Effect of particle size of single-crystalline hierarchical ZSM-5 on its surface mass transfer in n-heptane catalytic cracking

doi:10.1016/j.cjche.2023.04.024

中国化学工程学报 ›› 2023, Vol. 63 ›› Issue (11): 148-157.DOI: 10.1016/j.cjche.2023.04.024

• Full Length Article • 上一篇下一篇

Effect of particle size of single-crystalline hierarchical ZSM-5 on its surface mass transfer in n-heptane catalytic cracking

Xiaoxue Zhang¹, Shuman Xu¹, Jing Hao¹, Xiaojin Xie¹, Fengqiu Chen^1,2, Dangguo Cheng^1,2

1. College of Chemical and Biological Engineering, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Zhejiang University, Hangzhou 310027, China;
2. Institute of Zhejiang University-Quzhou, Quzhou 324000, China

收稿日期:2023-02-02 修回日期:2023-04-14 出版日期:2023-11-28 发布日期:2024-01-08
通讯作者: Dangguo Cheng,E-mail:dgcheng@zju.edu.cn
基金资助:
The support from the National Natural Science Foundation of China (22278353) is greatly appreciated.

Effect of particle size of single-crystalline hierarchical ZSM-5 on its surface mass transfer in n-heptane catalytic cracking

Xiaoxue Zhang¹, Shuman Xu¹, Jing Hao¹, Xiaojin Xie¹, Fengqiu Chen^1,2, Dangguo Cheng^1,2

1. College of Chemical and Biological Engineering, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Zhejiang University, Hangzhou 310027, China;
2. Institute of Zhejiang University-Quzhou, Quzhou 324000, China

Received:2023-02-02 Revised:2023-04-14 Online:2023-11-28 Published:2024-01-08
Contact: Dangguo Cheng,E-mail:dgcheng@zju.edu.cn
Supported by:
The support from the National Natural Science Foundation of China (22278353) is greatly appreciated.

摘要/Abstract

摘要： Single-crystalline hierarchical ZSM-5 zeolites with different particle sizes (namely 100, 140, and 200 nm) were successfully prepared by adjusting the amount of tetrapropylammonium hydroxide (TPAOH), and investigated in n-heptane catalytic cracking reaction. Diffusional measurements by zero-length column (ZLC) method showed that the apparent diffusivities of n-heptane decreased with the reduction of particle size, indicating the existence of surface barriers. Moreover, with the decrease of particle size, the additional diffusion path length increased, which meant the influence of surface barriers became more apparent. Despite the change of surface barriers, the intracrystalline diffusion still dominated the overall diffusion. Catalytic performance showed that the zeolite with smaller particle size had better stability.

关键词: Single-crystalline, Hierarchical ZSM-5, Particle size, Surface barriers, n-Heptane catalytic cracking

Abstract: Single-crystalline hierarchical ZSM-5 zeolites with different particle sizes (namely 100, 140, and 200 nm) were successfully prepared by adjusting the amount of tetrapropylammonium hydroxide (TPAOH), and investigated in n-heptane catalytic cracking reaction. Diffusional measurements by zero-length column (ZLC) method showed that the apparent diffusivities of n-heptane decreased with the reduction of particle size, indicating the existence of surface barriers. Moreover, with the decrease of particle size, the additional diffusion path length increased, which meant the influence of surface barriers became more apparent. Despite the change of surface barriers, the intracrystalline diffusion still dominated the overall diffusion. Catalytic performance showed that the zeolite with smaller particle size had better stability.

Key words: Single-crystalline, Hierarchical ZSM-5, Particle size, Surface barriers, n-Heptane catalytic cracking

Xiaoxue Zhang, Shuman Xu, Jing Hao, Xiaojin Xie, Fengqiu Chen, Dangguo Cheng. Effect of particle size of single-crystalline hierarchical ZSM-5 on its surface mass transfer in n-heptane catalytic cracking[J]. 中国化学工程学报, 2023, 63(11): 148-157.

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Effect of particle size of single-crystalline hierarchical ZSM-5 on its surface mass transfer in n-heptane catalytic cracking

Effect of particle size of single-crystalline hierarchical ZSM-5 on its surface mass transfer in n-heptane catalytic cracking

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