Kinetics of CO oxidation on Cu/Rh(100) model bimetallic catalysts
- Texas A M Univ., College Station, TX (United States)
The oxidation of carbon monoxide has been studied on a series of Cu/Rh(100) model bimetallic catalysts using a combined elevated pressure reactor-ultrahigh vacuum surface analysis system. The effects of temperature and oxygen/carbon monoxide partial pressures on the rates of CO[sub 2] formation and surface composition/morphology were determined. Although the addition of copper to Rh(100) altered the rate of CO oxidation, the kinetic behavior of the Cu/Rh(100) catalysts was essentially the same as that for Rh(100) with modifications within the low Cu coverage region, i.e., at [theta][sub Cu] < 0.5 ML. The altered kinetics are attributed to two types of reaction sites at these low Cu coverages. The primary role of copper in the Cu/Rh(100) bimetallic catalyst is to increase the surface oxygen coverage. The presence of Cu and Rh carbonate-like surface species was evident in postreaction TPD analysis. 31 refs., 6 figs.
- OSTI ID:
- 7045986
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 145:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALLOYS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COPPER ALLOYS
DESORPTION
KINETICS
MILLER INDICES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM METAL ALLOYS
REACTION KINETICS
RHODIUM ALLOYS
SORPTION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K