文献类型：期刊文献

中文题名：Optimization of catalyst pellet structures and operation conditions for CO methanation

作者：Yiquan Zhao[1];Yao Shi[1];Guanghua Ye[1];Jing Zhang[1];Xuezhi Duan[1];Gang Qian[1];Xinggui Zhou[1]

机构：[1]State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China

年份：2021

卷号：34

期号：12

起止页码：106

中文期刊名：Chinese Journal of Chemical Engineering

外文期刊名：中国化学工程学报（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2021_2022】；PubMed;

基金：supported by the National Key Research and Development Program of China (2018YFB0604500);the National Natural Science Foundation of China (21922803)。

语种：英文

中文关键词：CO methanation;Numerical simulation;Catalyst pellet;Shape effects;Reaction-diffusion behavior

摘要：A fundamental understanding of the effects of catalyst pellet structures and operation conditions on catalytic performance is crucial for the reactions limited by diffusion mass transfer. In this work, a numerical investigation has been carried out to understand the effect of catalyst pellet shapes(sphere, cylinder, trilobe and tetralobe) on the reaction-diffusion behaviors of CO methanation. The results reveal that the poly-lobe pellets with larger external specific surface area have shorter diffusion path, and thus result in higher effectiveness factors and CO conversion rates in comparison with the spherical and cylindrical pellets. The effects of operating conditions and pore structures on the trilobular catalyst pellet with high performance are further probed. Though lower temperature can contribute to larger effectiveness factors of pellets, it also brings about lower reaction rates, and pressure has little impact on the effectiveness factors of the pellets. The increase in porosity can reduce the pellet internal diffusion limitations effectively and there exists an optimal porosity for the methanation reaction. Finally, the height of the trilobular pellet is optimized under the given geometric volume, and the results demonstrate that the higher the trilobular catalyst, the better the reaction performance within the allowable mechanical strength range.