CO Oxidation Catalyzed by Supported Gold: Cooperation between Gold and Nanocrystalline Rare-Earth Supports Forms Reactive Surface Superoxide and Peroxide Species

Authors

  • Javier Guzman Dr.,

    1. Instituto de Tecnología Química, UPV-CSIC, Universidad Politécnica de Valencia, Avda. de los Naranjos s/n, Valencia 46022, Spain, Fax: (+34) 96-387-7809
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  • Silvio Carrettin Dr.,

    1. Instituto de Tecnología Química, UPV-CSIC, Universidad Politécnica de Valencia, Avda. de los Naranjos s/n, Valencia 46022, Spain, Fax: (+34) 96-387-7809
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  • Juan C. Fierro-Gonzalez,

    1. Department of Chemical Engineering and Materials Science, University of California Davis, One Shields Ave. Davis, CA 95616, USA
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  • Yalin Hao,

    1. Department of Chemical Engineering and Materials Science, University of California Davis, One Shields Ave. Davis, CA 95616, USA
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  • Bruce C. Gates Prof. Dr.,

    1. Department of Chemical Engineering and Materials Science, University of California Davis, One Shields Ave. Davis, CA 95616, USA
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  • Avelino Corma Prof. Dr.

    1. Instituto de Tecnología Química, UPV-CSIC, Universidad Politécnica de Valencia, Avda. de los Naranjos s/n, Valencia 46022, Spain, Fax: (+34) 96-387-7809
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  • We thank CICYT (MAT 2003-07945-C02-01), the Auricat European Union network (HPRN-CT-2002-00174), the US National Science Foundation (CTS-0121619; JCF-G), and the US Department of Energy (FG02-04ER15513; YH) for financial support. We also thank the NSLS (supported by the US Department of Energy, DE-AC02-98CH10886) for beam time and the staff of the electron microscopy group at UPV.

Abstract

original image

Beneficial defects: Reactive η1-superoxide and peroxide species at one-electron defect sites are formed at the metal–support interface in gold nanoclusters on nanocrystalline CeO2−x. These intermediates oxidize CO adsorbed on gold to form CO2. The reactive oxygen species are formed on nanocrystalline CeO2−x (see picture) but not on conventional CeO2, and their formation is enhanced by the gold.

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