文献类型：期刊文献

英文题名：Pd-SnO2/Al2O3 heteroaggregate nanocatalysts for selective hydrogenations of p-nitroacetophenone and p-nitrobenzaldehyde

作者：Liu, Miaomiao[1,2,3];Tang, Weiqiang[1,2];Xu, Yisheng[1,2];Yu, Hongbo[1,2];Yin, Hongfeng[3];Zhao, Shuangliang[1,2];Zhou, Shenghu[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, 1219 Zhongguan West Rd, Ningbo 315201, Zhejiang, Peoples R China

年份：2018

卷号：549

起止页码：273

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：;EI(收录号：20174304304854);WOS:【SCI-EXPANDED(收录号:WOS:000417008800030)】；

基金：S. Zhou and H. Yin thank programs of Ningbo Municipal Science and Technology Innovative Research Team (Grant No. 2014B81004 and 2016B10005). This work is also supported by the National Natural Science Foundation of China (Grant No. 21776090, 21571183 and 91434110).

语种：英文

外文关键词：Pd-SnO2; Bimetallic nanocatalysts; Selective hydrogenation

摘要：Pd-SnO2 heteroaggregate nanocatalysts were synthesized by in-situ transformation of PdSn bimetallic nano particles on alumina. The PdSn bimetallic nanoparticles were prepared by co-reduction of Pd and Sn precursors. The obtained PdSn nanoparticles possibly have a core-shell like structure with Pd cores and Sn-rich shells due to the fast reduction of Pd precursors. The Pd-SnO2/Al2O3 heteroaggreagte nanocatalysts were synthesized by calcination of PdSn/Al2O3 in air followed by H-2 reduction. Various characterization techniques, such as HRTEM, XRD and XPS, were used to characterize the PdSn and Pd-SnO2. The Pd-3-(SnO2)(1)/Al2O3 heteroaggreagte nanocatalysts with a ratio of Pd/Sn of 3/1 illustrated enhanced catalytic performances forp-nitroacetophenone and p-nitrobenzaldehyde hydrogenations relative to monometallic Pd nanocatalysts. Theoretical calculations using density functional theory suggested that Pd-SnO2 facilitates the adsorption of reactants in a higher degree than that of products, thus enhancing the catalytic activity even with partial coverage of Pd surfaces with SnO2. The blockage effect of SnO2 on Pd surfaces is speculated to enhance the catalytic selectivity for p-nitroacetophenone and p-nitrobenzaldehyde hydrogenations over Pd-SnO2 heteroaggregate nanocatalysts.