State of titanium in Ti-containing silica and silicalite catalysts in relation to their oxidation activity |
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| Authors: | T. Ito H. Kanai T. Nakai S. Imamura |
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| Affiliation: | (1) School of Social Information Studies, Otsum Woman's University, Kamioyamanda 9-1, Karakida, 206 Tama, Tokyo, Japan;(2) Faculty of Life Science, Kyoto Prefectural University, Shimogamo, Sakyo-ku, 606 Kyoto, Japan;(3) Department of Chemistry, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan |
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| Abstract: | The nature of active titanium species for epoxidation of olefins with H2O2 and t-butyl hydroperoxide has been investigated for titanium silicalite (TS-1), titania silica (TiO2/SiO2) prepared by a sol-gel method, and titanium oxide supported on silica by a CVD method (TiO2/SiO2-CVD). IR and XANES analyses suggested that Ti in TiO2/SiO2 and TiO2/SiO2-CVD has a tetrahedral configuration bonded to SiO2 and that in TS-1 has a configuration composed of >Ti=O or related to it. Their configurations are closely related to their reactivities for epoxidation of olefins in which the former works with t-butyl hydroperoxide and the latter with H2O2. |
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