Reforming of cyclohexane and n-heptane on nanosized Mo₂C and W₂C obtained by the carbidization of WO₃ and MoO₃ activated by vibrationally excited molecules of hydrogen

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• 作者：S. D. Arsentev ; V. T. Minasyan…
• 关键词：Nanoparticles ; Catalysis ; Hydrocarbons ; Petroleum ; Carbide
• 刊名：Reaction Kinetics, Mechanisms and Catalysis
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：120
• 期：1
• 页码：219-230
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Catalysis; Physical Chemistry; Industrial Chemistry/Chemical Engineering;
• 出版者：Springer Netherlands
• ISSN：1878-5204
• 卷排序：120

文摘

The catalytic activity of nanosized powders of hexagonal α-Mo₂C and α-W₂C with average particle size of 17 nm obtained by thermal carbidization of MoO₃ and WO₃ oxides in the flow of methane–hydrogen mixture, preliminarily activated by the vibrationally excited molecules of hydrogen was studied. Amorphous powders obtained by this method exhibit high activity associated with structural features. This was a crucial factor for the low-temperature synthesis of nanosized carbides (500 °C for Mo₂C and 600 °C for W₂C). It was shown that nanosized carbides exhibit high catalytic activity in cyclohexane dehydrogenation yielding benzene, and cyclodehydrogenation of n-heptane yielding toluene. The analysis of the obtained data allow to conclude that the observed drastic difference in activity and selectivity of the carbides with nano- and microsized particles is conditioned by the effect of nanocarbides particle size and defects of structure that have been formed during low-temperature synthesis. The synthesized carbide catalysts are stable in air and keep their catalytic activity over a long period.