Ti incorporation in MCM-41 mesoporous molecular sieves using hydrothermal synthesis

Abstract

Titanium-containing mesoporous materials (Ti-MCM-41) were obtained by hydrothermal synthesis. Such materials are active catalysts for the transesterification of dimethyl oxalate and phenol to produce diphenyl oxalate. To understand the role of the Ti in the catalytic process, Ti-MCM-41 samples with different Si/Ti ratios (from 5 to 100) were prepared and the samples were analyzed by Fourier transform infrared spectroscopy, UV-visible spectroscopy, and ammonia temperature programmed desorption. It was concluded that the Ti is incorporated into the framework of the MCM-41 and formed weak Lewis acid sites. In addition, the number of Ti(IV) sites increased as the amount of titanium increased. X-ray powder diffraction, N₂ adsorption-desorption and transmission electron microscopy results showed that the Ti-MCM-41 samples have a hexagonal arrangement of mono-dimensional pores. A large number of Ti(IV) sites coupled with the mesoporous structure and large pore diameters are favorable for the transesterification catalytic properties of Ti-MCM-41.

Key words： Ti-MCM-41; mesoporous molecular sieve; acid sites; transesterification; hydrothermal synthesis

Acknowledgements

Financial support from the Natural Science Foundation of China (Grant No. 20506018, 21176179), the Program of Introducing Talents of Discipline to Universities (Grant B06006), the National Key Project for the 11^th Five Year Plan (Grant No. 2006BAE02B00), and the Program for New Century Excellent Talents in University (NCET-13-0411) are gratefully acknowledged.

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