Hydrogenation of carbon monoxide over silica-supported nickel-copper and ruthenium-copper catalysts
Hydrogen adsorption on supported 0.05:1 to 1:1 copper-nickel (which forms alloys in the bulk) and copper-ruthenium (which is immiscible in the bulk) decreased linearly with increasing copper content. The derived particle sizes were in the 35-65 A. range. The reaction of carbon monoxide with hydrogen at 250/sup 0/-325/sup 0/C on these catalysts proceeded with an activation energy of 30-31 kcal/mole on both catalyst systems, at all metal ratios, and at all gas compositions tested. With increasing copper content, the activity decreased, the selectivity to methane increased, and the selectivity to higher hydrocarbons decreased, which indicated that the number of active sites in the ensemble for higher hydrocarbon formation is larger than for methane formation, i.e., the effect of dilution of the active metal with copper is only a geometric one. A ''gas-induced surface enrichment'' was observed in the 0.5:1 and 1:1 copper-ruthenium catalysts, whose activity increased by more than a factor of two before reaching steady state.
- Research Organization:
- Univ. Technol. Eindhoven
- OSTI ID:
- 5334652
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 82:18; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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400201 -- Chemical & Physicochemical Properties
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ACTIVATION ENERGY
ADSORPTION
ALKANES
ALLOYS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COPPER
COPPER ALLOYS
ELEMENTS
ENERGY
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
METALS
METHANATION
METHANE
NICKEL
NICKEL ALLOYS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
RUTHENIUM
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THERMODYNAMICS
TRANSITION ELEMENTS
YIELDS