hasuploaded_ceo-al-复合载体的制备及其负载

(030001)CeO2γ-Al2O3PdXRDH2-TPRCO-FTIRCOCeO2γ-Al2O3CeO2Pdγ-Al2O3H2(CO)CeO2/Al2O3PreparationofCeO2/Al2O3co-SupportsandthePropertiesofPdSupportedCatalystsYangCheng,WangTaiying,RenJie,LiWenhuai,SunYuhan(StateKeyLaboratoryofCoalConversion,InstituteofCoalChemistry,ChineseAcademyofScience,P.O.Box165,Taiyuan030001)AbstractCeO2modifiedγ-Al2O3supportswerepreparedbydeposited-precipitationmethodorimpregnationmethod,andthenthePdsupportedcatalystswerepreparedandtestedformethanoldecomposition.ThestructureandreducibilityandCOadsorptionpropertyofthepreparedcatalystswerecharacterizedbyXRD,H2-TPRandCO-FTIRtechniques,respectively.ItwasfoundthathighlydispersedCeO2particleswereachievedonγ-Al2O3supportspreparedbydeposited-precipitationmethod.Inthecase,astrongPd-CeO2interactionthroughtheinterfacebetweenPdandCeO2occurred,whichresultedinhighactivityandhighselectivityofH2(CO)formethanoldecomposition.KeywordsDeposited-precipitation,CeO2/Al2O3,Interfaceeffect,Methanoldecomposition[1~3]CeO2(La2O3)γ-Al2O3Pd[4]CeO2Pd[5]CeO2/Al2O3CeO2γ-Al2O3C1E-mail:[e-mail](2001019)()160m2/gCeO25(wt)%22(wt)%γ-Al2O3Ce(NO3)3(CeO2Al2O35%22%)0.1mol/LpH=104hγ-Al2O3500°C4hCeO2/Al2O3CeO2/Al2O3Pd[5]PdPD5PD22WI5WI221.2XRDCeO2/Al2O3H2-TPRCO(CO-FTIR)Nicolet550[5]1.36mm1mL400°C1h1.8h-1(2m,Ar)PorapakT(2mAr)22.1XRDCeO2/Al2O3XRD(1)CeO2γ-Al2O3CeO2γ-Al2O3CeO25%WI5CeO2WI22CeO2CeO2CeO2γ-Al2O3PD5CeO2PD22WI22CeO22.2TPR2PdOH2[5]WI5WI22PdO100°CPdH2PdCeO2100250°CCeO2PdOCeO2Pd-CeO2350600°CWI22600°CCeO21CeO2/Al2O3XRDFig.1XRDofCeO2/Al2O3co-Aupports(1)PdOCeO2PdOCeO2PdCeO2γ-Al2O3(2)Pd-CeO2Pd-CeO2PdZrO2Pd-O-Ce[6]2TPRFig.2TPRcurvesofthecatalysts3COFT-IRFig.3FT-IRApectraofCOoncatalysts2.3FTIRCO()3COFT-IR16502200cm-1COWI5WI222078cm-11956cm-1PdCOPD5PD22COPd-CeO2COPdPdCO1788cm-1CO,Pd-CeOxCO(Pd-CO-CeOx)[7]TPRPdCeO2(Pd-O-Ce)Pd2.41Tab.1Theactivityandselectivityofthecompositionofmethand,C/(mol)%/%n(H2):n(CO)COCH4CO2DMEWI580.82.00:10083.50.50.314.4PD582.41.97:10087.20.40.511.9WI2295.22.01:10088.40.90.99.8PD22100.02.00:10092.70.20.46.9250°C,1.8h-11CeO2/Al2O3PdCeO2WI2295.2%CeO2γ-Al2O3(DME)[5]DMEPD5PD22PdCeO2PdH2CO(Pdσ+)[6]WI5WI22PD22100%CeO2γ-Al2O3DME3CeO2/Al2O3CeO2γ-Al2O3CeO2Pdγ-Al2O3Pd-CeO2PdCeO2γ-Al2O3DMEPd[1]JNArmora.Appl.Catal.,1999,176:159~173.[2].,2000,29(12):907~910.[3]YMatsumura,KKagawa,YUsamietal.J.Chem.Soc.,Chem.Commun.,1997,154:657~658.[4],,.2001,28(8):605~607.[5],,.2001,28(3):283~286.[6]WJShen,YMatsumura.Phys.Chem.Chem.Phys,2000,(2):1519~1523.[7]SBoujana,DDemri,JCresselyetal.CatalLett.,1990,(7):359~364.