Effect of the metal−support interaction in Ag/CeO2 catalysts on their activity in ethanol oxidation


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The interaction of silver with the surface of CeO2 in the Ag/CeO2 catalysts prepared by coprecipitation and impregnation techniques was studied by temperature-programmed reduction, X-ray diffraction, and high-resolution transmission electron microscopy. It was shown that coprecipitation technique led to formation of strong silver–support interaction and the epitaxy of silver particles (d111 = 2.35 Å) on the surface of CeO2 (d111 = 3.1 Å). This provided incresed catalytic activity in the oxidative dehydrogenation of ethanol at relatively low temperatures (a 15% conversion of ethanol with 100% selectivity for the formation of acetaldehyde was reached at 85°C). Above 130°C, the deep oxidation of ethanol to CO2 becomes the predominant direction of a catalytic reaction, and the Ag/CеО2 catalyst obtained by impregnation technique was most active in this region as a consequence of the weaker metal–support interaction.

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M. Grabchenko

National Research Tomsk State University

编辑信件的主要联系方式.
Email: marygra@mail.ru
俄罗斯联邦, Tomsk, 634050

G. Mamontov

National Research Tomsk State University

Email: marygra@mail.ru
俄罗斯联邦, Tomsk, 634050

V. Zaikovskii

Boreskov Institute of Catalysis, Siberian Branch

Email: marygra@mail.ru
俄罗斯联邦, Novosibirsk, 630090

O. Vodyankina

National Research Tomsk State University

Email: marygra@mail.ru
俄罗斯联邦, Tomsk, 634050

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