Synthesis of Micro-Mesoporous Ti-MOR/Silica Composite Spheres in Oil-in-Water Microemulsion System

doi:10.1007/s40242-021-1321-1

Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (1): 192-199.doi: 10.1007/s40242-021-1321-1

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Synthesis of Micro-Mesoporous Ti-MOR/Silica Composite Spheres in Oil-in-Water Microemulsion System

XU Hao, WANG Yanhong, PENG Rusi, JIANG Jingang, ZHANG Kun, WU Peng

Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China

Received:2021-08-18 Revised:2021-09-07 Online:2022-02-01 Published:2022-01-20
Contact: ZHANG Kun, WU Peng E-mail:Kzhang@chem.ecnu.edu.cn；pwu@chem.ecnu.edu.cn
Supported by:
This work was supported by the Project of China Ministry of Science and Technology(No.2021YFA1501401), the National Natural Science Foundation of China(Nos.21972044, 21872052) and the Fundamental Research Funds for the Central Universities, China.

Abstract

Abstract: The hierarchically structured micro-mesoporous spheres(MMS) composed of mesoporous silica and Ti-containing mordenite (Ti-MOR) zeolite were self-assembled in an oil-in-water microemulsion system containing tetrabutyl orthosilicate as silica source, cetyltrimethylammonium bromide as template and aluminum sulfate as additive. The composite materials possessed the connatural microporosity of zeolite together with the disordered mesopores(5.41 nm) in silica part. With a special focus on the importance of aluminum sulfate additive, a possible formation mechanism has been proposed, in which double electrostatic interactions played the crucial role of mediating the mesosilica species and zeolite crystals. The obtained MMS materials, with a tunable particle dimension(250-720 μm) and a changeable content of active component Ti-MOR(44%-70%), showed enhanced catalytic activity and lifetime in the liquid-phase ammoximation of cyclohexanone in comparison to the parent Ti-MOR powder.

Key words: Micro-mesoporous composite sphere, Microemulsion, Mordenite, Aluminum sulfate, Double electrostatic interaction

XU Hao, WANG Yanhong, PENG Rusi, JIANG Jingang, ZHANG Kun, WU Peng. Synthesis of Micro-Mesoporous Ti-MOR/Silica Composite Spheres in Oil-in-Water Microemulsion System[J]. Chemical Research in Chinese Universities, 2022, 38(1): 192-199.

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Synthesis of Micro-Mesoporous Ti-MOR/Silica Composite Spheres in Oil-in-Water Microemulsion System

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