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The Role of Oxides in Catalytic CO Oxidation over Rhodium and Palladium
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 122018 (English)In: ACS Catalysis, ISSN 2155-5435, E-ISSN 2155-5435, Vol. 8, no 5, p. 4438-4445Article in journal (Refereed) Published
Abstract [en]

Catalytic CO oxidation is a seemingly simple reaction between CO and O-2 molecules, one of the reactions in automotive catalytic converters, and the fruit-fly reaction in model catalysis. Surprisingly, the phase responsible for the catalytic activity is still under debate, despite decades of investigations. We have performed a simple but yet conclusive study of single crystal Rh and Pd model catalysts, resolving this controversy. For Rh, the oxygen-covered metallic surface is more active than the oxide, while for Pd, thin oxide films are at least as active as the metallic surface, but a thicker oxide is less active. Apart from resolving a long-standing debate, our results pinpoint important design principles for oxidation catalysts as to prevent catalytic extinction at high oxygen exposures.

Place, publisher, year, edition, pages
2018. Vol. 8, no 5, p. 4438-4445
Keywords [en]
CO oxidation, palladium, rhodium, oxide, surface oxide, oxidation catalysis, active phase
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-158166DOI: 10.1021/acscatal.8b00498ISI: 000431727300077OAI: oai:DiVA.org:su-158166DiVA, id: diva2:1234217
Available from: 2018-07-23 Created: 2018-07-23 Last updated: 2018-07-23Bibliographically approved

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