Dehydrogenation of cyclohexene over carbon deposited on alumina

文献信息

发布日期 2001-02-05

DOI 10.1039/B008895L

影响因子 3.676

作者

Hidefumi Amano, Satoshi Sato, Ryoji Takahashi, Toshiaki Sodesawa

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摘要

The dehydrogenation of cyclohexene over carbon deposited on alumina, C/Al2O3, which was prepared by contacting hydrocarbons such as cyclohexane, cyclohexene and cyclohexanone with alumina surface at ≥823 K, was investigated under non-oxidative conditions. The deposited carbon was identified as condensed aromatic hydrocarbon with graphite-like structure in the results of XRD and 13C NMR measurements. It was found that the dehydrogenation activity was generated on alumina by carbon deposition: the dehydrogenation of cyclohexene proceeded over C/Al2O3 at 773 K, while the isomerization to methylcyclopentenes proceeded over pure alumina without carbon. The selectivity to dehydrogenated products such as benzene and 1,3-cyclohexadiene was maximized at a specific carbon content. The disproportionation of cyclohexene into benzene and cyclohexane proceeded over C/Al2O3 above the specific carbon content. Unpaired electrons observed in the EPR measurement are related to the ratio of dehydrogenation and disproportionation, whereas the dehydrogenation activity is not related with the unpaired electron content.

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来源期刊

Physical Chemistry Chemical Physics

CiteScore: 5.5

自引率: 10.3%

年发文量: 3036

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