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Catalysts 2015, 5(2), 518-533; doi:10.3390/catal5020518

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
Current Address: Departamento de Quimica Inorganica y Quimica Tecnica, UNED, 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Keith Hohn
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)
View Full-Text   |   Download PDF [2174 KB, uploaded 30 March 2015]   |  

Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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