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

被引:0
|
作者
Shen, Xin [1 ]
Li, Wang [1 ]
Ding, Shunmin [1 ]
Ma, Xiaohua [1 ]
Wu, Shaohua [1 ]
Xiao, Weiming [1 ]
Zeng, Rong [2 ]
Hong, Sanguo [1 ]
Chen, Chao [1 ]
机构
[1] Nanchang Univ, Coll Chem, Key Lab Jiangxi Prov Environm & Energy Catalysis, Nanchang 330031, Jiangxi, Peoples R China
[2] East China Univ Technol, Sch Chem Biol & Mat Sci, Jiangxi Prov Key Lab Polymer Micro Nano Mfg & Dev, Nanchang 330013, Jiangxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Ceria; Oxygen vacancies; Au-Ce-O solid Solution; Amino groups functionalized ordered mesoporous polymer; CO oxidation; Rare earths; CARBON-MONOXIDE; SOLID-SOLUTION; ACTIVE-SITES; NANOPARTICLES; PERFORMANCE; CAPACITY; STORAGE; AU/CEO2;
D O I
10.1016/j.jre.2021.01.0
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Bearing unique redox nature and high oxygen storage capacity, ceria (CeO2) has always been a promising CO oxidation catalyst support for gold (Au) catalysts and the like. Herein, a series of Au-CeO2-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-NH2). Afterward, all samples described above were characterized that the Au-CeO2-P catalysts are made of Au-Ce-O solid solution and Au nanoparticles (NPs) supported on CeO2. It turns out that OMP-NH2 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-CeO2-P catalysts is related to the concentration of their oxygen vacancies. Moreover, Au-CeO2-9.6 with a highest concentration of oxygen vacancies (as high as 13.98%) in Au-CeO2-P catalysts exhibits the best catalytic activity (complete conversion at 10 degrees C). (C) 2021 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:434 / 442
页数:9
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