标题: | Real-Time Raman Monitoring during Photocatalytic Epoxidation of Cyclohexene over V-Ti/MCM-41 Catalysts |
作者: | Chan, Hsiang-Yu Van-Huy Nguyen Wu, Jeffrey C. S. Calvino-Casilda, Vanesa Banares, Miguel A. Bai, Hsunling 环境工程研究所 Institute of Environmental Engineering |
关键字: | cyclohexene;epoxidation;photocatalysis;V-Ti;MCM-41 photocatalyst;real-time Raman spectroscopy |
公开日期: | 1-六月-2015 |
摘要: | 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. |
URI: | http://dx.doi.org/10.3390/catal5020518 http://hdl.handle.net/11536/127902 |
ISSN: | 2073-4344 |
DOI: | 10.3390/catal5020518 |
期刊: | CATALYSTS |
Volume: | 5 |
Issue: | 2 |
起始页: | 518 |
结束页: | 533 |
显示于类别: | Articles |
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