文献类型：期刊文献

英文题名：Characteristics of Pore Structure Evolution of Spent Fcc Catalyst and its Effect Mechanism on Regeneration at Different Atmospheres

作者：Zhang, Haigang[1]; Shen, Zhongjie[1]; Gong, Jianhong[2]; Xu, Jianliang[1]; Liu, Haifeng[1]

机构：[1] Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, P. O. Box 272, Shanghai, 200237, China; [2] Sinopec Research Institute of Petroleum Processing, Beijing, 100083, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220161240)

语种：英文

外文关键词：Coke - Combustion - Deposits - Kaolinite - Silica

摘要：Spent catalyst regeneration is key to the removal of coke deposit in the fluid catalytic cracking (FCC). This current study focuses on the evolution of pore structure of catalyst particle and its effect mechanism on the regeneration at different atmospheres. The results show that regenerated catalyst particles still contain coke deposit inside after combustion. The combustion caused high-temperature particle surface to further transform to catalyst matrix structure. From the analysis of x-Ray diffraction, the kaolinite phase in the matrix is changed to silica-aluminum spinel crystals, which tends to collapse and block small pores or expand large pores. Nevertheless, the micro porosity in the O 2 /CO 2 atmosphere after regeneration is increased by 32.4% and the total acid volume rises to 27.1%, compared to regenerated in air. The coexistence of gasification and partial oxidation can promote the regeneration of the spent catalyst and maintain the original structure. ? 2022, The Authors. All rights reserved.