Abstract
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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
