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

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• 作者：Elodie Quinet ; Laurent Piccolo ; Franck Morfin ; Priscilla Avenier ; Fabrice Diehl ; Valé ; rie Caps ; Jean-Luc Rousset
• 关键词：CO oxidation ; PrOx or SelOx ; Hydrogen ; Gold ; Hydroperoxy intermediates
• 刊名：Journal of Catalysis
• 出版年：2009
• 出版时间：10 December 2009
• 年：2009
• 卷：268
• 期：2
• 页码：384-389
• 全文大小：366 K

文摘

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.