文献类型：期刊文献

英文题名：Manipulation of the PdAu-PdAuOx interface on Pd-Au bimetallic catalysts for the direct synthesis of hydrogen peroxide

作者：Zhang, Jixuan[1];Tian, Pengfei[2];Xu, Aihao[3];Ouyang, Like[4];Yang, Zixu[1];Xu, Jing[1,3]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[3]Guangxi Univ, Guangxi Key Lab Petrochem Resource Proc & Proc Int, Sch Chem & Chem Engn, Nanning 530004, Peoples R China;[4]Sichuan Univ, Coll Chem Engn, Chengdu 610065, Peoples R China

年份：2023

卷号：34

期号：11

外文期刊名：CHINESE CHEMICAL LETTERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001058265700001)】；

基金：This work was supported by the National Natural Science Foundation of China (Nos. 91934302 and 22178110), the Dean/Opening Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology (No. 2020K001) and the Project of the Department of Science and Technology of Sichuan Province (No. 2023YFQ0086).

语种：英文

外文关键词：H2O2 synthesis; Bimetallic catalysts; Palladium particle size; Pd-0/Pd2+ ratio; Structure-performance relationship

摘要：Direct synthesis of H2O2 from H-2 and O-2 via heterogeneous catalysis is an environmentally friendly and atomically economic alternative to the traditional anthraquinone oxidation (AO) process. Optimizing the electronic and geometric structures of the active metals to break the current limitations of hydrogenation rate and H2O2 selectivity is a promising and challenging topic. In this study, a series of Pd-Au bimetallic catalysts supported on TiO2 with a metal loading of 3.0 wt% and a constant Pd/Au molar ratio (Pd:Au = 2:1) were prepared. The catalysts were reduced in H-2 at different temperatures (473, 573 and 673 K), and their catalytic activity for the direct H2O2 synthesis were evaluated at 283 K and 0.1 MPa. H-2 reduced Pd-Au catalysts exhibited superior performance in direct H2O2 synthesis. The maximum H2O2 selectivity of 87.7% and H2O2 yield of 3116.4 mmol h(-1) g Pd-1 were achieved over the Pd 2.0 Au 1.0-573 catalyst with a H-2 conversion of 12.8%. The tailored local chemical environment caused by H-2 reduction creates a balanced ratio of Pd-0 and PdOx sites, thus improving the selectivity towards H2O2. This work developed an effective strategy for fabrication of highly active and stable Pd-based H2O2 synthesis catalysts with high H2O2 yield. (C) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.