Palladium materials are well-known commercial catalysts for selective hydrogenation of acetylene in ethylene, but with relatively low selectivity. Recently, ceria has been demonstrated to show high selectivity and considerable activity for selective hydrogenation at high temperatures. The objective of this investigation is to develop ceria-based Pd catalysts with high activity and high selectivity for the selective hydrogenation of acetylene in ethylene at lower temperatures by using the co-precipitation technique, or the combustion technique followed by post-treatment procedures, such as calcination, plasma treatments, etc. Pd-ceria catalysts with Pd loadings of 0.1-0.2% have been synthesized and studied for reactions at temperatures from 50°C to 200°C, with various reduction conditions. According to the reaction results, the reduced samples showed relatively higher conversion throughout the reaction temperatures. However, the selectivity of these catalysts was quite low. The results indicate that a significant amount of Pd appeared on the catalyst surface which promoted over-hydrogenation of ethylene to ethane, resulting in low ethylene selectivity. Based on the temperature programmed reduction results, the reduction of Pd species at low temperatures depends on the Pd loading and the calcination temperature. The relationship among the performance of catalysts, the post-treatment procedures, and reduction conditions will be discussed.<br/>

Investigation of PdCeO<sub>x</sub> solid solution catalysts for selective hydrogenation of acetylene

2019 Spring National Meeting

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Investigation of PdCeOx solid solution catalysts for selective hydrogenation of acetylene

Investigation of PdCeO_x solid solution catalysts for selective hydrogenation of acetylene