Abstract
The catalytic transfer hydrogenation (CTH) between alcohol and alkene was investigated over Cu/Al 2O 3 catalyst via mechanical mixture of the supported catalyst and the pure support. It is found that the CTH activities are highly depended on the amount and acid/basic properties of the mechanically mixed support, clearly indicating the assistant role of support. In addition, only alkene with high activity of hydrogenation can really act as hydrogen acceptor. Based on these, a new bifunctional reaction pathway is proposed. Alcohol dehydrogenates to form alkoxide on Al 2O 3 surface (R 1CH(OH)R 2 → R 1CH(O)R 2 + H), and H atom migrates to the metallic Cu patches via reverse hydrogen spillover, while extraction of α-hydrogen forming ketone (R 1CH(O)R 2 → R 1C(O)R 2 + H) occurs on Cu or Cu–Al 2O 3 interface. On the metallic Cu patches, alkene hydrogenates yielding alkane (R 3CH = CHR 4 + 2H → R 3CH 2CH 2R 4). This mechanism can give a better explanation for the observed acceleration or deceleration role of hydrogen acceptor to alcohol dehydrogenation.
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.
