Shape-selective alkylation of benzene with ethylene over a core-shell ZSM-5@MCM-41 composite material

doi:10.1016/j.cjche.2021.05.030

Chinese Journal of Chemical Engineering ›› 2021, Vol. 37 ›› Issue (9): 64-71.DOI: 10.1016/j.cjche.2021.05.030

• Catalysis, Kinetics and Reaction Engineering • Previous Articles Next Articles

Shape-selective alkylation of benzene with ethylene over a core-shell ZSM-5@MCM-41 composite material

Zhenhao Shen^1,2, Chongwei Ma^2,3, Darui Wang², Junlin He², Hongmin Sun², Zhirong Zhu¹, Weimin Yang^2,3

1. Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China;
2. Shanghai Research Institute of Petrochemical Technology, Sinopec, Shanghai 201208, China;
3. School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2020-10-13 Revised:2020-12-13 Online:2021-11-02 Published:2021-09-28
Contact: Zhirong Zhu, Weimin Yang
Supported by:
The authors wish to acknowledge the financial support by the National Natural Science Foundation of China (91534115) and the National Key Research and Development Project (2016YFC1102300).

Shape-selective alkylation of benzene with ethylene over a core-shell ZSM-5@MCM-41 composite material

Zhenhao Shen^1,2, Chongwei Ma^2,3, Darui Wang², Junlin He², Hongmin Sun², Zhirong Zhu¹, Weimin Yang^2,3

1. Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China;
2. Shanghai Research Institute of Petrochemical Technology, Sinopec, Shanghai 201208, China;
3. School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

通讯作者: Zhirong Zhu, Weimin Yang
基金资助:
The authors wish to acknowledge the financial support by the National Natural Science Foundation of China (91534115) and the National Key Research and Development Project (2016YFC1102300).

Abstract

Abstract: A series of ZSM-5@MCM-41 core-shell composite materials prepared via a multi-cycle-sol-gel coating strategy is investigated as the catalyst for benzene alkylation with ethylene, in which both ethylbenzene and para-diethylbenzene (p-DEB) are aimed as the target products. With multi-cycle-sol-gel coating, the external acid sites on the samples are gradually passivated by the inert MCM-41 shell. As a result, the shape selectivity to p-DEB is greatly enhanced. Nevertheless, the coating of mesoporous MCM-41 shell on ZSM-5 accelerates deactivation of the catalyst only due to the dilution effect of ZSM-5 content in the catalyst at the same space velocity, which is a reason that core-shell ZSM-5@MCM-41 will potentially be a practical catalyst in shape selective alkylation of benzene. In order to enhance the yield of p-DEB on ZSM-5@MCM-41, the reaction conditions at the fixed bed reactor including temperature, the molar rate of benzene to ethylene and GHSV, are also optimized.

Key words: Core-shell ZSM-5@MCM-41, Coating, Ethylbenzene, Para-diethylbenzene, Shape selectivity, Deactivation

摘要： A series of ZSM-5@MCM-41 core-shell composite materials prepared via a multi-cycle-sol-gel coating strategy is investigated as the catalyst for benzene alkylation with ethylene, in which both ethylbenzene and para-diethylbenzene (p-DEB) are aimed as the target products. With multi-cycle-sol-gel coating, the external acid sites on the samples are gradually passivated by the inert MCM-41 shell. As a result, the shape selectivity to p-DEB is greatly enhanced. Nevertheless, the coating of mesoporous MCM-41 shell on ZSM-5 accelerates deactivation of the catalyst only due to the dilution effect of ZSM-5 content in the catalyst at the same space velocity, which is a reason that core-shell ZSM-5@MCM-41 will potentially be a practical catalyst in shape selective alkylation of benzene. In order to enhance the yield of p-DEB on ZSM-5@MCM-41, the reaction conditions at the fixed bed reactor including temperature, the molar rate of benzene to ethylene and GHSV, are also optimized.

关键词: Core-shell ZSM-5@MCM-41, Coating, Ethylbenzene, Para-diethylbenzene, Shape selectivity, Deactivation

Zhenhao Shen, Chongwei Ma, Darui Wang, Junlin He, Hongmin Sun, Zhirong Zhu, Weimin Yang. Shape-selective alkylation of benzene with ethylene over a core-shell ZSM-5@MCM-41 composite material[J]. Chinese Journal of Chemical Engineering, 2021, 37(9): 64-71.

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Shape-selective alkylation of benzene with ethylene over a core-shell ZSM-5@MCM-41 composite material

Shape-selective alkylation of benzene with ethylene over a core-shell ZSM-5@MCM-41 composite material

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