Selective Hydrogenation of Acetylene Over Gold Nanoparticles Supported on CeO2 Pretreated Under Different Atmospheres
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Supported gold catalysts are highly efficient for selective hydrogenation of acetylene. It has been shown that reducible materials such as ceria may influence the catalytic performance due to its unique charge shift between reduced and oxidized state. However, its role in catalytic performance remains fiercely debated. In this paper, differently morphological CeO2 supported Au catalysts were prepared with pretreatment under air and H2 atmospheres respectively, and evaluated for selective hydrogenation of acetylene. No matter with rod (abbreviated as R) or polyhedral (abbreviated as P) shape, the catalysts of Au/CeO2 reduced in air exhibits better catalytic performance than that in H2 atmosphere. The Au/CeO2 (R)-air catalyst shows the best performance. The C2H2 conversion is about three times of that over the catalyst of Au/CeO2 (R)-H2 at 300 °C. The Raman result and XPS analysis clearly showed a dependence of catalytic activity on the oxygen vacancy concentration of catalysts, revealing the correlation between its defect features and pretreatment atmosphere. Our report not only deepens the knowledge of catalytic performance affected by defect features of catalyst but also provides a possibility for the efficient heterogeneous gold/ceria catalysts by controlling the pretreatment atmosphere.
KeywordsAcetylene hydrogenation Au catalysts Oxygen deficiency Pretreatment atmosphere
This work was financially supported by the Key Research and Development Plan of Shandong Province (No. 2018CXGC1108) and the Natural Science Foundation of China (Nos. 21603181 and 21773202). We also acknowledge the financial support from the Collaborative Innovation Center of Light Hydrocarbon Transformation and Utilization.
- 13.Zhang C, Michaelides A, King DA, Jenkins SJ (2009) Oxygen vacancy clusters on ceria: decisive role of cerium electrons. Phys Rev B 79:7715–7722Google Scholar
- 18.Pei G, Liu X, Wang A, Lee AF, Isaacs MA, Li L (2015) Ag alloyed Pd single-atom catalysts for efficient selective hydrogenation of acetylene to ethylene in excess ethylene. ACS Catal 5:150505113815003Google Scholar