Abstract
Nanoscale polymer spherical and hollow structure HZSM-5 zeolites are prepared by hydrothermal and desilication–recrystallization methods. In addition, the crystallite size of two types of HZSM-5 can be easily controlled by changing H2O/Si mole ratio. The hollow structure HZSM-5 zeolite is formed, it is due to the 010 crystal plane is the most energetically favorable orientation in silicalite-1 and the Si species is first removed on this crystal plane. The properties of different morphology zeolites were characterized by means of XRD, SEM, TEM, NH3-TPD, N2 isothermal adsorption–desorption and TG, and the catalytic performance of these two types of HZSM-5 in MTA reaction was investigated in a fixed-bed differential reactor. The results showed that the multilevel pore structure and suitable acid strength and more acid density were obtained in the hollow structure HZSM-5 zeolite. Therefore, the hollow HZSM-5 zeolite exhibited that higher catalytic lifetime and selectivity of aromatics than nanoscale polymer spherical HZSM-5 zeolite in MTA reaction. Furthermore, the Al distribution on the 010 crystal plane may change slightly during the process of fabricating hollow mesoporous, which leads to higher selectivity of p-xylene over hollow HZSM-5 than nanoscale polymer spherical HZSM-5 zeolite.
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This work was financially supported by the Youth Science and Technology Foundation of Gansu Province (20JR10RA107) and the Youth Teacher Research Group Foundation of Northwest Normal University (NWNU-LKQN-18-21).
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He, H., Tian, H., Jiao, J. et al. Performance of HZSM-5 prepared by different methods for methanol to aromatics. Reac Kinet Mech Cat 133, 1045–1060 (2021). https://doi.org/10.1007/s11144-021-02041-5
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DOI: https://doi.org/10.1007/s11144-021-02041-5