Synthesis, characterization, and catalytic performance of bifunctional titanium silicalite-1

doi:10.1016/S1872-2067(12)60589-0

Abstract

Abstract: A series of bifunctional Ti-molecular sieves (M-TS-1, M = Al, B, or Fe) containing different trivalent ions (Al³⁺, B³⁺, or Fe³⁺), with MFI topology, were synthesized using tetrapropylammonium bromide, silica sol, and n-butylamine as a template, base, and Si source, respectively. The simultaneous presence of Ti and trivalent ions in lattice positions provided catalysts with activity in both oxidation and acid-catalyzed reactions. The samples were characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, ultraviolet-visible spectroscopy, NH₃ temperature-programmed desorption, inductively coupled plasma atomic emission spectroscopy, and N₂ adsorption-desorption isotherms. The results showed that the numbers and strength of acid sites of TS-1 were enhanced by the incorporation of trivalent ions. Using selective oxidation of ethylene as the probe reaction, the catalytic properties of M-TS-1 were investigated. The results showed that Al-TS-1 and B-TS-1 had better catalytic properties; conversion and utilization of H₂O₂ reached 95% and 90%, respectively, and the yield of ethylene glycol plus its monomethyl ether was greater than 10%.

Key words: Titanium silicalite-1, Aluminium, Boron, Iron, Bifunctional catalyst, Ethylene, Selective oxidation

LI Hao, LEI Qian, ZHANG Xiaoming, SUO Jishuan. Synthesis, characterization, and catalytic performance of bifunctional titanium silicalite-1[J]. Chinese Journal of Catalysis, DOI: 10.1016/S1872-2067(12)60589-0.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(12)60589-0

https://www.cjcatal.com/EN/Y2013/V34/I7/1363

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