Construction of mesoporous ceria-supported gold catalysts with rich oxygen vacancies for efficient CO oxidation  

作　　者：Xin Shen Wang Li Shunmin Ding Xiaohua Ma Shaohua Wu Weiming Xiao Rong Zeng Sanguo Hong Chao Chen 

机构地区：[1]Key Laboratory of Jiangxi Province for Environment and Energy Catalysis,College of Chemistry,Nanchang University,Nanchang 330031,China [2]Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices,School of Chemistry,Biology and Materials Science,East China University of Technology,Nanchang 330013,China

出　　处：《Journal of Rare Earths》2022年第3期434-442,I0003,共10页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(22002056,21663016,21961021);the Key Laboratory of Jiangxi Province for Environment and Energy Catalysis(20181BCD40004);the Research Project on Teaching Reform of Degree and Graduate Education of Jiangxi Province(JXYJG-2018-007)。

摘　　要：Bearing unique redox nature and high oxygen storage capacity,ceria(CeO_(2))has always been a promising CO oxidation catalyst support for gold(Au)catalysts and the like.Herein,a series of Au-CeO_(2)-P(P stands for pH value)samples was prepared by a co-precipitation method with the assistance of an alkaline environment and amino groups functionalized ordered mesoporous polymer(OMP-NH_(2)).Afterward,all samples described above were characterized that the Au-CeO_(2)-P catalysts are made of Au-Ce-O solid solution and Au nanoparticles(NPs)supported on CeO_(2).It turns out that OMP-NH_(2) is not just a simple sacrificial template for mesoporous structure,but also plays an important role as an amino source,explaining the presence of rich oxygen vacancies.Due to the concentration of oxygen vacancies in Au-Ce-O solid solution is the key factor for the oxygen mobility of CO oxidation,the catalytic results also demonstrate that the catalytic activity of Au-CeO_(2)-P catalysts is related to the concentration of their oxygen vacancies.Moreover,Au-CeO_(2)-9.6 with a highest concentration of oxygen vacancies(as high as 13.98%)in Au-CeO_(2)-P catalysts exhibits the best catalytic activity(complete conversion at 10℃).

关 键 词：CERIA Oxygen vacancies Au-Ce-O solid Solution Amino groups functionalized ordered mesoporous polymer CO oxidation Rare earths 

分 类 号：O643.36[理学—物理化学]