文献类型：期刊文献

英文题名：Au nanoparticles deposited on the external surfaces of TS-1: Enhanced stability and activity for direct propylene epoxidation with H2 and O2

作者：Feng, Xiang[1];Duan, Xuezhi[1];Qian, Gang[1];Zhou, Xinggui[1];Chen, De[2];Yuan, Weikang[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：2014

卷号：150

起止页码：396

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY

收录：;EI(收录号：20140417222918);WOS:【SCI-EXPANDED(收录号:WOS:000332803700043)】；

基金：This work is financially supported by the 973 Program (2012CB720501), the Natural Science Foundation of China (U1162112), the China Postdoctoral Science Foundation (2012M520041 and 2013T60428), and the 111 Project of Ministry of Education of China (B08021).

语种：英文

外文关键词：Propylene epoxidation; Au/TS-1 catalyst; Deactivation mechanism; Micropore blocking; Stability

摘要：Au/TS-1 catalysts prepared by deposition-precipitation method are very promising for direct propylene epoxidation with H-2 and O-2. However, the catalysts usually suffer from rapid deactivation. In this work, calcined TS-1 with open micropores (TS-1-O) is first used to support Au catalysts, and then the used catalysts at different time-on-streams are characterized to understand the deactivation mechanism. The micropore blocking by carbonaceous deposits is found to be responsible for the deactivation. We therefore suggest a principle of catalyst design to improve the long term stability by depositing Au nanoparticles on the external surfaces of TS-1. For this purpose, uncalcined TS-1 with blocked micropores (TS-1-B) is used to support Au catalyst. As expected, the designed catalyst is not only very stable because of the elimination of pore blocking and the more accessible active sites, but also highly active with the PO formation rate of 125 g(PO) h(-1) kg(Cat)(-1) for over 30 h. (C) 2013 Elsevier B.V. All rights reserved.