化工学报2025，Vol.76Issue(2)：654-666,13.DOI:10.11949/0438-1157.20240266
Ag/SiO2催化草酸酯加氢制乙醇酸甲酯的床层-颗粒双尺度耦合模拟研究
Bed-particle dual scale coupled simulation on Ag/SiO2 catalyzed hydrogenation of oxalate to methyl glycolate
摘要
Abstract
The selective hydrogenation of dimethyl oxalate(DMO)to methyl glycolate(MG)involves serial hydrogenation reactions,where transport phenomena within the catalyst pellets and throughout the catalyst bed play a pivotal role in determining catalytic performance.Hence,meticulous structural design of pellet catalysts is imperative for their industrial viability.In this study,the kinetic equations were first derived from experimental data for the DMO hydrogenation to MG using Ag/SiO2 catalyst.Subsequently,a comprehensive two-dimensional bed-particle dual-scale model was developed to elucidate the transport and reaction dynamics of DMO hydrogenation at both scales.The impact of the active component distribution inside catalyst pellets on their catalytic performance in a single-tube reactor was investigated.Simulation results show that there is a serious problem of excessive hydrogenation of MG in reactors using uniform catalysts.Using eggshell catalysts can effectively suppress the formation of excessive hydrogenation product ethylene glycol,improve the yield of MG,and can reduce the dosage of active components and significantly improve the economic benefits of the DMO hydrogenation to MG process.These findings offer fundamental insights and practical guidance for the design and fabrication of industrial catalysts tailored for DMO hydrogenation to MG.关键词
草酸二甲酯/加氢/动力学/双尺度模型/蛋壳型催化剂/数值模拟Key words
dimethyl oxalate/hydrogenation/kinetics/dual scale model/eggshell pellet catalyst/numerical simulation分类
化学工程引用本文复制引用
何传超,周静红,曹约强,施尧,周兴贵..Ag/SiO2催化草酸酯加氢制乙醇酸甲酯的床层-颗粒双尺度耦合模拟研究[J].化工学报,2025,76(2):654-666,13.基金项目
国家自然科学基金项目(22178102,22478106) （22178102,22478106）
