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1、AppliedCatalysisB:Environmental106(2011)664–671ContentslistsavailableatScienceDirectAppliedCatalysisB:Environmentaljournalhomepage:www.elsevier.com/locate/apcatbSpatiallyresolvingLNTdesulfation:re-adsorptioninducedbyoxygenstoragematerialsJin-Yong∗Luo,MeshariAL-Harbi,MarcusPa
2、ng,WilliamS.EplingDepartmentofChemicalEngineering,UniversityofWaterloo,Waterloo,CanadaarticleinfoabstractArticlehistory:SpatiallyresolvedgasconcentrationmeasurementswereobtainedalongacommercialLNTsample,con-Received3April2011tainingbothNOxstorageandoxygenstoragecomponents,du
3、ringexposuretodifferentlevelsofsulfurReceivedinrevisedform2June2011and20undermilddesulfationconditions.Forapartiallysulfatedsample,withsulfurmainlydepositedJune2011AcceptedtowardAvailableonline25June2011thecatalystinlet,duringthedesulfationsomeofthesulfurspeciesreleasedfromt
4、hefrontwerere-adsorbedalongthebackpartofthecatalyst,leadingtoredistributionofthesulfurspecies.ForthefullyKeywords:sulfatedsample,nore-adsorptionoccurred.Interestingly,forapartiallysulfatedmodelsample,Pt/BaO/Al2O3,nore-adsorptionwasobserved.Basedonthedataobtainedfromthemodela
5、ndcommer-LeanNOxtrapcialDesulfationsamples,theceria-basedoxygenstorage(OS)materialplaysacrucialroleinthissulfurre-adsorption.TheRegenerationOSmaterial’smainfunctioninthisprocessistoprovideoxygenfortheoxidationofthereleasedsul-furspeciesfromthefront,sothattheyre-adsorbattheca
6、talystback.Besidesthissulfurredistribution,SpatialresolutiontheseOSmaterialsalsoinfluencethedesulfationproducts.MoreHS,relativetoSO,isreleasedfromSulfurpoisoning22theOS-containingsamplesinceSultimatelyspentmoretimewithinthecatalystviare-adsorptionandextrareductantconsumptionb
7、ytheOSmaterials.Inaddition,NOxre-adsorptionduringregenerationwasalsoobserved,leadingtoadecreasedNOxreleaseatthetransientfromtheleantorichphases.How-ever,theextentofNOxre-adsorptionwassignificantlylessrelativetosulfurre-adsorptionunderthetestconditionsused.©2011ElsevierB.V.All
8、rightsreserved.1.IntroductionandtheNOand/orNO2issubsequentlystoredonthetrap
