Selective Modification of the Acid–Base Properties of Ceria by Supported Au

Authors

  • Manuela C. I. Bezen,

    1. Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85748 Garching (Germany), Fax: (+49) 89-289-13544
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  • Dr. Cornelia Breitkopf,

    1. Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85748 Garching (Germany), Fax: (+49) 89-289-13544
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  • Nadia El Kolli,

    1. Laboratoire de Réactivité de Surface, UMR 7197 CNRS, Université Pierre et Marie Curie, UPMC, 4 place Jussieu, 75252 Paris cedex 05 (France)
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  • Jean-Marc Krafft,

    1. Laboratoire de Réactivité de Surface, UMR 7197 CNRS, Université Pierre et Marie Curie, UPMC, 4 place Jussieu, 75252 Paris cedex 05 (France)
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  • Dr. Catherine Louis,

    1. Laboratoire de Réactivité de Surface, UMR 7197 CNRS, Université Pierre et Marie Curie, UPMC, 4 place Jussieu, 75252 Paris cedex 05 (France)
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  • Prof. Dr. Johannes A. Lercher

    Corresponding author
    1. Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85748 Garching (Germany), Fax: (+49) 89-289-13544
    • Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85748 Garching (Germany), Fax: (+49) 89-289-13544
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Abstract

Au supported on CeO2 prepared by deposition–precipitation with urea leads to a basic catalyst. Au acts in two ways as surface modifier. First, Au selectively interacts with Ce4+ cations by either blocking access to or reducing Ce4+ to Ce3+. Second, the resulting Au atoms (presumably as Au+ ions) act as soft, weak Lewis acid sites stabilizing carbanion intermediates and enhancing hydride abstraction in the dehydrogenation of alcohols. In consequence, the thus-synthesized basic catalyst catalyzes the dehydrogenation of propan-2-ol to acetone with high efficiency and without notable deactivation. Additionally, the dehydration pathway of propan-2-ol is eliminated, as Au also quantitatively blocks access to strongly acidic Ce4+ ions or reduces them to Ce3+.

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