The efficient hydrogenation of CO2-derived ethylene carbonate(EC)to yield methanol(MeOH)and ethy-lene glycol(EG)is a key process for indirect conversion of CO2 to MeOH.However,a high H2/EC molar ratio during the hydrogenation process(usually as 180-300)is generally required to achieve good cat-alytic performance,resulting in high cost and energy consumption for H2 circulation in the promising industrial application.Here,we prepared a series of Ni-modified Cu/SiO2 catalysts and explored the effects of synthesis methods and Ni contents on catalytic performance under different H2/EC molar ratios.The Cu/SiO2 catalyst with 0.2％(mass)Ni loading prepared by co-ammonia evaporation method exhibited above 99％conversion of EC,91％and 98％selectivity to MeOH and EG respectively at H2/EC ratio of 60.And no significant deactivation was observed within 140 h at a lower H2/EC of 40.It is demonstrated that a few of Ni addition could not only promote Cu dispersion and increase surface Cu+species due to the strong interaction between Cu and Ni species,but also form uniformly-dispersed CuNi alloy species and thus enhance the adsorption and dissociation of H2.But the excess Ni species would aggregate and segregate to cover partial surface of Cu nanoparticles,leading to a significantly drop of catalytic per-formance in EC hydrogenation.These insights may provide guidance for further design of catalysts for the ester hydrogenation reactions.

Youwei Yang;Jingyu Zhang;Yueqi Gao;Busha Assaba Fayisa;Antai Li;Shouying Huang;Jing Lv;Yue Wang;Xinbin Ma

Key Laboratory for Green Chemical Technology of Ministry of Education,Collaborative Innovation Center of Chemical Science and Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China

中国化学工程学报（英文版）

[1]Youwei Yang;Jingyu Zhang;Yueqi Gao;Busha Assaba Fayisa;Antai Li;Shouying Huang;Jing Lv;Yue Wang;Xinbin Ma-.Highly dispersed nickel boosts catalysis by Cu/SiO2 in the hydrogenation of CO2-derived ethylene carbonate to methanol and ethylene glycol)[J].中国化学工程学报（英文版）,2022(03):77-85

ethy,Cu+species

Highly,dispersed,nickel,boosts,catalysis,by,SiO2,hydrogenation,derived,ethylene,carbonate,methanol,glycol,efficient,EC,yield,MeOH,EG,key,process,indirect,conversion,However,high,H2,molar,during,usually,generally,required,achieve,good,performance,resulting,cost,energy,consumption,circulation,promising,industrial,application,Here,prepared,series,modified,catalysts,explored,effects,synthesis,methods,contents,catalytic,under,different,ratios,mass,loading,ammonia,evaporation,exhibited,above,selectivity,respectively,And,deactivation,was,observed,within,lower,It,demonstrated,that,few,addition,could,not,only,promote,dispersion,increase,surface,due,strong,interaction,between,but,also,uniformly,CuNi,alloy,thus,enhance,adsorption,dissociation,But,excess,would,aggregate,segregate,cover,partial,nanoparticles,leading,significantly,drop,These,insights,may,provide,guidance,further,design,ester,reactions

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