On the mechanism of hydrogen-promoted gold-catalyzed CO oxidation

Elodie Quinet, Laurent Piccolo, Franck Morfin, Priscilla Avenier, Fabrice Diehl, Valerie Caps, Jean Luc Rousset

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

The kinetics of CO oxidation, H2 oxidation and preferential CO oxidation (PrOx) over Au/Al2O3 catalysts have been investigated. The catalysts with the smallest particles (∼2 nm) are the most active for all three reactions. As previously observed, the presence of H2 greatly promotes CO oxidation, which becomes faster than CO-free H2 oxidation at low temperature. From these results and on the basis of previous works, we propose a complete PrOx mechanism. The reaction involves Au-OOH, Au-OH and Au-H intermediates, also involved in H2 oxidation, and benefits from the presence of low-coordination sites. © 2009 Elsevier Inc. All rights reserved.
Original languageEnglish (US)
Pages (from-to)384-389
Number of pages6
JournalJournal of Catalysis
Volume268
Issue number2
DOIs
StatePublished - Dec 10 2009

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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