BiVO4微球负载RuAg纳米合金高效催化氨硼烷水解产氢  

BiVO4 microsphere supported RuAg nanoalloy as efficient catalytic dehydrogenation for the hydrolysis of ammonia borane

作　　者：陈三峡 刘梨 谢涛 张翊青 张淑娟 万正睿 周立群[1] CHEN Sanxia;LIU Li;XIE Tao;ZHANG Yiqing;ZHANG Shujuan;WAN Zhengrui;ZHOU Liqun(College of Chemistry and Chemical Engineering,Hubei University,Wuhan 430062,China)

机构地区：[1]湖北大学化学化工学院

出　　处：《湖北大学学报（自然科学版）》2019年第6期644-651,共8页Journal of Hubei University：Natural Science

基　　金：有机功能分子合成与应用教育部重点实验室项目(2016-KL-007)资助

摘　　要：采用一步水热法合成出BiVO4微球,首次以BiVO4微球为载体通过浸渍还原法,制备出Ru/Ag不同摩尔比的RuAg@BiVO4催化剂,并用于催化氨硼烷水解产氢.催化剂的结构、组成、形貌以及负载金属的电子状态分别运用XRD、TEM、SEM、EDS、XPS等手段进行表征,并探究催化剂在不同温度下的催化活性.结果发现,由于双金属Ru和Ag之间强的电子效应以及金属RuAg与载体BiVO4微球之间的双功能机制,使RuAg@BiVO4表现出高的催化活性,其中Ru0.6Ag0.8@BiVO4的催化性能最佳,该反应的活化能(Ea)和转化频率(TOF)分别为33.8kJ/mol和150.5molH2min^-1(molRu)^-1,这种制备简单、催化活性显著的催化剂为新型高效催化剂的研究提供了重要的参考价值.Microspherical BiVO4has been successfully synthesized by one step hydrothermal method, and bi-metallic RuAg nanoalloys are for the first time immobilized on the surface of BiVO4microspheres by an impregnation-reduction method to prepare RuAg@BiVO4catalysts with different Ru/Ag molar rations as catalytic dehydrogenation of ammonia borane (AB).The structure, composition, morphology and electronic state of the loading metal are characterized by XRD, TEM, SEM, EDS and XPS, and their catalytic properties have also been examined toward hydrolysis of ammonia borane at different temperatures.The results show that RuAg@BiVO4catalyst exhibits excellent catalytic activity, owing to the strong electronic effect caused between bimetallic Ru and Ag atoms, and the bi-functional effect generated between RuAg nanoalloys and the host of BiVO4microspheres, in which Ru 0.6 Ag 0.8 @BiVO4displays the highest catalytic activity, the activation energy (Ea) and the turn over frequency (TOF) are determined to be 33.8 kJ/mol and 150.5 mol H2min^-1 (mol Ru)^-1 , respectively.Therefore, easy preparation and remarkable catalytic performance provide important research value for the improvement of catalyst and industrial application.

关 键 词：钒酸铋 RuAg纳米合金 多相催化 氨硼烷 产氢 

分 类 号：O643.3[理学—物理化学]