Transition metal-graphite catalysts for production of light hydrocarbons from synthesis gas. Annual report, August 1, 1976--July 31, 1977. [Sodium-graphite (C/sub 64/Na); potassium-graphite (C/sub 8/K); iron--graphite (potassium-reduced); iron-graphite (Sodium Aryl reducer)]
Sodium- and potassium-graphite intercalates, although possessing high initial activities for the Fischer-Tropsch synthesis, do not behave catalytically for this reaction. A large fraction of carbon monoxide reactant becomes unreactively adsorbed on these materials, probably via formation of stable carbonyl-type structures, and inhibits the overall reaction rate. Furthermore, a permanent and irrecoverable loss of activity occurs after only brief usage, due to alkali metal destruction by the water molecules that are necessarily formed during reaction. With only minor variations, the behavior of potassium-reduced iron-graphite is similar to that of pure potassium-graphite. Removal of potassium-containing by-products from this material prior to use imparts behavior similar to that of an alumina-supported iron catalyst, but does not prevent the eventual, permanent loss of catalytic activity. The activity for Fischer-Tropsch conversion of a commercially-available metal aryl-reduced iron-graphite intercalate decreases with increasing reaction time, but eventually becomes stabilized at a level that is relatively independent of pretreatment conditions. The overall activity of this material is similar to that of a commercial iron/alumina catalyst, but its selectivity characteristics in the temperature range 225 to 325/sup 0/C are considerably different. The iron-graphite intercalate produces substantially smaller amounts of carbon dioxide and larger amounts of C/sub 2//sup +/ hydrocarbon products at one atmosphere pressure than does the iron/alumina catalyst under identical conditions.
- Research Organization:
- Texas A and M Univ., College Station (USA). Dept. of Chemistry
- OSTI ID:
- 5330306
- Report Number(s):
- FE-2467-4
- Country of Publication:
- United States
- Language:
- English
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Transition metal-graphite catalysts for production of light hydrocarbons from synthesis gas. Quarterly report, August 1, 1976--October 31, 1976. [C/sub 64/Na; C/sub 8/K; interaction of NaCl or KCl with graphite]
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10 SYNTHETIC FUELS
ALKALI METALS
CARBON
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMICAL REACTORS
CLATHRATES
COMPARATIVE EVALUATIONS
ELEMENTS
FISCHER-TROPSCH SYNTHESIS
FLUIDS
GASES
GRAPHITE
HYDROCARBONS
IRON
METALS
NONMETALS
ORGANIC COMPOUNDS
POTASSIUM
SODIUM
SYNTHESIS
SYNTHESIS GAS
TRANSITION ELEMENTS