摘要：Pore network is regarded as one of the most important aspects of FCC (Fluid Catalytic Cracking) catalysts for delivering reactants to active sites and transporting out products, and the structure of which can significantly influence the process efficiency. In this work, six characterization methods complementing each other were employed to study the full-scale pore structure (0.4 nm 20 mu m) of fresh FCC particles, especially the X-ray computed tomography (CT) and focused ion beam-scanning electron microscope (FIB-SEM). To focus on nano scale pores, 3D reconstruction of a whole FCC particle was achieved based on nano-CT, from which the pore network model (PNM) was successfully extracted. Then, permeability simulations along different directions and through various sub-volumes were carried out to demonstrate the anisotropy and heterogeneity of pore structure, respectively. It was also found that the tortuosity of the pores distributed in the outer layer of the FCC particle was more significant than that in the central part of the particle, which could be the mass transfer limiting region during catalysis. Comprehensive acknowledgment of pore structure provides guidance for the optimization of the design of FCC particles, and the multi-scale characterization strategy is a generic strategy for in-depth investigation of structured porous materials.

关键字：Fluid catalytic cracking (FCC); X-ray computed tomography (CT); Focused ion beam-scanning electron micro-; scope (FIB-SEM); Pore size distribution; Permeability; Heterogeneity

ISSN号：1385-8947

卷、期、页：卷: 440

发表日期：2022-07-15

影响因子：13.272900

期刊分区（SCI为中科院分区）：一区

收录情况：SCIE（科学引文索引网络版）

发表期刊名称：CHEMICAL ENGINEERING JOURNAL

参与作者：Qie, Zhipeng,Rabbani, Arash,Liang, Yan,Sun, Fei,Behnsen, Julia,Wang, Ying,Wang, Shaogang,Alhassawi, Hassan,Gao, Jihui,Zhao, Guangbo,Babaei, Masoud,Garforth, Arthur A.,Jiao, Yilai,Fan, Xiaolei

第一作者：张玉明

论文类型：期刊论文

论文概要：Qie, Zhipeng,Rabbani, Arash,Liang, Yan,Sun, Fei,Behnsen, Julia,Wang, Ying,Wang, Shaogang,张玉明,Alhassawi, Hassan,Gao, Jihui,Zhao, Guangbo,Babaei, Masoud,Garforth, Arthur A.,Jiao, Yilai,Fan, Xiaolei，Multiscale investigation of pore network heterogeneity and permeability of fluid catalytic cracking (FCC) particles，CHEMICAL ENGINEERING JOURNAL，2022，卷: 440

论文题目：Multiscale investigation of pore network heterogeneity and permeability of fluid catalytic cracking (FCC) particles