Citation: CUI Li-ping, WANG Cheng-xiong, ZHAO Yun-kun, LI Zhong, YANG Dong-hua. Synthesis of core-shell structured MFI-type composite zeolites by isomorphous epitaxial growth[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(9): 1145-1152. shu

Synthesis of core-shell structured MFI-type composite zeolites by isomorphous epitaxial growth

1.
Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China
2.
State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China

Corresponding author: LI Zhong, lizhong@tyut.edu.cn
Received Date: 3 March 2016
Revised Date: 12 June 2016

Fund Project: the Science and Technology Infrastructure Platform Construction Program of Shanxi Province 2015091009

Figures(9)

MFI/MFI core-shell composite zeolites with a low-silica ZSM-5 core and a high-silica shell were successfully synthesized by secondary hydrothermal crystallization on the low-silica ZSM-5 cores that was pretreated with a basic TPAOH aqueous solution; the preparation parameters for shell growth including the pH value, water amount, and crystallization time were well considered. The crystal structure, surface morphology, core/shell interface, textural properties and surface acidity of the resultant core-shell zeolites were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectrometer, transmission electron microscopy, N₂ physisorption and NH₃ temperature programmed desorption. The results indicated that in the core-shell composite zeolites, high-silica ZSM-5 shell with a particle size of 200 nm is well developed on the surface of core crystal. The growth of ZSM-5 shell results in an increase of external surface area, decrease of external acid density and increase of weak acid sites without influencing pore structure. The isomorphous epitaxial growth of high-silica ZSM-5 shells can be effectively controlled under the conditions of a pH value of 8.5, H₂O/SiO₂ mol ratio of 30 and crystallization for 24 h during the secondary crystallization.
- ZSM-5,
- secondary crystallization,
- core/shell structure,
- composite zeolite,
- surface acidity
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