Journal
JOURNAL OF CATALYSIS
Volume 302, Issue -, Pages 20-30Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2013.02.021
Keywords
Reverse Water-Gas Shift (RWGS) reaction; Oxygen storage capacity (OSC); CO oxidation; CO2 reduction; Au/CeO2 catalyst; Temporal analysis of products (TAP)
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Funding
- Baden-Wurttemberg Stiftung within the Network Functional Nanostructures
- Alexander von Humboldt-Foundation
- University of Toronto within the summer research program
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As a first step toward elucidating the mechanism of the Reverse Water-Gas Shift (RWGS) reaction on a supported Au/CeO2 catalyst, in particular the role of the redox mechanism, we have investigated the ability and activity of CO2 for re-oxidizing a pre-reduced Au/CeO2 catalyst surface by quantitative temporal analysis of products (TAP) measurements. It is demonstrated that a surface-reduced Au/CeO2 catalyst can be (partially) re-oxidized by exposure to CO2 pulses and that the surface oxygen deposited this way can be reactively removed again. The probability for oxygen deposition from CO2, however, is significantly lower than that from O-2. Both the low reaction probability and the temperature dependence of oxygen deposition from CO2 point to an activated step. Implications of these results for the mechanism of the RWGS reaction are discussed. (c) 2013 Elsevier Inc. All rights reserved.
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