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Citation: HU Jun, WANG Jian-Jun, ZHOU Li-Hui, XIE Song-Hai, LIU Hong-Lai. The Mechanism of Mesoporous Phase Transition of Titanic-Silica Mesoporous Materials[J]. Acta Physico-Chimica Sinica, ;2006, 22(06): 679-683. doi: 10.3866/PKU.WHXB20060607 shu

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

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 Date: 5 January 2006
Available Online: 31 May 2006

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): hexa nal 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).
- Ti-Si mesoporous materials;Mesoporous structure;Phase transition;Cosolvent
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