Citation: Kun REN, Liang-Liang ZHANG, Zhong LI, Ting-Jun FU. Structure-Activity Relationship and Reaction Characteristics of Propene Aromatization Catalyzed by ZSM-5[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(6): 1090-1102. doi: 10.11862/CJIC.2022.115 shu

Structure-Activity Relationship and Reaction Characteristics of Propene Aromatization Catalyzed by ZSM-5

State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China

Corresponding author: Zhong LI, lizhong@tyut.edu.cn Ting-Jun FU, futingjun@tyut.edu.cn
Received Date: 7 March 2022
Revised Date: 1 April 2022

Figures(11)

Aromatization of light olefins in methanol to aromatics via a two-step route showed better catalytic stability. To analyze the intrinsic mechanism, a series of ZSM-5 catalysts with different SiO₂/Al₂O₃ ratios and Zn modified were prepared. Then propene aromatization, as the model reaction, was performed to analyze the effects of acidity on aromatization of light olefins and explore the reaction mechanism. The results illustrated that the increased acid density was in favor of the hydrogen transfer process, resulting in an increase of aromatics selectivity from 31.0% to 34.4% with the SiO₂/Al₂O₃ ratio decreased from 150 to 75. Meanwhile, an increase in acid density will cause more propene to directly participate in the hydrogen transfer reaction to produce propane which was enhanced from 28.2% to 36.0%. Further introducing Zn could transform some Brønsted acid sites into Zn-Lewis acid sites, the aromatics selectivity was further significantly increased to 62.4% with the enhancement of the alkenes dehydrogenation aromatization process. Compared with direct methanol aromatization, propene aromatization had a less deep alkylation process, which not only increased the aromatics selectivity, but also inhibited the formation of insoluble coke, and improved the catalytic stability. These results suggested that the pre-conversion of methanol in methanol to light olefins was an important reason for the high catalytic stability of two-step methanol conversions, which inhibited the deep alkylation of aromatics in the subsequent aromatization process.
- light olefins,
- aromatization,
- ZSM-5 zeolites,
- catalytic performance,
- acidic properties
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