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1、AbstractTheoxidativesteamreformingofmethanol(OSRM)isconsideredasoneofthemostpromisingroutesforthehydrogenproductionfrommethanolbecauseofthelowreactiontemperature,theacceptablehydrogenyieldandthepossibilitytoeliminateCOduetothepresentofH20.In011I"study,Cel.xZnxOvcatalystsWithdifferentCe/Znratioprepa
2、redbycomplexation—combustion,coprecipitationandwetnessimpregnationrouteswereusedinOSRMprocess,XRD,XPS,HE-TPRwereusedtocharacterizethestructureandthepropertiesforthecatalysts.WefoundtheadditionofZnOCanimprovethecamlyticperformance.WhenX<0.1,theCel-xZnxOvbycomplexation-combustionshowedthebestactivity
3、whichCanbeattributedtotheformationofCel-xZnxOvsolidsolution.ThispiontWasalsoprovedbytheXRDresultsandthecatalyticactivityofthe舶ShCe0.92Zn0.0sOycatalystscomparedwiththeCe0.92Zn0.080ywhichWastreatedwithaq.HN03.WhileX>0.1.thecatalyticperformanceforCel.xZnxOvcatalystswasintheorderasCel.xZnxOy—WI>Cel.xZn
4、xOv-CP>Cel.xZnxOv—CC,however,allofthemshowedtheirownbestcatalyticperformanceatx=0.3.TheresultofXRDshowedtheCel.xZnxOv-WI(x>0.1)catalystsexhibitedthesmallestCe02andZnOcrystallite.ItWasprovedbyXPSthattheratioofOHgroupinthesurfaceoxygenspeciesofCel.xZnxOy-WI(x>O.1)weremorethanthatofthosebyotherprepara
5、tionmethods.TheamountofH2consumptionforthelowtemperaturereductionspeciesinH2-TPRWasalsocorrespondingtotheratioofOHgroupinthesurfaceoxygenspecies,SOCel.xZnxOy-V曠lconsumedthemostamountofhydrogenduringH2-TP&whichalsomadecontributionforthecatalyticperformancewhenx>0.1.TaketheCe0.7Zn0.30yforcomparisonwh
6、ichshowedthebestcatalyticperformanceinthecatalystsbyeachrout.A120hTOStestwasinvestigated,theresultsofwhichshowedustheAbstractCeo.7ZIlo.30y-W1wasWiththebeststability,whileCeo.7Zno.30Y-CPquicklydeactivated.ThiscouldbecontributedtothemigrationofZnOtothesurfaceofCe02especiallyathighertemperaturewhichwa
7、sprovedbyXPS.ByTPDandTPSRstudies,wefoundthattheadditionofZnOcanimprovetheabilityofthecatalyststoadsorbmethanol,theselectivityofCOCanbereducedsignificantly.Duringtheprocess,methanolandwaterwerefirstchemisorb