Influences of regeneration atmospheres on structural transformation and renderability of fluidized catalytic cracking catalyst

doi:10.1016/j.cjche.2023.04.020

中国化学工程学报 ›› 2023, Vol. 63 ›› Issue (11): 71-80.DOI: 10.1016/j.cjche.2023.04.020

• Full Length Article • 上一篇下一篇

Influences of regeneration atmospheres on structural transformation and renderability of fluidized catalytic cracking catalyst

Haigang Zhang¹, Zhongjie Shen¹, Jianhong Gong², Haifeng Liu¹

1. National Energy Coal Gasification Technology Research and Development Center and Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai 200237, China;
2. Sinopec Research Institute of Petroleum Processing, Beijing 100083, China

收稿日期:2023-01-10 修回日期:2023-04-17 出版日期:2023-11-28 发布日期:2024-01-08
通讯作者: Zhongjie Shen,E-mail:zjshen@ecust.edu.cn
基金资助:
This study is supported by the National Natural Science Foundation of China (21908063), the Shanghai Pujiang Program (21PJ1402300), the Fundamental Research Funds of the Central Universities (JKB01211715 and JKB01221677).

Influences of regeneration atmospheres on structural transformation and renderability of fluidized catalytic cracking catalyst

Haigang Zhang¹, Zhongjie Shen¹, Jianhong Gong², Haifeng Liu¹

1. National Energy Coal Gasification Technology Research and Development Center and Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai 200237, China;
2. Sinopec Research Institute of Petroleum Processing, Beijing 100083, China

Received:2023-01-10 Revised:2023-04-17 Online:2023-11-28 Published:2024-01-08
Contact: Zhongjie Shen,E-mail:zjshen@ecust.edu.cn
Supported by:
This study is supported by the National Natural Science Foundation of China (21908063), the Shanghai Pujiang Program (21PJ1402300), the Fundamental Research Funds of the Central Universities (JKB01211715 and JKB01221677).

摘要/Abstract

摘要： The regeneration of fluidized catalytic cracking (FCC) catalysts is an essential process in petroleum processing. The current study focused the regeneration reaction characteristics of spent fluidized catalytic cracking catalyst (SFCC) at different atmospheres with influences on pore evolution and activity, for a potential way to reduce emission, produce moderate chemical product (CO), and maintain catalyst activity. The results show that regeneration in air indicates a satisfaction on removing coke on the catalyst surface while giving a poor effect on eliminating the coke inside micropores. This is attributed that the combustion in air led to a higher temperature and further transformed kaolinite phase to silica-aluminum spinel crystals, which tended to collapse and block small pores or expand large pores, with similar results observed in pure O₂ atmosphere. Nevertheless, catalysts regenerated in O₂/CO₂ diminished the combustion damage to the pore structure, of which the micro porosity after regeneration increased by 32.4% and the total acid volume rose to 27.1%. The regeneration in pure CO₂ displayed low conversion rate due to the endothermic reaction and low reactivity. The coexistence of gasification and partial oxidation can promote regeneration and maintain the original structure and good reactivity. Finally, a mechanism of the regeneration reaction at different atmospheres was revealed.

关键词: Fluidized catalytic cracking, Coke deposit, Regeneration, Pore structure, Gasification and combustion

Abstract: The regeneration of fluidized catalytic cracking (FCC) catalysts is an essential process in petroleum processing. The current study focused the regeneration reaction characteristics of spent fluidized catalytic cracking catalyst (SFCC) at different atmospheres with influences on pore evolution and activity, for a potential way to reduce emission, produce moderate chemical product (CO), and maintain catalyst activity. The results show that regeneration in air indicates a satisfaction on removing coke on the catalyst surface while giving a poor effect on eliminating the coke inside micropores. This is attributed that the combustion in air led to a higher temperature and further transformed kaolinite phase to silica-aluminum spinel crystals, which tended to collapse and block small pores or expand large pores, with similar results observed in pure O₂ atmosphere. Nevertheless, catalysts regenerated in O₂/CO₂ diminished the combustion damage to the pore structure, of which the micro porosity after regeneration increased by 32.4% and the total acid volume rose to 27.1%. The regeneration in pure CO₂ displayed low conversion rate due to the endothermic reaction and low reactivity. The coexistence of gasification and partial oxidation can promote regeneration and maintain the original structure and good reactivity. Finally, a mechanism of the regeneration reaction at different atmospheres was revealed.

Key words: Fluidized catalytic cracking, Coke deposit, Regeneration, Pore structure, Gasification and combustion

Haigang Zhang, Zhongjie Shen, Jianhong Gong, Haifeng Liu. Influences of regeneration atmospheres on structural transformation and renderability of fluidized catalytic cracking catalyst[J]. 中国化学工程学报, 2023, 63(11): 71-80.

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Influences of regeneration atmospheres on structural transformation and renderability of fluidized catalytic cracking catalyst

Influences of regeneration atmospheres on structural transformation and renderability of fluidized catalytic cracking catalyst

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