Frontiers of Environmental Science & Engineering
>> 2016,
Volume 10,
Issue 3
doi:
10.1007/s11783-015-0808-8
RESEARCH ARTICLE
Catalytic activities and mechanism of formaldehyde oxidation over gold supported on MnO
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
Accepted: 2015-07-20
Available online: 2016-04-05
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Abstract
MnO microspheres with various surface structures were prepared using the hydrothermal method, and Au/MnO catalysts were synthesized using the sol-gel method. We obtained three MnO microspheres and Au/MnO 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 MnO are the main factor affecting the catalytic activities of these samples, and γ-MnO shows high catalytic performance. The excellent redox properties are responsible for the catalytic ability of γ-MnO . 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/MnO . 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 CO . A proposed mechanism of formaldehyde oxidation over Au/MnO catalysts was also obtained.
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