Selective modification of the acid-base properties of ceria by supported Au |
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Authors: | C I Bezen Manuela Breitkopf Cornelia El Kolli Nadia Krafft Jean-Marc Louis Catherine Lercher Johannes A |
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Institution: | 1. Department Chemie, Technische Universit?t München, Lichtenbergstr. 4, 85748 Garching (Germany), Fax: (+49)?89‐289‐13544;2. 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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Abstract: | Au supported on CeO(2) prepared by deposition-precipitation with urea leads to a basic catalyst. Au acts in two ways as surface modifier. First, Au selectively interacts with Ce(4+) cations by either blocking access to or reducing Ce(4+) to Ce(3+). 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 Ce(4+) ions or reduces them to Ce(3+). |
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Keywords: | cerium gold heterogeneous catalysis IR spectroscopy supported catalysts |
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