Selective Modification of the Acid-Base Properties of Ceria by Supported Au - Sorbonne Université Access content directly
Journal Articles Chemistry - A European Journal Year : 2011

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

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+.

Domains

Catalysis

Dates and versions

hal-00666903 , version 1 (06-02-2012)

Identifiers

Cite

Manuela C.I. Bezen, Cornelia Breitkopf, Nadia El Kolli, Jean-Marc Krafft, Catherine Louis, et al.. Selective Modification of the Acid-Base Properties of Ceria by Supported Au. Chemistry - A European Journal, 2011, 17 (25), pp.7095-7104. ⟨10.1002/chem.201002011⟩. ⟨hal-00666903⟩
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