Seed Solution-Assisted Synthesis of ZSM-5 Zeolite and Its Catalytic Performance of Trimethylbenzene Isomerization

Abstract

Abstract: The seed solution was synthesized at 100 ℃ using tetrapropylammonium hydroxide as template and commercial silica sol as silicon source. Meanwhile, ZSM-5 zeolites with well crystallinity were successfully synthesized by adding seed solution in the template-free system, and the synthetic conditions of ZSM-5 zeolites were explored. The synthesized zeolites samples were characterized by X-ray powder diffraction (XRD), scanning-electron microscopy (SEM), N₂ adsorption-desorption, fourier transform infrared (FT-IR), X-ray fluorescence spectroscopy (XRF) and ammonium temperature-programmed desorption (NH₃-TPD). The results show that ZSM-5 zeolites are synthesized by adding only 0.5% (mass fraction) seed solution in the template-free system. Meanwhile, submicron-scale ZSM-5 zeolite aggregates with the size of ~500 nm are synthesized at 170 ℃ for 8 h under optimal synthesis conditions. Furthermore, in the isomerization of trimethylbenzene, the sample with n(SiO₂)/n(Al₂O₃) ratio of 30 has better catalytic performance. Mass conversion of 1, 2, 4-trimethylbenzene, mass yield of 1, 3, 5-trimethylbenzene and selectivity of 1, 3, 5-trimethylbenzene are 32.81%, 20.81% and 63.42%, respectively.

Key words: ZSM-5 zeolite, seed solution, green synthesis, template-free, aggregate, isomerization

CLC Number:

TQ426.6

ZHANG Hongzhi, ZHANG Yanting, SONG Jinrui, LIU Jingyi, GAO Yufang, LI Ning, LI Xiaofeng. Seed Solution-Assisted Synthesis of ZSM-5 Zeolite and Its Catalytic Performance of Trimethylbenzene Isomerization[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2563-2578.

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