Pore plugging effects on the performance of ZSM-5 catalyst in MTP reaction using a discrete model

• Published in: Chinese journal of chemical engineering Vol. 32; no. 4; pp. 253 - 263
• Main Authors: Shen, Yudong, Liang, Hao, Liao, Zuwei, Jiang, Binbo, Wang, Jingdai, Yang, Yongrong, Li, Minggang, Luo, Yibin, Shu, Xingtian
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2021; Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China%State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China%SINOPEC Research Institute of Petroleum Processing,Beijing 100083,China
• Subjects: Discrete model; MTP reaction; Pore network; Pore plugging effects; Pore network; Discrete model; Pore plugging effects; MTP reaction
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/j.cjche.2020.10.038

Coke is an important medium for connecting reaction and regeneration of the methanol to propylene process on the ZSM-5 catalyst. Coke grows in the meso and macro pores, it gradually worsens the diffusion inside the catalyst particle. Furthermore, pore plugging is inevitable which causes the deactivation of ZSM-5 catalyst. However, current continuum model cannot reflect the changes in pore structure with clear physical concepts. A discrete model that is verified by the carbon deposition experiments is introduced to indicate the behavior of pore plugging effects. Results show that the pore plugging has a significant effect on the performance of the catalyst. The time varying profile of effectiveness factor is obtained, indicating a regular reduction with the increase of the pore plugging effect. Spatial distributions of pore size that would significantly enhance the plugging effect are also identified.