Catalytic activities and mechanism of formaldehyde oxidation over gold supported on MnO2 microsphere catalysts at room temperature
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- 作者：Guanglong Pang ; Donghui Wang ; Yunhong Zhang…
- 关键词：MnO2 microspheres ; Au/MnO2 ; formaldehyde oxidation ; γ ; MnO2
- 刊名：Frontiers of Environmental Science & Engineering
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：10
- 期：3
- 页码：447-457
- 全文大小：1,154 KB
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Donghui Wang (3)
Yunhong Zhang (1)
Chunyan Ma (2)
Zhengping Hao (2)
1. Institute of Chemical Physics, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, China
2. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
3. Research Institute of Chemical Defense, Beijing, 100191, China - 刊物主题：Environment, general;
- 出版者：Springer Berlin Heidelberg
- ISSN：2095-221X
文摘
MnO2 microspheres with various surface structures were prepared using the hydrothermal method, and Au/MnO2 catalysts were synthesized using the sol-gel method. We obtained three MnO2 microspheres and Au/MnO2 samples: coherent solid spheres covered with wire-like nanostructures, solid spheres with nanosheets, and hierarchical hollow microspheres with nanoplatelets and nanorods. We investigated the properties and catalytic activities of formaldehyde oxidation at room temperature. Crystalline structures of MnO2 are the main factor affecting the catalytic activities of these samples, and γ-MnO2 shows high catalytic performance. The excellent redox properties are responsible for the catalytic ability of γ-MnO2. The gold-supported interaction can change the redox properties of catalysts and accelerate surface oxygen species transition, which can account for the catalytic activity enhancement of Au/MnO2. We also studied intermediate species. The dioxymethylene (DOM) and formate species formed on the catalyst surface were considered intermediates, and were ultimately transformed into hydrocarbonate and carbonate and then decomposed into CO2. A proposed mechanism of formaldehyde oxidation over Au/MnO2 catalysts was also obtained.