Gold/Mg-Al mixed oxides catalysts for oxidative esterification of methacrolein:Effects of support size and composition on gold loading  被引量:1

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作  者:Wangtao Li Qiancheng Zheng Huayu Zhang Yunsheng Dai Zhengbao Wang 

机构地区:[1]Key Laboratory of Biomass Chemical Engineering of Ministry of Education,ERC of Membrane and Water Treatment(MOE),Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China [2]Yunnan Precious Metals Laboratory Co.,Ltd,Kunming 650106,China

出  处:《Chinese Journal of Chemical Engineering》2023年第12期128-138,共11页中国化学工程学报(英文版)

基  金:Open Project of Yunnan Precious Metals Laboratory Co.,Ltd(YPML-2023050269);the Fundamental Research Funds for the Central Universities(226-2023-00085,226-2023-00057).

摘  要:Gold catalysts supported on Mg-Al mixed oxides for oxidative esterification of methacrolein are prepared by impregnation.Effects of the support particle size,concentration of HAuCl4 solution and Mg/Al ratio on gold loading and catalytic properties are investigated.The catalysts are characterized by CO_(2)-TPD,EDS,XPS,STEM and XRD techniques.Catalysts with smaller support particle size show more uniform gold distribution and higher gold dispersion,resulting in a higher catalytic performance,and the uniformity of gold and the activity of the catalysts with larger support particle size can be improved by decreasing the concentration of HAuCl4 solution.The Mg/Al molar ratio has significant effect on the uniformity of gold and the activity of the catalyst,and the optimum Mg/Al molar ratio is 0.1–0.2.This study underlines the importance of engineering support particle size,concentration of HAuCl4 solution and density of adsorption sites for efficient gold loading on support by impregnation.

关 键 词:Gold catalysts Oxidative esterification Support particle size effect Mass transfer DISTRIBUTIONS Optimization 

分 类 号:TQ426[化学工程]

 

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