摘要
Abstract
CO2 hydrogenation to methanol(CH3OH)not only reduces CO2 emissions but also relieves energy shortage,which is considered one of the effective means to achieve"carbon neutrality".Cu/ZnO/Al2O3(CZA)catalysts are widely used in CH3OH synthesis due to their low cost and high catalytic activity and their component structure and surface characteristics have a significant impact on catalytic performance.In order to investigate the effect of n(Cu)/n(Zn)on the physicochemical properties and catalytic performance of CZA catalysts,a series of CZA catalysts with different n(Cu)/n(Zn)were prepared by coprecipitation-calcination method and characterized by XRD,SEM,HRTEM,XPS,ICP-MS,H2-TPR,CO2-TPD and other characterization methods,and they were used for catalytic CO2 hydrogenation to CH3OH reaction.The results indicate that the n(Cu)/n(Zn)affects the physicochemical properties of catalysts,such as Cu particle size,specific surface area,ratio of numbers of Cu0 and Cu+(N(Cu0)/N(Cu+))on the surface,reducibility and surface alkalinity.The Cu particle size of CZA-R-2(n(Cu)/n(Zn)is 2)is 5.32 nm,and the specific surface area is 53.5 m2/g,and the surface N(Cu+)/N(Cu0)is 0.9.At 220 ℃,2 MPa and volume space velocity of 7500 mL/(h·g),CZA-R-2 exhibits the best CO2 conversion rate(15.5％)and CH3OH selectivity(67.0％).At the same time,the CH3OH yield reaches 10.4％.In addition,CZA-R-2 runs smoothly for over 200 h under the same conditions and shows good stability.关键词
Cu/ZnO/Al2O3催化剂/CO2加氢/甲醇/n(Cu)/n(Zn)Key words
Cu/ZnO/Al2O3 catalyst/CO2 hydrogenation/methanol/n(Cu)/n(Zn)分类
化学化工
