文献类型：期刊文献

英文题名：Selective Hydrogenation of Acetylene over Pd-In/Al2O3 Catalyst: Promotional Effect of Indium and Composition-Dependent Performance

作者：Cao, Yueqiang[1];Sui, Zhijun[1];Zhu, Yian[1];Zhou, Xinggui[1];Chen, De[2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Norwegian Univ Sci & Technol, Dept Chem Engn, N-7491 Trondheim, Norway

年份：2017

卷号：7

期号：11

起止页码：7835

外文期刊名：ACS CATALYSIS

收录：;EI(收录号：20174504379717);WOS:【SCI-EXPANDED(收录号:WOS:000414724700055)】；

基金：This work was financially supported by the National Basic Research Program of China (973 Project, 2012CB720500) and National Natural Science Foundation of China (NSFC, 21376076, 91645122).

语种：英文

外文关键词：acetylene hydrogenation; Pd/Al2O3; hydride; indium; green oil

摘要：Highly dispersed bimetallic Pd-In catalysts on Al2O3 were prepared by a simple impregnation method. In comparison with the unsupported intermetallic catalyst, the supported Pd-In catalyst exhibited several magnitudes higher activity and similar selectivity for selective acetylene hydrogenation. Moreover, the activity, selectivity, and anticoking performance of the Pd-In catalyst were superior to those of the monometallic Pd catalyst. The electron transferred from indium weakened the adsorption of ethylene on the negatively charged Pd sites and hence improved the selectivity of Pd-In/Al2O3. The inhibited formation of hydride due to the presence of indium also contributed to the higher selectivity. The promoted activation of hydrogen, owing to the weak adsorption of acetylene on Pd-In/Al2O3, and decreased particle size jointly contributed to the enhanced activity of Pd-In/Al2O3. In addition, green oil formation on Pd-In/Al2O3 was retarded by the presence of indium, contributing to the enhanced stability of the catalyst. The bimetallic Pd-In catalysts showed a strongly composition dependent performance, which resulted from the different extent of electronic and/or geometric modification of Pd active sites.