CeO_2c2_-ZnO催化剂上甲醇水蒸气氧化重整制氢反应分析

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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旷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