Synthesis of spherical nano-ZSM-5 zeolite with intergranular mesoporous for alkylation of ethylbenzene with ethanol to produce m-diethylbenzene

doi:10.1016/j.cjche.2023.11.015

中国化学工程学报 ›› 2024, Vol. 67 ›› Issue (3): 298-309.DOI: 10.1016/j.cjche.2023.11.015

• • 上一篇

Synthesis of spherical nano-ZSM-5 zeolite with intergranular mesoporous for alkylation of ethylbenzene with ethanol to produce m-diethylbenzene

Siyue Wang¹, Jinhong Li¹, Qingxin Xu¹, Shengjie Song¹, Yu'ni Jiang¹, Lidong Chen¹, Xin Shi¹, Weiguo Cheng²

1 Faculty of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 110629, China;
2 Beijing Key Laboratory of Ionic Liquids Clean Process, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2023-08-26 修回日期:2023-11-03 出版日期:2024-03-28 发布日期:2024-06-01
通讯作者: Lidong Chen,E-mail address:lidongchhm0809@163.com;Xin Shi,E-mail address:shixin@lnnu.edu.cn;Weiguo Cheng,E-mail address:wgcheng@ipe.ac.cn.
基金资助:
Research support is from the Service Local Project of the Education Department of Liaoning Province (LJKMZ22021404, LF2019002 and LJKMZ22021423), and the “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences, (XDA 21030500).

Synthesis of spherical nano-ZSM-5 zeolite with intergranular mesoporous for alkylation of ethylbenzene with ethanol to produce m-diethylbenzene

Siyue Wang¹, Jinhong Li¹, Qingxin Xu¹, Shengjie Song¹, Yu'ni Jiang¹, Lidong Chen¹, Xin Shi¹, Weiguo Cheng²

1 Faculty of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 110629, China;
2 Beijing Key Laboratory of Ionic Liquids Clean Process, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2023-08-26 Revised:2023-11-03 Online:2024-03-28 Published:2024-06-01
Contact: Lidong Chen,E-mail address:lidongchhm0809@163.com;Xin Shi,E-mail address:shixin@lnnu.edu.cn;Weiguo Cheng,E-mail address:wgcheng@ipe.ac.cn.
Supported by:
Research support is from the Service Local Project of the Education Department of Liaoning Province (LJKMZ22021404, LF2019002 and LJKMZ22021423), and the “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences, (XDA 21030500).

摘要/Abstract

摘要： Catalytic synthesis of m-diethylbenzene (m-DEB) through alkylation of ethylbenzene (EB) may be a promising alternative route in comparison with traditional rectification of mixed DEB, for which the top priority is to develop efficient and stable heterogeneous catalysts. Here, the spherical nano-ZSM-5 zeolite with abundant intergranular mesoporous is synthesized by the seed-mediated growth method for alkylation of EB with ethanol to produce m-DEB. The results show that the spherical nano-ZSM-5 zeolite exhibits better stability and higher alkylation activity at a lower temperature than those of commercial micropore ZSM-5. And then, the spherical nano-ZSM-5 is further modified by La₂O₃ through acid treatment followed by immersion method. The acid treatment causes nano-ZSM-5 to exhibit the increased pore size but decreased the acid sites, and subsequent La₂O₃ loading reintroduces the weak acid sites. As a result, the HNO₃eLa₂O₃-modified catalyst exhibits a slight increase in EB conversion and DEB yield in comparison with unmodified one, and meanwhile, it still maintains high m-DEB selectivity. The catalyst after acid treatment achieves higher catalytic stability besides maintaining the high alkylation activity of EB with ethanol. The present study on the spherical nano-HZSM-5 zeolite and its modification catalyst with excellent alkylation ability provides new insights into the production of m-DEB.

关键词: Zeolite, Modification, Alkylation reaction, m-diethylbenzene, Catalyst, Fixed-bed

Abstract: Catalytic synthesis of m-diethylbenzene (m-DEB) through alkylation of ethylbenzene (EB) may be a promising alternative route in comparison with traditional rectification of mixed DEB, for which the top priority is to develop efficient and stable heterogeneous catalysts. Here, the spherical nano-ZSM-5 zeolite with abundant intergranular mesoporous is synthesized by the seed-mediated growth method for alkylation of EB with ethanol to produce m-DEB. The results show that the spherical nano-ZSM-5 zeolite exhibits better stability and higher alkylation activity at a lower temperature than those of commercial micropore ZSM-5. And then, the spherical nano-ZSM-5 is further modified by La₂O₃ through acid treatment followed by immersion method. The acid treatment causes nano-ZSM-5 to exhibit the increased pore size but decreased the acid sites, and subsequent La₂O₃ loading reintroduces the weak acid sites. As a result, the HNO₃eLa₂O₃-modified catalyst exhibits a slight increase in EB conversion and DEB yield in comparison with unmodified one, and meanwhile, it still maintains high m-DEB selectivity. The catalyst after acid treatment achieves higher catalytic stability besides maintaining the high alkylation activity of EB with ethanol. The present study on the spherical nano-HZSM-5 zeolite and its modification catalyst with excellent alkylation ability provides new insights into the production of m-DEB.

Key words: Zeolite, Modification, Alkylation reaction, m-diethylbenzene, Catalyst, Fixed-bed

Siyue Wang, Jinhong Li, Qingxin Xu, Shengjie Song, Yu'ni Jiang, Lidong Chen, Xin Shi, Weiguo Cheng. Synthesis of spherical nano-ZSM-5 zeolite with intergranular mesoporous for alkylation of ethylbenzene with ethanol to produce m-diethylbenzene[J]. 中国化学工程学报, 2024, 67(3): 298-309.

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Synthesis of spherical nano-ZSM-5 zeolite with intergranular mesoporous for alkylation of ethylbenzene with ethanol to produce m-diethylbenzene

Synthesis of spherical nano-ZSM-5 zeolite with intergranular mesoporous for alkylation of ethylbenzene with ethanol to produce m-diethylbenzene

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