文献类型：期刊文献

英文题名：Au/TS-1 catalyst prepared by deposition-precipitation method for propene epoxidation with H2/O2: Insights into the effects of slurry aging time and Si/Ti molar ratio

作者：Feng, Xiang[1];Duan, Xuezhi[1];Cheng, Hongye[1];Qian, Gang[1];Chen, De[2];Yuan, Weikang[1];Zhou, Xinggui[1]

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

年份：2015

卷号：325

起止页码：128

外文期刊名：JOURNAL OF CATALYSIS

收录：;EI(收录号：20153801287611);WOS:【SCI-EXPANDED(收录号:WOS:000353750400014)】；

基金：This work is financially supported by the National Natural Science Foundation of China (91434117), 973 Program (2012CB720501) and the 111 Project of Ministry of Education of China (B08021).

语种：英文

外文关键词：Propene epoxidation; Aging time; Si/Ti molar ratio; Au location; Catalytic performance

摘要：Au/TS-1 catalyst prepared by deposition-precipitation method is efficient for propene epoxidation with H-2/O-2, and its performance is significantly affected by the preparation parameters and the properties of support. In this work, effects of the slurry aging time and Si/Ti ratio of support on the location of Au nanoparticles inside or outside the micropores of TS-1 supports are examined by multi-techniques such as in situ characterization and molecular dynamics simulation, and the as-obtained catalysts are tested for propene epoxidation. It is found that longer slurry aging time facilitates the evolution of Au complex into smaller sized species which is easier to locate inside the micropores. Accordingly, the as-reduced catalyst has more tiny Au nanoparticles that are extremely active inside micropores and shows higher initial PO formation rate (gpo h(-1) g(Au)(-1)). In addition, high Si/Ti ratio of TS-1 also favors the deposition of Au nanoparticles inside micropores, resulting in higher initial activity but lower stable activity. (C) 2015 Elsevier Inc. All rights reserved.