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

doi:10.1016/j.cjche.2022.04.017

Chinese Journal of Chemical Engineering ›› 2023, Vol. 55 ›› Issue (3): 165-172.DOI: 10.1016/j.cjche.2022.04.017

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

Zhenzhou Ma¹, Xu Hou^1,2, Bochong Chen¹, Liu Zhao¹, Enxian Yuan³, Tingting Cui⁴

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:2023-06-03 Published:2023-03-28
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).

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

Zhenzhou Ma¹, Xu Hou^1,2, Bochong Chen¹, Liu Zhao¹, Enxian Yuan³, Tingting Cui⁴

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

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).

Abstract

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

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

Zhenzhou Ma, Xu Hou, Bochong Chen, Liu Zhao, Enxian Yuan, Tingting Cui. Experiment and modeling of coke formation and catalyst deactivation in n-heptane catalytic cracking over HZSM-5 zeolites[J]. Chinese Journal of Chemical Engineering, 2023, 55(3): 165-172.

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

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

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