Catalytic Study of Iron, Aluminum, Vanadium and Cobalt Modified Titanium Silicalites-1 in the Hydroxylation of Benzene and Alkyl Benzene by Hydrogen Peroxide
Pornnapa Kasemsiri, Kriangkrai Shenchunthichai, Patchanee Chammingkwanand Tharathon Mongkhonsi* Author for corresponding; e-mail address: kae_en_39@hotmail.com
Volume: Vol.35 No.1 (JANUARY 2008)
Research Article
DOI:
Received: 15 September 2007, Revised: -, Accepted: 17 November 2007, Published: -
Citation: Kasemsiri P., Shenchunthichai K. and Mongkhonsi P.C.T., Catalytic Study of Iron, Aluminum, Vanadium and Cobalt Modified Titanium Silicalites-1 in the Hydroxylation of Benzene and Alkyl Benzene by Hydrogen Peroxide, Chiang Mai Journal of Science, 2008; 35(1): 178-187.
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