4 years ago

Heterogeneity in Mixed Cerium Oxides and Its Influence on the Behavior of Gold Catalysts for the Selective Oxidation of Ethanol

Heterogeneity in Mixed Cerium Oxides and Its Influence on the Behavior of Gold Catalysts for the Selective Oxidation of Ethanol
Gregory M. Mullen, Iliya Sabzevari, Benjamin C. Siegert, Benjamin K. Rosselet, Nathaniel R. Miller, C. Buddie Mullins, Andrei Dolocan
Mixed metal oxides have been investigated for a host of applications, yet many questions regarding the relationship between their material properties and their functional behavior remain unanswered. Mixed metal oxides are frequently used as support materials for catalytic processes, and the structure/composition of the oxide can significantly influence the behavior of a mixed oxide supported catalyst. In this article, we study the material properties of binary mixed cerium oxide supports synthesized with various metal additives and their corresponding influences on the behavior of gold catalysts for selective oxidation of ethanol. We have found that, although all of these materials exhibited X-ray diffraction patterns consistent with a pure cerium oxide phase, compositional heterogeneities were present in many of the samples, as indicated by time-of-flight secondary ion mass spectrometry and temperature-programmed-reduction techniques. Furthermore, the mixed cerium oxide supported gold catalysts demonstrated differences in both activity and selectivity for ethanol oxidation, with the materials that exhibited heterogeneous phases promoting the esterification reaction with higher selectivities than the homogeneous mixtures. Our results show that the composition of mixed metal oxide supports can have an important impact on catalytic behavior, providing a means of influencing activity and tuning selectivity.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b06029

DOI: 10.1021/acs.jpcc.7b06029

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