Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/95317
Title: Ti-containing MCM-41 catalysts for liquid phase oxidation of cyclohexene with aqueous H2O2 and tert-butyl hydroperoxide
Authors: Chen, L.Y. 
Chuah, G.K. 
Jaenicke, S. 
Keywords: Aqueous h2o2
Selective oxidation
Tert-butyl hydroperoxide (tbhp)
Ti leaching
Ti-containing mcm-41
Issue Date: 1998
Source: Chen, L.Y.,Chuah, G.K.,Jaenicke, S. (1998). Ti-containing MCM-41 catalysts for liquid phase oxidation of cyclohexene with aqueous H2O2 and tert-butyl hydroperoxide. Catalysis Letters 50 (3-4) : 107-114. ScholarBank@NUS Repository.
Abstract: Framework Ti-substituted and Ti-grafted MCM-41 mesoporous material has been prepared by direct hydrothermal synthesis and a post-synthesis grafting method. The materials have been tested as catalysts for cyclohexene oxidation with aqueous H2O2 and tert-butyl hydroperoxide (TBHP). With aqueous H2O2 in methanol, the major products were cyclohexene diol and its methyl ethers. No cyclohexene oxide was produced. Titanium leaching was a serious problem, and the catalyst lost its activity irreversibly after only one cycle of reaction. With TBHP, the selectivity for cyclohexene oxide was near 100%, titanium leaching was negligible, and the catalyst could be repeatedly used after regeneration without suffering significant activity loss. However, the reaction rate was lower than when H2O2 was used. Framework substituted material and catalysts prepared by Ti-grafting onto a MCM-41 support behaved similar, but the Ti-grafted MCM-41 is somewhat more active. The turnover frequency (TOF) per mole of Ti decreases with an increase of Ti content in the catalyst. This is caused by a reduced Ti dispersion within the silica matrix.
Source Title: Catalysis Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/95317
ISSN: 1011372X
Appears in Collections:Staff Publications

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