Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Catalytic activities and mechanism of formaldehyde oxidation over gold supported on $ MnO_{2} $ microsphere catalysts at room temperature
Abstract $ MnO_{2} $ microspheres with various surface structures were prepared using the hydrothermal method, and Au/$ MnO_{2} $ catalysts were synthesized using the sol-gel method. We obtained three $ MnO_{2} $ microspheres and Au/$ MnO_{2} $ 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_{2} $ are the main factor affecting the catalytic activities of these samples, and γ-$ MnO_{2} $ shows high catalytic performance. The excellent redox properties are responsible for the catalytic ability of γ-$ MnO_{2} $. The gold-supported interaction can change the redox properties of catalysts and accelerate surface oxygen species transition, which can account for the catalytic activity enhancement of Au/$ MnO_{2} $. 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_{2} $. A proposed mechanism of formaldehyde oxidation over Au/$ MnO_{2} $ catalysts was also obtained.
Catalytic activities and mechanism of formaldehyde oxidation over gold supported on $ MnO_{2} $ microsphere catalysts at room temperature
Abstract $ MnO_{2} $ microspheres with various surface structures were prepared using the hydrothermal method, and Au/$ MnO_{2} $ catalysts were synthesized using the sol-gel method. We obtained three $ MnO_{2} $ microspheres and Au/$ MnO_{2} $ 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_{2} $ are the main factor affecting the catalytic activities of these samples, and γ-$ MnO_{2} $ shows high catalytic performance. The excellent redox properties are responsible for the catalytic ability of γ-$ MnO_{2} $. The gold-supported interaction can change the redox properties of catalysts and accelerate surface oxygen species transition, which can account for the catalytic activity enhancement of Au/$ MnO_{2} $. 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_{2} $. A proposed mechanism of formaldehyde oxidation over Au/$ MnO_{2} $ catalysts was also obtained.
Catalytic activities and mechanism of formaldehyde oxidation over gold supported on $ MnO_{2} $ microsphere catalysts at room temperature
Pang, Guanglong (Autor:in) / Wang, Donghui (Autor:in) / Zhang, Yunhong (Autor:in) / Ma, Chunyan (Autor:in) / Hao, Zhengping (Autor:in)
2015
Aufsatz (Zeitschrift)
Englisch
MnO , Au/MnO , microspheres , formaldehyde oxidation , γ-MnO
| British Library Online Contents | 2016
| British Library Online Contents | 2016
| British Library Online Contents | 2016