled atmosphere electron microscopy studies have been extended to wet hydrogen and wet oxygen treatments of K/Ni impregnated graphite 3 refs., 8 figs., 2 tabs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 7053348
- Report Number(s):
- LBL-22682; ON: DE87007891
- Country of Publication:
- United States
- Language:
- English
Similar Records
Catalytic gasification of graphite or carbon. Annual report, October 1, 1984-September 30, 1985
Catalytic gasification of graphite or carbon. Quarterly report, January 1-March 31, 1985
Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
ACTIVATION ENERGY
ALKALI METALS
AQUA REGIA
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHARS
CHEMICAL COMPOSITION
CHEMISTRY
COAL GASIFICATION
DATA
DEACTIVATION
DEASHING
ELECTRON MICROSCOPY
ELEMENTAL MINERALS
ELEMENTS
ENERGY
EXPERIMENTAL DATA
GASIFICATION
GRAPHITE
HIGH TEMPERATURE
INFORMATION
MEDIUM PRESSURE
METALS
MICROSCOPY
MINERALS
NICKEL
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
POTASSIUM
PYROLYSIS PRODUCTS
RESEARCH PROGRAMS
STEAM
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS