Fundamental studies of catalytic gasification: Quarterly report, January 1, 1989--March 31, 1989. [K-Ni and K-Ca catalysts]
This program has investigated the role of catalysts in relatively low temperature steam gasification. New mechanisms have been demonstrated and it has been shown that combinations of alkali hydroxide with transition metal oxides form compounds which act as the true catalyst to produce mostly hydrogen and carbon dioxide. Most of the mechanistic work has been done with graphite as a pure source of carbon. A number of chars with different ash contents and ash compositions have been gasified at relatively low temperatures (/approximately/800K). There is a major effect of the ash content on the catalyst. In some cases catalysts are being rapidly deactivated by ash components while in other cases gasification is promoted by ash. Demineralized chars can be gasified at low temperature with the potassium-nickel catalyst without appreciable deactivation. More recently it has been found that combinations of alkali and earth alkali catalysts, for instance mixtures of potassium and calcium oxides, are excellent gasification catalyst that cannot easily be poisoned by ash components. These catalysts are also considerably less expensive than transition metal compound containing materials. 12 figs., 2 tabs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6134089
- Report Number(s):
- LBL-26891; ON: DE89012834
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METALS
ALKALINE EARTH METALS
ASH CONTENT
CALCIUM
CARBON
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
COAL GASIFICATION
DEACTIVATION
DEMINERALIZATION
DOCUMENT TYPES
ELEMENTAL MINERALS
ELEMENTS
GASIFICATION
GRAPHITE
HETEROCYCLIC COMPOUNDS
IRON COMPOUNDS
IRON SULFIDES
KINETICS
METALS
MINERALS
NICKEL
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
POTASSIUM
PROGRESS REPORT
PYRITE
PYROLYSIS PRODUCTS
REACTION KINETICS
SEPARATION PROCESSES
STEAM
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
THIOPHENE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS