www.watergasheat.com lowTempWaterGasShift 低温水煤气变换反应_图文.doc

lowTempWaterGasShift 低温水煤气变换反应_图文 导读：就爱阅读网友为您分享以下“lowTempWaterGasShift 低温水煤气变换反应_图文”的资讯，希望对您有所帮助，感谢您对92的支持! AppliedCatalysisB:Environmental27(2000) 179–191 Low-temperaturewater-gasshiftreactionoverCu-and Ni-loadedceriumoxidecatalysts YueLi1,QiFu,MariaFlytzani-Stephanopoulos? DepartmentofChemicalEngineering,TuftsUniversity,Medford,MA02155,USAReceived23August1999;receivedinrevisedform29February2000;accepted3March2000 Abstract InthispaperwereportontheactivityofCu-andNi-containingceriumoxidecatalystsforlow-temperaturewater-gasshift(WGS).Bulkcatalystswerepreparedinnanocrystallineformbytheureaco-precipitation–gelationmethod.Lanthanumdopant(10at.%)wasusedasastructuralstabilizerofceria,whilethecontentofCuorNiwasintherangeof5–15at.%(2–8wt.%).Atlowmetalloadings,CuorNiwerepresentintheformofhighlydispersedoxideclusters,whileathighloadings,clustersaswellasparticlesofCuOorNiO(gt;10nminsize)werepresentonceria.BothCuandNiincreasedthereducibilityofceria,asevidencedbyH2-TPRexperiments.TheWGSreactionactivityofCe(La)Oxwasincreasedsigni?cantlybyadditionofasmallamount(2wt.%)ofCuorNi.Thecatalystswerenotactivatedpriortotesting.Steady-stateWGSkineticsweremeasuredoverthetemperaturerangeof175–300and250–300?C,respectively,forCu-andNi–Ce(La)Ox.TheactivationenergyofthereactionoverCe(La)Oxwas58.5kJ/mol,whileitwas38.2and30.4kJ/mol,respectively,overthe5at.%Ni–Ce(La)Oxand5at.%Cu–Ce(La)OxcatalystsinCO-richconditions.Aco-operat