Sulfated and Persulfated TiO2/MCM-41 Prepared by Grafting Method and their Acid-catalytic Activities for Cyclization of Pseudoionone |
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| Authors: | Dai-Shi Guo Zi-Feng Ma Qi-Zhong Jiang Hai-Hong Xu Zheng-Fei Ma Wei-Dong Ye |
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| Affiliation: | (1) Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China;(2) College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing, 210009, P.R. China;(3) Xinchang Pharmaceutical Factory, Zhejiang Pharmaceutics Co. Ltd., Xinchang, 312500, P.R. China |
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| Abstract: | Solid acid catalysts of SO42−/TiO2/MCM-41 and S2O82−/TiO2/MCM-41 were prepared via grafting method and sulfate/persulfate promotion. The catalysts exhibited desirable activity and
better selectivity for cyclization reaction of pseudoionone compared to traditional SO42−/TiO2. A combination of XRD, N2 adsorption–desorption and FTIR spectroscopy indicated that the catalysts possess well-ordered mesostructure, and the grafted
TiO2 are in highly dispersed amorphous form rather than crystalline phase. For S2O82−/TiO2/MCM-41 higher S content and more Br?nsted acid sites can be achieved by persulfation, which is favorable for the protons
participated cyclization reaction. The similar Si–O–Ti–O–S=O structure of all acid sites on pore surface of the catalysts
is attributed to the improvement of selectivity in comparison with SO42−/TiO2. |
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| Keywords: | grafted TiO2 sulfate/persulfate promotion MCM-41 cyclization of pseudoionone |
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