https://scholars.lib.ntu.edu.tw/handle/123456789/406449
標題: | Real-time Raman monitoring during photocatalytic epoxidation of cyclohexene over V-Ti/MCM-41 catalysts | 作者: | Chan H.-Y. Nguyen V.-H. Wu J.C.S. Calvino-Casilda V. Ba?ares M.A. Bai H. |
關鍵字: | Cyclohexene;Epoxidation;Photocatalysis;Real-time Raman spectroscopy;V-Ti/MCM-41 photocatalyst | 公開日期: | 2015 | 卷: | 5 | 期: | 2 | 起(迄)頁: | 518-533 | 來源出版物: | Catalysts | 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. ? 2015 by the authors, licensee MDPI, Basel, Switzerland. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/406449 | ISSN: | 20734344 | DOI: | 10.3390/catal5020518 |
顯示於: | 化學工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。