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Preparation of Titanium Modified TUD-1 Catalysts for Propylene Epoxidation

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Abstract

A three-dimensional sponge-like mesoporous, Ti-TUD-1 catalyst was synthesized by a direct hydrothermal treatment method. Its synthesis was modified to introduce more tetrahedral-coordinated Ti species into the framework of TUD-1 matrix, by controlling the hydrolysis of titanium and silicon sources. The TUD-1 catalyst was characterized by XRD, FT-IR, ICP-AES, UV-Raman, UV–vis DRS, BJH/BET and 29Si MAS NMR analyses, indicating that addition orders of substrate played a crucial role during the Ti-TUD-1 catalyst preparation, indicating the amount of tetrahedral-coordinated Ti species was closely related to the addition order of substrate. The presence of Ti species affected the internal structure and connectivity of TUD-1 matrix. The Ti-TUD-1 catalyst exhibited high catalytic activity, especially good PO selectivity, due to the tetrahedral-coordinated Ti species into the framework of TUD-1 matrix. Furthermore, the effect of the TBOT/TEOS and TEA/TEOS molar ratios, on the catalytic activity was also studied, demonstrating that adequate molar ratios promoted an improvement the catalytic activity. Textural properties of Ti-TUD-1 were related to the addition order of substrate. Ti-TUD-1 catalyst was synthesized by controlling the hydrolysis of titanium and silicon sources. Amount of tetrahedral-coordinated Ti species also depend on the addition order of substrate.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 21376201) and Collaborative Innovation Center of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization.

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Authors and Affiliations

  1. College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, Hunan, China

    Jian Chen, Weiqin Fu, Xia Yuan, Hongyan Zeng & Jian Wu

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  1. Jian Chen
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  2. Weiqin Fu
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  3. Xia Yuan
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  4. Hongyan Zeng
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  5. Jian Wu
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Corresponding authors

Correspondence to Hongyan Zeng or Jian Wu.

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Chen, J., Fu, W., Yuan, X. et al. Preparation of Titanium Modified TUD-1 Catalysts for Propylene Epoxidation. Catal Lett 147, 1263–1270 (2017). https://doi.org/10.1007/s10562-017-2030-8

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  • DOI: https://doi.org/10.1007/s10562-017-2030-8

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