Low-temperature CO oxidation over Au/ZnO/SiO2 catalysts:: Some mechanism insights

被引：83
作者：
Qian, Kun [1 ,2 ]
Huang, Weixin [1 ,2 ]
Fang, Jun [1 ,2 ]
Lv, Shanshan [1 ,2 ]
He, Bo [3 ]
Jiang, Zhiquan [1 ,2 ]
Wei, Shiqiang [3 ]
机构：
[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
[2] Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China
[3] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China
来源：
JOURNAL OF CATALYSIS | 2008年 / 255卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Au/ZnO/SiO2; catalyst; CO oxidation; reaction mechanism; metal-support interaction;
D O I：
10.1016/j.jcat.2008.02.012
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report a new type of supported An catalyst active in low-temperature CO oxidation. Au/ZnO/SiO2 catalysts were prepared by routine deposition-precipitation with ammonium hydroxide (Au/ZnO/SiO2-NH3) and aqueous solution of Na2CO3 (Au/ZnO/SiO2-Na2CO3) as the precipitation agent. The catalysts were characterized by BET surface area, X-ray diffraction, transmission electron microscopy, X-ray photoemission spectroscopy, photoluminescence spectroscopy, and X-ray absorption spectroscopy. Au/ZnO/SiO2-Na2CO3 is more active than Au/ZnO/SiO2NH3, achieving a complete CO conversion at 303 K. The structures of Au nanoparticles and ZnO are strongly affected by the Au-ZnO interaction in Au/ZnO/SiO2 catalysts. The Au-ZnO interaction is stronger, and thus,the An nanoparticles are more highly dispersed in Au/ZnO/SiO2-Na2CO3 than in Au/ZnO/SiO2-NH3. Our results suggest that CO oxidation catalyzed by supported Au nanoparticles follows different mechanisms at low and high reaction temperatures and that a weakly chemisorbed species is involved in low-temperature CO oxidation. (c) 2008 Elsevier Inc. All rights reserved.
引用
收藏
页码：269 / 278
页数：10
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