文献类型：期刊文献

英文题名：Phosphate-Modified Effects on Uncalcined TS-1-Immobilized Au Catalysts for Propylene Epoxidation with H2 and O2

作者：Xu, Jialun[1];Zhang, Zhihua[1];Yu, Daiyi[1];Du, Wei[1];Zheng, Yang[1];Song, Nan[1];Duan, Xuezhi[1];Zhou, Xinggui[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：62

期号：50

起止页码：21654

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20235115246396);WOS:【SCI-EXPANDED(收录号:WOS:001129152900001)】；

基金：The authors acknowledge the financial support from the Research Fund for National Key Research and Development Program of China (no. 2021YFA1501403), the National Natural Science Foundation of China (nos. 21922803 and 22038003), Shanghai Rising-Star Program (no. 17QA1401200), and the Innovation Program of the Shanghai Municipal Education Commission (no. 17ZR1407300).

语种：英文

外文关键词：Binary alloys - Catalyst activity - Catalyst selectivity - Efficiency - Propylene - Surface defects - Zeolites

摘要：Au nanoparticle sizes, as well as surface properties and Ti species of titanosilicate zeolite, have been identified to significantly influence the performances of Au-Ti bifunctional catalysts over propylene epoxidation with H-2 and O-2 to propylene oxide (HOPO process). Herein, we perform a convenient and efficient strategy to simultaneously regulate the properties of Au and Ti active sites by impregnating phosphate onto the uncalcined TS-1 zeolite (i.e., TS-1-B). The optimal P-modified TS-1-B-immobilized Au catalyst shows notably increased activity by 75% compared to the pristine Au/TS-1-B catalyst with a near PO selectivity and H-2 efficiency. We found that the introduction of phosphate conduces to the Au capture and formation of the smaller-sized Au nanoparticles with the smaller size over the TS-1-B zeolite, which promotes the generation of hydroperoxide species thereon and thus boosts the PO activity. Moreover, the moderate P modification could form highly active Ti species, reduce the surface defect, and enhance the Lewis acid sites over the TS-1-B zeolite, which makes for maintaining acceptable PO selectivity and H-2 efficiency under a high PO formation rate. We suggested this work could help develop efficient modification methods over Au-Ti bifunctional catalysts for this reaction.