Catalytic stability and surface analysis of microcrystalline Ni₃Al thin foils in methanol decomposition

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• 作者：Marta Michalska-Doma艅ska ; Ma艂gorzata Norek ; Pawe艂 J贸藕wik ; Bart艂omiej Jankiewicz ; Wojciech J. St臋pniowski ; Zbigniew Bojar
• 关键词：Ni3Al thin foils ; Methanol decomposition ; Catalytic stability ; Carbon deposit ; Ni nanoparticles
• 刊名：Applied Surface Science
• 出版年：28 February, 2014
• 年：2014
• 卷：293
• 期：Complete
• 页码：169-176
• 全文大小：2552 K

文摘

The research on the development of solid state catalyst is presented. In this study, the catalytic activity and catalytic stability tests of the Ni₃Al thin intermetallic foils in methanol decomposition were investigated. The catalytic activity of Ni₃Al started above 300 掳C, and reached a maximum of methanol conversion (94%) at 500 掳C. Carbon deposit formed during the catalytic tests was analyzed in details by SEM, BET, XRD, and Raman spectroscopy. It was found that the carbon deposit consists of well crystallized, curved multi-walled carbon nanotubes, and amorphous carbon, perhaps in the form of nanofibers, without single-walled carbon nanotubes. Despite the presence of various forms of carbon on the Ni₃Al surface, the catalyst provides a good catalytic stability: even after 17 h of the reaction, the methanol conversion is 90%. At the ends of the obtained nanotubes/nanofibers one can see Ni nanoparticles. Moreover, it has been proven that the Ni nanoparticles are situated inside the carbon nanofibers/nanotubes, as well. The mechanism of the carbon deposit growth on Ni₃Al thin foils was proposed.