富氧条件下Mn2fHFBZ上CH_2c4_选择催化还原NO的分析

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1、太原理工大学硕士研究生学位论文SELECTIVECATAI。YTICREDUCTIONOFNOBYCHaOVERMn／HFBZINTHEPI己ESENCEOFEXCESSOXYGENABSTRACTNOx(NO+N02，NOaccountsfor95％)isamainpollutantintheatmosphere．Itsemissioncausesseriousimpactsonhumanhealthandtheecologicalenvironment．Therefore，reducingtheemissionofNOxha

2、sbecomeallextremelyemergenttaskoftheenvironmentalprotection．Nowadays，selectivecatalyticreductionofNObymethane(CH4-SCR)isoneofhi曲lyefficientwayintheremovalofnitrogenoxides．Preparingcatalystswithhighactivity,selectivityandS02andH20toleranceshouldbesolvedbeforepractical

3、applicationoftheCl-h—SCRtechnology．Theinvestigatingtasksareputforwardunderthisresearchbackgroundinthispaper．At)，peofnewzeolitecompositeFBZwithFAUandBEAtopologystructurewassynthesized．SelectivecatalyticreductionofNqinthepresenceofexcessoxygenwasinvestigatedsystemicall

4、yoverMn—ion—exchangeH—FBZcatalysts．XRD，FT-IR，FE—SEM，NH3一TPD，H2一TPRtechniqueswereappliedtocharacterizethecatalysts．TheH20andS02toleranceofthecatalystswerealsostudied．Itisfoundthatthetopologystructureofthecarrierstronglyaffectsthecatalyticpropertiesofthecatalysts．TheS0

5、2andH20toleranceofthecatalysmisalsoaffectedbythecarrieLThemainresearchresultsobtainedinthispaperwillbeshownasfcIllows：1．ZeolitecompositewithFAUandBEAtopologystructureCallbesynthesizedsuccefullywithtwostephydrothermalcrystalyzingmethod．OnlycharacteristicpeaksofFAUandB

6、EAtopologystructureareobservedovertheXRDpatternsofFBZ．TherelativecontentofthetwokindsoftopologyITI太原理：r大学硕士研究生学位论文structurecanbeobtainedbytheXRDresults．CharacteristicpeaksofFAUandBEAtopologystructureareobservedintheFTIRspectraofthecatalysts．Nooctahedralmorphologyisob

7、servedintheSEMimagesofthezeolitecomposite，whereasitcannotbeexcludedcompletely．HomogenousellipsemorphologyisobservedintheSEMimageofzeolitecomposite．ThemorphologyissimilartothatoftheBetazeolitebecausethezeolitecompositeFBZissynthesizedbyovergrowingorepitaxiallygrowinga

8、layerofzeoliteBetaonthepseudo。crystalofFAUzeolite．2．NH3．TPDresultsshowthatanewkindofstrongacidicsitesisformedonH．FBZ．Theseacidicsit