SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 56 ›› Issue (4): 314-324.DOI: 10.1016/j.cjche.2022.06.013

• Full Length Article • 上一篇    

Enhancement of catalytic and anti-carbon deposition performance of SAPO-34/ZSM-5/quartz films in MTA reaction by Si/Al ratio regulation

Jiaxin Wu1, Chenxiao Wang1, Xianliang Meng1,2, Haichen Liu1,2, Ruizhi Chu1,2, Guoguang Wu1,2, Weisong Li1,2, Xiaofeng Jiang1,2, Deguang Yang1   

  1. 1. School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China;
    2. Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, Xuzhou 221116, China
  • 收稿日期:2022-04-18 修回日期:2022-06-18 出版日期:2023-04-28 发布日期:2023-06-13
  • 通讯作者: Xianliang Meng,E-mail:meng27@cumt.edu.cn;Haichen Liu,E-mail:4037@cumt.edu.cn
  • 基金资助:
    This work is supported by the National Natural Science Foundation of China (51974312, 51974308), and the National Key Research & Development Program of China (2019YFE0100100).

Enhancement of catalytic and anti-carbon deposition performance of SAPO-34/ZSM-5/quartz films in MTA reaction by Si/Al ratio regulation

Jiaxin Wu1, Chenxiao Wang1, Xianliang Meng1,2, Haichen Liu1,2, Ruizhi Chu1,2, Guoguang Wu1,2, Weisong Li1,2, Xiaofeng Jiang1,2, Deguang Yang1   

  1. 1. School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China;
    2. Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, Xuzhou 221116, China
  • Received:2022-04-18 Revised:2022-06-18 Online:2023-04-28 Published:2023-06-13
  • Contact: Xianliang Meng,E-mail:meng27@cumt.edu.cn;Haichen Liu,E-mail:4037@cumt.edu.cn
  • Supported by:
    This work is supported by the National Natural Science Foundation of China (51974312, 51974308), and the National Key Research & Development Program of China (2019YFE0100100).

摘要: In order to further improve the catalytic performance of zeolite catalyst for methanol to aromatics (MTA) technology, the double-tier SAPO-34/ZSM-5/quartz composite zeolite films were successfully synthesized via hydrothermal crystallization. The Si/Al ratio of SAPO-34 film was used as the only variable to study this material. The composite zeolite material with 0.6Si/Al ratio of SAPO-34 has the largest mesoporous specific surface area and the most suitable acid distribution. The catalytic performance for the MTA process showed that 0.6-SAPO-34/ZSM-5/quartz film has as high as 50.3% benzene-toluene-xylene selectivity and 670 min lifetime. The MTA reaction is carried out through the path we designed to effectively avoid the hydrocarbon pool circulation of ZSM-5 zeolite, so as to improve the aromatics selectivity and inhibit the occurrence of deep side reactions to a great extent. The coke deposition behavior was monitored by thermogravimetric analysis and gas chromatograph/mass spectrometer, it is found that with the increase of Si/Al ratio, the active intermediates changed from low-substituted methylbenzene to high-substituted methylbenzene, which led to the rapid deactivation of the catalyst. This work provides a possibility to employ the synergy effect of composite zeolite film synthesizing anti-carbon deposition catalyst in MTA reaction.

关键词: Composite zeolite film, Methanol to aromatics, Anti-carbon deposition, Si/Al ratio, Hydrocarbon pool circulation mechanism

Abstract: In order to further improve the catalytic performance of zeolite catalyst for methanol to aromatics (MTA) technology, the double-tier SAPO-34/ZSM-5/quartz composite zeolite films were successfully synthesized via hydrothermal crystallization. The Si/Al ratio of SAPO-34 film was used as the only variable to study this material. The composite zeolite material with 0.6Si/Al ratio of SAPO-34 has the largest mesoporous specific surface area and the most suitable acid distribution. The catalytic performance for the MTA process showed that 0.6-SAPO-34/ZSM-5/quartz film has as high as 50.3% benzene-toluene-xylene selectivity and 670 min lifetime. The MTA reaction is carried out through the path we designed to effectively avoid the hydrocarbon pool circulation of ZSM-5 zeolite, so as to improve the aromatics selectivity and inhibit the occurrence of deep side reactions to a great extent. The coke deposition behavior was monitored by thermogravimetric analysis and gas chromatograph/mass spectrometer, it is found that with the increase of Si/Al ratio, the active intermediates changed from low-substituted methylbenzene to high-substituted methylbenzene, which led to the rapid deactivation of the catalyst. This work provides a possibility to employ the synergy effect of composite zeolite film synthesizing anti-carbon deposition catalyst in MTA reaction.

Key words: Composite zeolite film, Methanol to aromatics, Anti-carbon deposition, Si/Al ratio, Hydrocarbon pool circulation mechanism