標題: 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
環境工程研究所
Institute of Environmental Engineering
關鍵字: cyclohexene;epoxidation;photocatalysis;V-Ti;MCM-41 photocatalyst;real-time Raman spectroscopy
公開日期: 1-Jun-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
起始頁: 518
結束頁: 533
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