文献类型：期刊文献

英文题名：Pore network modeling of catalyst deactivation by coking, from single site to particle, during propane dehydrogenation

作者：Ye, Guanghua[1];Wang, Haizhi[1];Duan, Xuezhi[1];Sui, Zhijun[1];Zhou, Xinggui[1];Coppens, Marc-Olivier[2];Yuan, Weikang[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]UCL, Dept Chem Engn, London WC1E 7JE, England

年份：2019

卷号：65

期号：1

起止页码：140

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20184305976339);WOS:【SCI-EXPANDED(收录号:WOS:000454632100014)】；

基金：This work was supported by the National Natural Science Foundation of China (21706067 and U1663221), the China Postdoctoral Science Foundation (2016M600289 and 2018T110358), and the Fundamental Research Funds for the Central Universities (222201714004 and 222201718003). M.O. C. is supported by the EPSRC "Frontier Engineering" Centre for Nature Inspired Engineering (EP/K038656/1) and the UK Catalysis Hub (EP/K014706/1).

语种：英文

外文关键词：propane dehydrogenation; deactivation by coking; pore network model; pore blockage; catalyst design

摘要：A versatile pore network model is used to study deactivation by coking in a single catalyst particle. This approach allows to gain detailed insights into the progression of deactivation from active site, to pore, and to particle-providing valuable information for catalyst design. The model is applied to investigate deactivation by coking during propane dehydrogenation in a Pt-Sn/Al2O3 catalyst particle. We find that the deactivation process can be separated into two stages when there exist severe diffusion limitation and pore blockage, and the toxicity of coke formed in the later stage is much stronger than of coke formed in the early stage. The reaction temperature and composition change the coking rate and apparent reaction rate, informed by the kinetics, but, remarkably, they do not change the capacity for a catalyst particle to accommodate coke. Conversely, the pore network structure significantly affects the capacity to contain coke. (c) 2018 The Authors. AIChE Journal published by Wiley Periodicals, Inc. on behalf of American Institute of Chemical Engineers. AIChE J, 65: 140-150, 2019