Abstract
The liquid-phase oxygenation of benzene was studied using supported vanadium(V) catalysts. Molecular oxygen and ascorbic acid were used as the oxidant and reducing reagent, respectively. The reduced vanadium species is suggested to be the active catalytic species in this reaction system. The catalytic activity of the supported V catalysts for phenol formation was found to be somewhat higher than those of supported Cu counterparts. The addition of Cu ions to the supported V catalyst caused an increase in the yield of phenol. The leaching of the catalytically active V species from the support during the liquid-phase oxidation was also inhibited by the addition of Cu ions to the supported V catalysts. The concentration of acetic acid in the aqueous solvent was found to have an optimum value for the phenol production. The formation of hydrogen peroxide was observed during the benzene oxidation catalyzed by the supported V catalyst, and the accumulated amount of the formed hydrogen peroxide was quantitatively detected by iodometry. The electronic absorption spectra of the reaction solution including the V species also indicated the formation of hydrogen peroxide during the benzene oxidation. The produced hydrogen peroxide was suggested to directly participate in the phenol formation from benzene.
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 callMore From: Journal of the Chemical Society, Perkin Transactions 2
Disclaimer: 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.
