Spectroscopic identification of the active site for CO oxidation on Rh/Al{sub 2}O{sub 3} by concentration modulation in situ DRIFTS
Diffuse reflectance infrared spectroscopy experiments are described in which the concentrations of the reactant gases passing over a solid catalyst are modulated. This simple modification to the normal in situ experiment enables direct correlation of specific surface species with the production of gaseous products. Spectra of solely the active surface intermediates with no contribution from so called spectator species are generated. For CO oxidation over a Rh/alumina catalyst at 576 K, the active CO species is identified as linearly adsorbed CO on oxidized Rh sites ({nu}{sub CO} = 2,100 cm{sup {minus}1}) on a catalyst surface apparently otherwise dominated by CO adsorbed as unreactive geminal dicarbonyl.
- Research Organization:
- Univ. of Edinburgh (GB)
- OSTI ID:
- 20005908
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 188; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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