Correlation of Bronsted acid sites and Al distribution in ZSM-5 zeolites and their effects on butenes conversion

被引：15

作者：

Yi, Fengjiao ^{[1
]}

Xu, Dan ^{[3
]}

Tao, Zhichao ^{[2
]}

Hu, Caixia ^{[2
]}

Bai, Yiling ^{[2
]}

Zhao, Guoyan ^{[2
]}

Chen, Huimin ^{[4
]}

Cao, Jing-Pei ^{[1
]}

Yang, Yong ^{[2
]}

机构：

[1] China Univ Min & Technol, Jiangsu Prov Engn Res Ctr Fine Utilizat Carbon Re, Xuzhou 221116, Jiangsu, Peoples R China

[2] Synfuels China Co Ltd, Natl Energy Res Ctr Clean Fuels, Beijing 101400, Peoples R China

[3] Shandong Acad Sci, Energy Res Inst, Jinan 250014, Peoples R China

[4] Chem & Chem Engn Guangdong Lab, Shantou 515031, Peoples R China

来源：

FUEL | 2022年 / 320卷

关键词：

ZSM-5; Bronsted acid sites; Al distribution; Butenes; SOLID-STATE NMR; FAUJASITE-TYPE ZEOLITES; AB-INITIO; SKELETAL ISOMERIZATION; ALUMINUM-DEFICIENT; FRAMEWORK; LOCATION; STRENGTH; AROMATIZATION; CONFINEMENT;

D O I：

10.1016/j.fuel.2022.123729

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：

The relationship between Bronsted acid sites and framework Al distribution in the 10-membered ring (10-MR) straight and sinusoidal channels and their channel intersections in ZSM-5 zeolites were investigated using a range of analytical techniques. Spatial confinement in the straight and sinusoidal channels not only strengthens interactions between Bronsted acid sites and guest molecules, but also promotes proximity and interaction between Bronsted acid sites with the same chemical shift, enhancing their strengths. Stronger Bronsted acid sites do not benefit the conversion of butenes in oligomerization reactions owing to restriction of their migration and diffusion. However, the Al sites at channel intersections are more spacious, and the lower confinement therein favors selectivity for butene oligomerization products (C8) and n-butene aromatization products (BTX and C9 + aromatics).

引用

页数：10

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