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Citation: KONG De-Jin, ZOU Wei, ZHENG Jun-Lin, QI Xiao-Lan, FANG Ding-Ye. Crystallization Kinetics and Influencing Factors in the Syntheses of MFI/MFI Core-Shell Zeolites[J]. Acta Physico-Chimica Sinica, ;2009, 25(09): 1921-1927. doi: 10.3866/PKU.WHXB20090919 shu

Crystallization Kinetics and Influencing Factors in the Syntheses of MFI/MFI Core-Shell Zeolites

1.
College of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

Received Date: 24 March 2009
Available Online: 20 July 2009

MFI/MFI core-shell zeolites with a low silica to alumina ratio core and a continuous shell of high silica to alumina ratio were successfully synthesized by a novel two-step procedure. This was done by a secondary growth of the ZSM-5 shell onto the modified ZSM-5 crystals and the pre-treatment step played an important role during the synthesis. Critical factors for the growth of the ZSM-5 shell including synthesis temperatures, periods, and core dosages were summarized. Results from cumene and 1,3,5-triisopropylbenzene (1,3,5-TIPB) cracking reactions showed that the core-shell zeolite and the core crystal had comparable activities for the cumene cracking reaction. Compared to the core crystal, the cracking activity of 1,3,5-TIPB of the core-shell zeolite was reduced by 68%, which coincided with the extent of aluminum reduction on the external surface. These results suggested that the acidity of the core crystals was largely preserved in the MFI/MFI core-shell structure. Crystallization kinetics curves were determined at different synthesis temperatures. The apparent energy of crystallization activation was found to be 26.5 kJ·mol-1 and the activation
energy of nucleation was 51.5 kJ·mol-1.
- Crystallization kinetics,
- ZSM-5,
- MFI/MFI,
- Core-shell zeolite,
- Nucleation activation energy,
- Crystallization activation energy
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