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Performance of HZSM-5 prepared by different methods for methanol to aromatics.
- Source :
- Reaction Kinetics, Mechanisms & Catalysis; Aug2021, Vol. 133 Issue 2, p1045-1060, 16p
- Publication Year :
- 2021
-
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 H<subscript>2</subscript>O/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, NH<subscript>3</subscript>-TPD, N<subscript>2</subscript> 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18785190
- Volume :
- 133
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Reaction Kinetics, Mechanisms & Catalysis
- Publication Type :
- Academic Journal
- Accession number :
- 151860921
- Full Text :
- https://doi.org/10.1007/s11144-021-02041-5