文献类型：期刊文献

英文题名：Enhanced Catalytic Performance for Propene Epoxidation with H2 and O2 over Bimetallic Au-Ag/Uncalcined Titanium Silicate-1 Catalysts

作者：Feng, Xiang[1,2];Yang, Jia[1];Duan, Xuezhi[1];Cao, Yuegiang[1];Chen, Bingxu[1];Chen, Wenyao[1];Lin, Dong[2];Qan, Gang[1];Chen, De[3];Yang, Chaohe[2];Zhou, Xinggui[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]China Univ Petr, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China;[3]Norwegian Univ Sci & Technol, Dept Chem Engn, N-7491 Trondheim, Norway

年份：2018

卷号：8

期号：9

起止页码：7799

外文期刊名：ACS CATALYSIS

收录：;EI(收录号：20182905572344);WOS:【SCI-EXPANDED(收录号:WOS:000444364800009)】；

基金：This work was supported by the National Science Foundation of China (Grant 21606254), the Key Research and Development Plan of Shandong Province (2017GSF17126), the Natural Science Foundation of Shandong Province (ZR2016BB16), the Independent Innovation Foundation of Qingdao (17-1-1-18-jch), and Fundamental Research Funds for the Central Universities (18CX02014A).

语种：英文

外文关键词：propene epoxidation; Au-Ag bimetallic catalysts; TS-1-B; DFT; synergy

摘要：Gradually emerging environmental concerns have triggered the development of highly efficient catalysts for propene epoxidation with H-2 and O-2. Unfortunately, intensifying the activity and stability is still a challenging task. Herein, Au-Ag bimetallic catalysts were deposited on titanium silicate-1 with blocked pores (TS-1-B). Via density functional theory calculations together with multiple types of characterization (e.g., high-angle annular dark-field scanning transmission electron microscopy, ultraviolet-visible, and X-ray photoelectron spectrometry), we found that the synergy between Au and Ag significantly improved the catalytic performance via not only the decrease in the Au nanoparticle size but also the enhanced oxygen adsorption and electron transfer ability from Au to O-2. Furthermore, a volcano-shaped relationship between the Au/Ag ratio and catalytic performance was also established, and the Au-10-Ag-1/TS-1-B catalyst showed an excellent stable PO formation rate (174-233 g(PO) h(-1) g(Au)(-1)) and a H-2 efficiency of 44%, higher than those of the reported stable catalysts. The insights and methodology reported here may pave the way for maximizing Au utilization efficiency and unraveling the intrinsic structure-performance relationship of bimetallic catalysts for propene epoxidation.