Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (06): 679-683.doi: 10.3866/PKU.WHXB20060607

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The Mechanism of Mesoporous Phase Transition of Titanic-Silica Mesoporous Materials

HU Jun;WANG Jian-Jun;ZHOU Li-Hui;XIE Song-Hai;LIU Hong-Lai   

  1. Department of Chemistry and Laboratory for Advanced Materials, East China University of Science and Technology, Shanghai 200237, P. R. China; Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, P. R. China
  • Received:2006-01-05 Revised:2006-01-24 Published:2006-05-31
  • Contact: LIU Hong-Lai

Abstract: A series of titanic-silica mesoporous materials have been synthesized by using the Gemini surfactant [C16H33(CH3)2N+(CH2)6N+(CH3)2C16H33]•2Br− (GEM16-6-16) as a template. The XRD patterns and TEM images provide the evidence that the mesoporous phases are changed according to the following path by varying the molar ratio of n(Ti)/n(Si): hexagonal mesoporous structures are obtained when n(Ti)/n(Si)≤0.20; cubic when n(Ti)/n(Si)=0.30; lamellar when n(Ti)/n(Si)=0.50; and amorphous when n(Ti)/n(Si)=1.0. The FT-IR spectra suggest that the amount of Ti—O—Si bonds in the framework increases with increasing n(Ti)/n(Si) initially, and reaches to a limit when n(Ti)/n(Si)≥0.20. Additionally, the ethanol and butanol have been approved that they can control the evolvement of silica mesoporous phase transition. Following that, the process of titanic-silica mesoporous phase transition has been elucidated by the aggregation of Ti—O—Si bonds and the effect of butanol produced from the hydrolysis of tetrabutyl titanate(TBOT).

Key words: Ti-Si mesoporous materials, Mesoporous structure, Phase transition, Cosolvent