Mn--Ce--Ti催化剂上NH3选择性催化还原NOx的分析

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1、北京化工大学硕士学位论文进了活性中间物种的生成，有利于提高催化剂的催化活性。关键词：氮氧化物，选择性催化还原，Mn-Ce．Ti催化剂，氧化还原循环ⅡABSTRACTMn—Ce—TicatalystsonNH3selectivecatalyticreductionofNOxBasedontheselectivecatalyticreductionofNOxwithNH3asthemodelreaction，westudiedthecatalyticperformanceoftheMn-Ce—Timultipleoxidecatalysts．Bymodulatingthemolarrat

2、ioofmetalcomponent,wefoundthatthehighestactivitycatalystWasMno．2Ceo．1Tio．9，whichcouldreachmorethan90％NOxconversionin150—300℃．ComparedwithMno．2Tio．8andCe0．1Tio．9catalysts，Mno．2Ceo．1Tio．9catalysthashigheractivity,aswellasgreatresistancetOH20andS02．ByusingXRD，BET,XPS，SEM，RamanandDRIFTScharacteriza

3、tionmethods，wecharacterizedandanalysedthestructureofthecatalysttoexploremechanismoftheMn-Ce·TimultipleoxidecatalystinreactionofeliminatingtheNOx．XRD，BETandSEMresultsshowedthatthecatalystsofMn-Ce-Timixedoxidepreparedbythehydrothermalmethodhavehighspecificsurfacearea．ThesynergeticeffectamongMn，Ce

4、andTicontributestoinkibtthecatalystsfromformingcystallizaionstructure．TheamorphousphasehadformedintheMn—Ce—Ticatalystparticlesthe．ItmeantthatMnOxandCe02havegooddispersionontheTi02surface．HE—TPRresultsshowedthatMno．2Ceo．1Tio．7catalystloweredthereactiontemperatureofCe4+一Ce3+，whichenhancedthereduc

5、ibilityofCe02，andpromotedtheredoxpropertiesⅡI北京化工大学硕士学位论文ofcatalyst．XPSresultsshowedthatthecomentofM／13+inthecatalystwashigherinMno．2Ce0．1Ti0．9catalyst，itmightbeduetothetworeductionprocessofCe4+_Ce3+andTi4+_Ti3+whichtransferedelectrontoMn4+andreducedtoMn3+．DRIFTSexperimentsshowedthatmoreactiveN

6、H3andN02specieswereabsorbonthesurfaceofMno．2Ceo．1Tio．7catalyst．Theproductionoftheactiveintermediates，improvedthecatalyticreaction．Inshort，thesynergeticeffectamongMn,CeandTiofMno．2Ceo．1Tio．9catalystmayproduceadualredoxcycles(M一+Ce3+HMn3++Ce4+，耐++Ti3+HMn3++Ti4+)andtheamorphousstructureplayskeyrol

7、esforthehighcatalyticdeNOxperformance．inaddition,ThesynergeticeffectamongMn，CeandTialsocomributestotheformationofreactiveintermediatespecies，thuspromotingtheNH3一SCRtoproceed．KEYWORDS：Nitrogenoxides，Selectivecatalyticreduction，Mn—C