?Dai-shi Guo, Zi-feng Ma, Chun-sheng Yin, Qi-zhong Jiang. Preparation and Acid Catalytic Activity of TiO2 Grafted Silica MCM-41 with Sulfate Treatment[J]. Chinese Journal of Chemical Physics , 2008, 21(1): 21-25. doi: 10.1088/1674-0068/21/01/21-26
Citation: ?Dai-shi Guo, Zi-feng Ma, Chun-sheng Yin, Qi-zhong Jiang. Preparation and Acid Catalytic Activity of TiO2 Grafted Silica MCM-41 with Sulfate Treatment[J]. Chinese Journal of Chemical Physics , 2008, 21(1): 21-25. doi: 10.1088/1674-0068/21/01/21-26

Preparation and Acid Catalytic Activity of TiO2 Grafted Silica MCM-41 with Sulfate Treatment

doi: 10.1088/1674-0068/21/01/21-26
Funds:  This work was supported by the National Basic Research Program of China (No.2007CB209705), and the Science & Technology Commission of Shanghai Municipality (No.06SN07115 and No.065211020).
  • Received Date: 2007-03-14
  • Rev Recd Date: 2007-07-16
  • TiO2 grafted silica MCM-41 catalyst with and without sulfate treatment were prepared. The structural and acid properties of these materials were investigated by XRD, N2 adsorption-desorption, element analysis, thermal analysis, Raman and FTIR measurements. Their acid-catalytic activities were evaluated using the cyclization reaction of pseudoionone. It was found that the obtained materials possess well-ordered mesostructure, and the grafted TiO2 components were in highly dispersed amorphous form. T/MCM41 without sulfation contained only Lewis acid sites, while Br?nsted and Lewis acidities were remarkably improved for the sulfated materials ST/MCM41 and d-ST/MCM41. T/MCM-41 was not active for the cyclization reaction of pseudoionone, but ST/MCM-41 and d-ST/MCM-41 possessed favorable catalytic activities. The catalytic performance of ST/MCM-41 was comparable with that of the commercial solid acid catalyst of Amberlyst-15, and better than that of d-ST/MCM-41, although the latter underwent a second TiO2 grafting process and accordingly had higher Ti and S content. The specific surface structure of Si-O-Ti-O-S=O in ST/MCM-41 and the bilateral induction effect of Si and S=O on Si-O-Ti bonds were speculated to account for its higher acid catalytic activity.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Preparation and Acid Catalytic Activity of TiO2 Grafted Silica MCM-41 with Sulfate Treatment

doi: 10.1088/1674-0068/21/01/21-26
Funds:  This work was supported by the National Basic Research Program of China (No.2007CB209705), and the Science & Technology Commission of Shanghai Municipality (No.06SN07115 and No.065211020).

Abstract: TiO2 grafted silica MCM-41 catalyst with and without sulfate treatment were prepared. The structural and acid properties of these materials were investigated by XRD, N2 adsorption-desorption, element analysis, thermal analysis, Raman and FTIR measurements. Their acid-catalytic activities were evaluated using the cyclization reaction of pseudoionone. It was found that the obtained materials possess well-ordered mesostructure, and the grafted TiO2 components were in highly dispersed amorphous form. T/MCM41 without sulfation contained only Lewis acid sites, while Br?nsted and Lewis acidities were remarkably improved for the sulfated materials ST/MCM41 and d-ST/MCM41. T/MCM-41 was not active for the cyclization reaction of pseudoionone, but ST/MCM-41 and d-ST/MCM-41 possessed favorable catalytic activities. The catalytic performance of ST/MCM-41 was comparable with that of the commercial solid acid catalyst of Amberlyst-15, and better than that of d-ST/MCM-41, although the latter underwent a second TiO2 grafting process and accordingly had higher Ti and S content. The specific surface structure of Si-O-Ti-O-S=O in ST/MCM-41 and the bilateral induction effect of Si and S=O on Si-O-Ti bonds were speculated to account for its higher acid catalytic activity.

?Dai-shi Guo, Zi-feng Ma, Chun-sheng Yin, Qi-zhong Jiang. Preparation and Acid Catalytic Activity of TiO2 Grafted Silica MCM-41 with Sulfate Treatment[J]. Chinese Journal of Chemical Physics , 2008, 21(1): 21-25. doi: 10.1088/1674-0068/21/01/21-26
Citation: ?Dai-shi Guo, Zi-feng Ma, Chun-sheng Yin, Qi-zhong Jiang. Preparation and Acid Catalytic Activity of TiO2 Grafted Silica MCM-41 with Sulfate Treatment[J]. Chinese Journal of Chemical Physics , 2008, 21(1): 21-25. doi: 10.1088/1674-0068/21/01/21-26

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