Catalytic Study of Iron, Aluminum, Vanadium and Cobalt Modified Titanium Silicalites-1 in the Hydroxylation of Benzene and Alkyl Benzene by Hydrogen Peroxide

Abstract

This research studies catalytic properties of TS-1 modified Fe, Al, Co and V in the hydroxylation of benzene and alkyl benzene with hydrogen peroxide. The results show that adding Fe, Al, Co and V can increase the catalytic activity of TS-1 on the hydroxylation of benzene in the following order Co-TS-1 > V-TS-1 > Fe-TS-1 > Al-TS-1 > TS-1. Further investigation reveals that the added metals improve the performance of TS-1 by decreasing the adsorption of phenol on the TS-1 surface, thus prevent the blockage of the active site by the phenol formed. In addition, they also inhibit the decomposition of H2O2, thus providing more H2O2 for the reaction. For the hydroxylation of toluene, it was found that the hydroxygroup can substitute at both ortho and para position producing o-cresol and p- resol respectively.