文献类型：期刊文献

英文题名：Uncalcined TS-2 immobilized Au nanoparticles as a bifunctional catalyst to boost direct propylene epoxidation with H2 and O2

作者：Zhang, Zhihua[1];Zhao, Xuan[1];Wang, Gang[1];Xu, Jialun[1];Lu, Mengke[1];Tang, Yanqiang[1];Fu, Wenzhao[1];Duan, Xuezhi[1];Qian, Gang[1];Chen, De[2];Zhou, Xinggui[1]

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

年份：2020

卷号：66

期号：2

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20194507648863);WOS:【SCI-EXPANDED(收录号:WOS:000494243600001)】；

基金：111 Project of the Ministry of Education of China, Grant/Award Number: B08021; Open Project of SKLOCE, Grant/Award Number: SKL-Che-15C03; Shanghai Rising-Star Program, Grant/Award Number: 17QA1401200; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning; Shanghai Natural Science Foundation, Grant/Award Numbers: 17ZR1407500, 17ZR1407300; Natural Science Foundation of China, Grant/Award Numbers: 21776077, 21922803

语种：英文

外文关键词：Au; TS-2; bifunctional catalyst; high stability; hydrogen efficiency; propylene epoxidation

摘要：Developing stable yet efficient Au-Ti bifunctional catalysts is important but challenging for direct propylene epoxidation with H-2 and O-2. This work describes a novel strategy of employing uncalcined titanium silicalite-2 (TS-2-B) to immobilize Au nanoparticles as a bifunctional catalyst for the reaction. Under no promoter effects, the Au/TS-2-B catalyst compared to the referenced Au/TS-1-B catalyst delivers outstanding catalytic performance, that is, exceptionally high stability over 100 hr, propylene oxide (PO) formation rate of 118 g(PO)center dot hr(-1)center dot kg(cat)(-1), PO selectivity of 90% and hydrogen efficiency of 35%. The plausible relationship of catalyst structure and performance is established by using multiple techniques, such as UV-vis, high-angle annular dark-field scanning transmission electron microscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. A unique synergy of Au-Ti4+-Ti3+ triple sites is proposed for our developed Au/TS-2-B catalyst with the higher stable PO formation rate and hydrogen efficiency. The insights reported here could shed new light on the rational design of highly stable and efficient Au-Ti bifunctional catalysts for the reaction.