Seed-induced synthesis of small-crystal TS-1 using ammonia as alkali source

doi:10.1016/S1872-2067(15)60955-X

Abstract

Abstract:

Small-crystal TS-1 was synthesized via a seed-induced approach using ammonia as the alkali source and tetrapropylammonium bromide as an auxiliary structure-directing agent. The TS-1 samples were characterized using X-ray diffraction, N₂ adsorption-desorption, Fourier-transform infrared spectroscopy, inductively coupled plasma atomic emission spectroscopy, scanning electron microscopy, and ultraviolet-visible spectroscopy. The use of the colloidal seed reduced the crystal size, and an appropriate amount of silicalite-1 seed assisted Ti incorporation into the TS-1 framework. This method reduces the cost of TS-1 synthesis because a significantly smaller amount of tetrapropylammonium hydroxide is used. The catalytic performance of the synthesized small-crystal TS-1 samples in cyclohexanone ammoximation was better than that of bulk TS-1 as a result of improved diffusion and a larger number of active tetrahedral Ti centers.

Key words: Small crystal, TS-1 molecular sieve, Seed-induced synthesis, Ammonia, Catalytic oxidation, Cyclohexanone ammoximation

Teng Xue, Huaping Liu, Yimeng Wang, Haihong Wu, Peng Wu, Mingyuan He. Seed-induced synthesis of small-crystal TS-1 using ammonia as alkali source[J]. Chinese Journal of Catalysis, 2015, 36(11): 1928-1935.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)60955-X

https://www.cjcatal.com/EN/Y2015/V36/I11/1928

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