Spectroscopic Identification of the Active Site for CO Oxidation on Rh/Al2O3 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 g...

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Bibliographic Details
Published in:Journal of catalysis 1999-12, Vol.188 (2), p.426-430
Main Authors: Cavers, M., Davidson, J.M., Harkness, I.R., Rees, L.V.C., McDougall, G.S.
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Chemistry
CO oxidation
DRIFTS
Exact sciences and technology
forced oscillations
General and physical chemistry
rhodium
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary: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 (υCO=2100 cm−1) on a catalyst surface apparently otherwise dominated by CO adsorbed as unreactive geminal dicarbonyl.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1999.2672