HZSM-5 zeolites undergoing the high-temperature process for boosting the bimolecular reaction in n-heptane catalytic cracking

被引：5

作者：

Song, Chenggong ^{[1
]}

Ma, Zhenzhou ^{[1
]}

Hou, Xu ^{[1
]}

Zhou, Hao ^{[1
]}

Qiao, Huimin ^{[1
]}

Tian, Changchang ^{[1
]}

Yin, Li ^{[1
]}

Jin, Baitang ^{[2
]}

Yuan, Enxian ^{[3
]}

机构：

[1] Changchun Univ Technol, Sch Chem Engn, Changchun 13002, Peoples R China

[2] North Carolina State Univ, Dept Chem & Biomol Engn, Raleigh, NC 27606 USA

[3] Yangzhou Univ, Sch Chem & Chem Engn, Yangzhou 225009, Peoples R China

来源：

CHINESE JOURNAL OF CHEMICAL ENGINEERING | 2024年 / 66卷

基金：

中国国家自然科学基金;

关键词：

HZSM-5; n-Heptane; Catalytic cracking; High-temperature treatment; Extra-framework Al; BRONSTED ACID SITES; EXTRAFRAMEWORK ALUMINUM; LIGHT OLEFINS; PERFORMANCE; CALCINATION; ZSM-5; HYDROCARBONS; CONVERSION;

D O I：

10.1016/j.cjche.2023.10.004

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

High -temperature treatment is key to the preparation of zeolite catalysts. Herein, the effects of hightemperature treatment on the property and performance of HZSM-5 zeolites were studied in this work. X -Ray diffraction, N2 physisorption, 27Al magic angle spinning nuclear magnetic resonance (MAS NMR), and temperature -programmed desorption of ammonia results indicated that the hightemperature treatment at 650 degrees C hardly affected the inherent crystal and texture of HZSM-5 zeolites but facilitated the conversion of framework Al to extra -framework Al, reducing the acid site and enhancing the acid strength. Moreover, the high -temperature treatment improved the performance of HZSM-5 zeolites in n-heptane catalytic cracking, promoting the conversion and light olefins yield while inhibiting coke formation. Based on the kinetic and mechanism analysis, the improvement of HZSM-5 performance caused by high -temperature treatment has been attributed to the formation of extra -framework Al, which enhanced the acid strength, facilitated the bimolecular reaction, and promoted the entropy change to overcome a higher energy barrier in n-heptane catalytic cracking. (c) 2023 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.

引用

页码：136 / 144

页数：9

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