Catalytic oxidation of carbon monoxide over RuRh/SiO/sub 2/ bimetallic clusters

Journal Article · Thu Feb 13 04:00:00 EST 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100276a029· OSTI ID:6038414

McClory, M M; Gonzalez, R D

The oxidation of CO over a series of well-characterized Ru-Rh/SiO/sub 2/ catalysts has been studied both in a Pyrex microreactor and by using an in situ infrared cell-reactor. The incorporation of Rh into a supported Ru catalyst results in the formation of bimetallic clusters which have mixed metal surface sites. The incorporation of Rh into a supported Ru catalysts results in the formation of bimetallic clusters which have mixed metal surface sites. These bimetallic clusters are much more resistant to deactivation by oxygen than Ru/SiO/sub 2/. The ratio of CO/O/sub 2/ partial pressures required for a change over from a diffusion-controlled regime to a kinetically controlled regime increases from 1.0 on Rh/SiO/sub 2/ to 2.0 on Ru/SiO/sub 2/ at 100 /sup 0/C. This observation correlates well with an increase in the strength of the metal-oxygen bond for Ru as compared to Rh. In situ infrared spectra of adsorbed CO during reaction conditions show that the changeover between the diffusion-controlled and kinetically controlled regimes is concomitant with the displacement of an O/sub 2/ adlayer by CO. Turnover frequencies for the rate of CO/sub 2/ formation as a function of surface composition over the series of bimetallic clusters studied showed little or no synergism. 27 references, 7 figures, 3 tables.

• Research Organization: Univ. of Rhode Island, Kingston
• OSTI ID: 6038414
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:4; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMICAL REACTORS
DATA
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
INFRARED SPECTRA
KINETICS
METALS
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PLATINUM METALS
PRESSURE DEPENDENCE
REACTION KINETICS
RHODIUM
RUTHENIUM
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENTS