Abstract
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 (d 111 = 2.35 Å) on the surface of CeO2 (d 111 = 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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Original Russian Text © M.V. Grabchenko, G.V. Mamontov, V.I. Zaikovskii, O.V. Vodyankina, 2017, published in Kinetika i Kataliz, 2017, Vol. 58, No. 5, pp. 654–661.
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Grabchenko, M.V., Mamontov, G.V., Zaikovskii, V.I. et al. Effect of the metal−support interaction in Ag/CeO2 catalysts on their activity in ethanol oxidation. Kinet Catal 58, 642–648 (2017). https://doi.org/10.1134/S0023158417050056
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DOI: https://doi.org/10.1134/S0023158417050056