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Hydrogenation of carbon monoxide over alkali metal-graphite intercalates. Reaction selectivity and catalyst deactivation characteristics

Journal Article · · J. Catal.; (United States)
;
Alkali metal-graphite intercalates, NaC/sub 64/ and KC/sub 8/, and an iron-containing potassium-graphite (4.5 wt % Fe) possess large adsorption capacities for carbon monoxide and exhibit high initial activities for CO hydrogenation at 300/sup 0/C and 1 atm pressure. Primary hydrocarbon products obtained over sodium-graphite include both paraffins and olefins, while the product distributions over both potassium-based intercalates are limited to saturated hydrocarbons, primarily C/sub 1/--C/sub 3/, due to the olefin hydrogenation capabilities of these materials. Carbon dioxide generation by a shift reaction is prevented in all cases by the immediate and continuous removal of by-product water via interaction with intercalated alkali metal species. The latter process causes a complete and irreversible loss of catalytic activity after a cumulative conversion that, for KC/sub 8/, is equivalent to one CO molecule per three interlamellar potassium atoms/ions, suggesting a lack of interlayer penetration by CO rectant. In the case of iron-containing potassium-graphite, no residual hydrogenation activity ascribable to the transition metal component remained following total destruction of intercalated potassium. Adsorption and subsequent reaction of carbon monoxide over all of these materials apparently occurs on sites associated with intercalated alkali metal species located primarily along the exposed edges of graphitic planes. 6 figures, 1 table.
Research Organization:
Texas A and M Univ., College Station
OSTI ID:
6299548
Journal Information:
J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 56:2; ISSN JCTLA
Country of Publication:
United States
Language:
English

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Hydrogenation of carbon monoxide over alkali metal/graphite intercalates. Reaction selectivity and catalyst deactivation characteristics. [Alkali metal/graphite intercalates]
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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)]
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Related Subjects

090121 -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METALS
ALKANES
ALKENES
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CLATHRATES
COMPARATIVE EVALUATIONS
CRYOGENIC FLUIDS
DATA
DATA FORMS
DEACTIVATION
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
GRAPHITE
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
INFORMATION
IRON
ISOLATED VALUES
KINETICS
LOW PRESSURE
MECHANICAL STRUCTURES
METALS
METHANATION
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM
PRESSURE DEPENDENCE
REACTION KINETICS
SODIUM
SPECIFICITY
SUPPORTS
SYNTHESIS GAS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
YIELDS