Direct synthesis and characterization of titanium-substituted mesoporous molecular sieve SBA-15

Wen Hua Zhang, Jiqing Lu, Bo Han, Meijun Li, Jinghai Xiu, Pinliang Ying, Can Li

Research output: Contribution to journalArticlepeer-review

311 Scopus citations

Abstract

Ti-substituted mesoporous SBA-15 (Ti-SBA-15) materials have been synthesized by using a new approach in which the hydrolysis of the silicon precursor (tetramethoxysilane, TMOS) is accelerated by fluoride. These materials were characterized by powder X-ray diffraction patterns (XRD), X-ray fluorescence spectroscopy (XRF), N2 sorption isotherms, diffusereflectance UV-visible (UV-vis) and UV-Raman spectroscopy, 29Si MAS NMR, and the catalytic epoxidation reaction of styrene. Experiments show that Ti-SBA-15 samples of high quality can be obtained under the following conditions: F/Si ≥ 0.03 (molar ratio), pH ≤ 1.0, aging temperature ≤ 80°C, and Ti/Si ≤ 0.01. It was found that the hydrolysis rate of TMOS was remarkably accelerated by fluoride, which was suggested to play the main role in the formation of Ti-SBA-15 materials of high quality. There is no stoichiometric incorporation of Ti, and the Ti contents that are obtained are quite low in the case of the approach that is proposed. The calcined Ti-SBA-15 materials show highly catalytic activity in the epoxidation of styrene.

Original languageEnglish
Pages (from-to)3413-3421
Number of pages9
JournalChemistry of Materials
Volume14
Issue number8
DOIs
StatePublished - Aug 2002
Externally publishedYes

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