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Open AccessArticle

Real-Time Raman Monitoring during Photocatalytic Epoxidation of Cyclohexene over V-Ti/MCM-41 Catalysts

1
Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
2
Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
3
Catalytic Spectroscopy Laboratory, Instituto de Catalisis, ICP-CSIC, E-28049 Madrid, Spain
4
Institute of Environmental Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
*
Author to whom correspondence should be addressed.
Current Address: Departamento de Quimica Inorganica y Quimica Tecnica, UNED, 28040 Madrid, Spain
Academic Editor: Keith Hohn
Catalysts 2015, 5(2), 518-533; https://doi.org/10.3390/catal5020518
Received: 28 November 2014 / Revised: 6 March 2015 / Accepted: 17 March 2015 / Published: 30 March 2015
(This article belongs to the Special Issue Feature Papers to Celebrate the Landmarks of Catalysts)
A series of V- and/or Ti-loading MCM-41 catalysts are successfully synthesized with a hydrothermal method. The photocatalytic and thermal epoxidations of cyclohexene in the presence of tert-butyl hydroperoxide (t-BuOOH) were investigated with real-time monitored by NIR-Raman spectroscopy. It suggests that both V- and Ti-loading can be responsible for the cyclohexene epoxidation. Moreover, the complementary behavior of V- and Ti-loading may be related to a similar role of activation. Interestingly, the progress of the photo-epoxidation on V0.25Ti2/MCM-41 photocatalyst was monitored by changes in intensity of the characteristic Raman bands without interference from the UV-light irradiation. The result, for the first time, reveals that cyclohexene was directly photo-epoxidized to 1,2-epoxycyclohexane by t-BuOOH during the reaction. A possible mechanism of cyclohexene photo-epoxidation is also proposed for this study. View Full-Text
Keywords: cyclohexene; epoxidation; photocatalysis; V-Ti/MCM-41 photocatalyst; real-time Raman spectroscopy cyclohexene; epoxidation; photocatalysis; V-Ti/MCM-41 photocatalyst; real-time Raman spectroscopy
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Chan, H.-Y.; Nguyen, V.-H.; Wu, J.C.; Calvino-Casilda, V.; Bañares, M.A.; Bai, H. Real-Time Raman Monitoring during Photocatalytic Epoxidation of Cyclohexene over V-Ti/MCM-41 Catalysts. Catalysts 2015, 5, 518-533.

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