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题名: Catalytic activities and mechanism of formaldehyde oxidation over gold supported on MnO2 microsphere catalysts at room temperature
作者: Pang, Guanglong; Wang, Donghui; Zhang, Yunhong; Ma, Chunyan; Hao, Zhengping
刊名: FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
出版日期: 2016-06
卷号: 10, 期号:3, 页码:447-457
关键词: MnO2 microspheres ; Au/MnO2 ; formaldehyde oxidation ; gamma-MnO2
DOI: 10.1007/s11783-015-0808-8
部门归属: 环境纳米材料实验室
英文摘要: 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 gamma-MnO2 shows high catalytic performance. The excellent redox properties are responsible for the catalytic ability of gamma-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.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35987
Appears in Collections:环境纳米材料实验室_期刊论文

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