Facilely adjusting acidity features of zeolites by steaming treatment for enhanced methanol conversion to aromatics: A mechanism study

被引：12
作者：
Xu, Zhenjun [1 ]
Fu, Tingjun [1 ]
Han, Yating [1 ]
Li, Zhong [1 ]
Zhan, Guowu [2 ]
机构：
[1] Taiyuan Univ Technol, Coll Chem Engn & Technol, State Key Lab Clean & Efficient Coal Utilizat, Taiyuan 030024, Shanxi, Peoples R China
[2] Huaqiao Univ, Coll Chem Engn, Xiamen 361021, Fujian, Peoples R China
来源：
FUEL | 2023年 / 349卷
基金：
中国国家自然科学基金;
关键词：
Zeolite; Acidity; framework Al site; Streaming treatment; MTA reaction; ZSM-5; ZEOLITES; HIERARCHICAL ZSM-5; Y ZEOLITES; HZSM-5; ALUMINUM; AROMATIZATION; PERFORMANCE; CATALYSTS; H-ZSM-5; FRAMEWORK;
D O I：
10.1016/j.fuel.2023.128671
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
In this contribution, the effects of the steaming treatment on the acidity and aluminum structure of ZSM-5 were systematically investigated by using different types of zeolite catalysts. The relationships between the acid properties and the catalytic performance of the methanol-to-aromatics (MTA) reaction were also elucidated. The results revealed that different kinds of acid sites showed varied stability during the steaming treatment. Especially for Bronsted acid sites (BAS), the reduction of the acid site was highly related to the stability of different distributed framework Al sites (Alsingle > Alpairs) and the existence of non-framework species ("neutralization" by the EFAL and ZnO). Additionally, the presence of the extra-framework aluminum (EFAl) and metal compensation ions could enhance the stability of the zeolite framework Si-O(H)-Al. Besides, it was found that the reduction degree in the content of the Zn-LAS (LAS = Lewis acid sites) was less than the Al-LAS. The effects of steaming treatment on acid properties over zeolites with different particle sizes were also explored. Furthermore, the catalytic performance for the MTA reaction showed that the stability of the ZSM-5 catalyst was significantly enhanced after the steaming treatment. Moreover, the reduction in the proportion of the Alpairs sites may inhibit the hydrogen-transfer aromatization process of alkenes, while the increase of the Alsingle species enhanced the cracking process of higher olefins, leading to the reduction of aromatics selectivity and the increase of light olefins selectivity, respectively.
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页数：15
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