SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 55 ›› Issue (3): 165-172.DOI: 10.1016/j.cjche.2022.04.017

• Full Length Article • 上一篇    下一篇

Experiment and modeling of coke formation and catalyst deactivation in n-heptane catalytic cracking over HZSM-5 zeolites

Zhenzhou Ma1, Xu Hou1,2, Bochong Chen1, Liu Zhao1, Enxian Yuan3, Tingting Cui4   

  1. 1. School of Chemical Engineering, Changchun University of Technology, Changchun 130012, China;
    2. Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China;
    3. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China;
    4. Department of Chemistry, Tsinghua University, Beijing 100084, China
  • 收稿日期:2021-12-20 修回日期:2022-04-21 出版日期:2023-03-28 发布日期:2023-06-03
  • 通讯作者: Xu Hou,E-mail:houx@ccut.edu.cn;Enxian Yuan,E-mail:exyuan@yzu.edu.cn;Tingting Cui,E-mail:ttcui@mail.tsinghua.edu.cn
  • 基金资助:
    The authors gratefully acknowledge for the financial support from the National Natural Science Foundation of China (21908010) and the Education Department of Jilin Province (JJKH20220694KJ).

Experiment and modeling of coke formation and catalyst deactivation in n-heptane catalytic cracking over HZSM-5 zeolites

Zhenzhou Ma1, Xu Hou1,2, Bochong Chen1, Liu Zhao1, Enxian Yuan3, Tingting Cui4   

  1. 1. School of Chemical Engineering, Changchun University of Technology, Changchun 130012, China;
    2. Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China;
    3. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China;
    4. Department of Chemistry, Tsinghua University, Beijing 100084, China
  • Received:2021-12-20 Revised:2022-04-21 Online:2023-03-28 Published:2023-06-03
  • Contact: Xu Hou,E-mail:houx@ccut.edu.cn;Enxian Yuan,E-mail:exyuan@yzu.edu.cn;Tingting Cui,E-mail:ttcui@mail.tsinghua.edu.cn
  • Supported by:
    The authors gratefully acknowledge for the financial support from the National Natural Science Foundation of China (21908010) and the Education Department of Jilin Province (JJKH20220694KJ).

摘要: Since paraffins catalytic cracking was of significant importance to light olefins and aromatics production, this work was intended to gain insights into the feature and model of coke formation and catalyst deactivation in n-heptane catalytic cracking over HZSM-5 zeolites. 18 tests of n-heptane catalytic cracking were designed and carried out over HZSM-5 zeolites in a wide range of operating conditions. A particular attention was paid to the measurement of the conversion, product distribution, coke content, and the porosity and acidity of the fresh and spent HZSM-5 zeolites. It was found that alkene and aromatic promoted coke formation, and it reduced the pore volume and acid site of HZSM-5 zeolites, tailoring its performance in n-heptane catalytic cracking. The specific relationship between HZSM-5 zeolites, n-heptane conversion, product distribution and coke formation was quantitively characterized by the exponential and linear function. Based on the reaction network, the coupled scheme of coke formation and catalyst deactivation were specified for n-heptane catalytic cracking. The dual-model was proposed for the process simulation of n-heptane catalytic cracking over HZSM-5 zeolites. It predicted not only the conversion and product distribution but also coke content with the acceptable errors.

关键词: n-Heptane, HZSM-5, Catalytic cracking, Coke, Deactivation, Dual-model

Abstract: Since paraffins catalytic cracking was of significant importance to light olefins and aromatics production, this work was intended to gain insights into the feature and model of coke formation and catalyst deactivation in n-heptane catalytic cracking over HZSM-5 zeolites. 18 tests of n-heptane catalytic cracking were designed and carried out over HZSM-5 zeolites in a wide range of operating conditions. A particular attention was paid to the measurement of the conversion, product distribution, coke content, and the porosity and acidity of the fresh and spent HZSM-5 zeolites. It was found that alkene and aromatic promoted coke formation, and it reduced the pore volume and acid site of HZSM-5 zeolites, tailoring its performance in n-heptane catalytic cracking. The specific relationship between HZSM-5 zeolites, n-heptane conversion, product distribution and coke formation was quantitively characterized by the exponential and linear function. Based on the reaction network, the coupled scheme of coke formation and catalyst deactivation were specified for n-heptane catalytic cracking. The dual-model was proposed for the process simulation of n-heptane catalytic cracking over HZSM-5 zeolites. It predicted not only the conversion and product distribution but also coke content with the acceptable errors.

Key words: n-Heptane, HZSM-5, Catalytic cracking, Coke, Deactivation, Dual-model