分子筛催化材料ppt课件.pptx

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1、分子筛催化材料设计与制备点击添加文本点击添加文本点击添加文本点击添加文本MethodsCharacterizationInstancesBackgroundBackgroundDefinitionMolecularsieveisakindofmaterialhasauniformporesize,whichisequivalenttotheaveragesizeofthemolecule.DevelopmenthistoryIn1756,peoplefirstdiscoverednaturalzeolites.In19thcentury

2、,peoplehadafurtherunderstandingofthemicroporousproperties,adsorptionandionexchange.In1940s,zeolitechemistledbyBarrerRMfirstlysynthesislowsilicaaluminaratioofzeolitemolecularsieve.DevelopmenthistoryzeolitemicroporemesporousmacroporeClassification＜2nm2~50nm＞50nmApplication

3、MainpropertiesAdsorptionperformanceIonexchangeperformanceCatalyticperformanceMainapplicationareasPetroleumprocessingPetroleumchemicalindustryFinechemicalDailychemicalindustryProspectsFCC: ExploitnewzeolitessimilartoZSM-5withhighselectivitytowardsproducelightolefinsHDC:Ex

4、ploitprolificmiddledistillateszeolitesAliphaticalkylationIsomerizationofalkanesOthervarietiesdevelopmentStructureTO4tetrahedronTO4tetrahedronshareoneoxygenvertexPrimarystructuralunitsMolecularsieveiscomposedofthree-dimensionalfourconnectingframebythesharedvertexoftheTO4t

5、etrahedron.TusuallyreferstoSi,Al,orP.InrarecasesTreferstoB,Ga,Beandsoon.StructureAluminosilicatemolecularsieveconsistedof[SiO4]and[AlO4]tetrahedroncontainsbackboneanion,thenegativelychargeofbackbonearebalancedwithadditionalcations.Aluminosilicatemolecularsieve’schemistry

6、generalformulaisAx/n(SiO2)(AlO2)x·mH2O.StructureSecondarystructuralunitsThebackboneofmolecularsievecouldbeseenascomposedoffiniteelementunitorinfiniteelementunit.Thepictureshows18finiteelementunitsoftetrahedrabackbone.StructureCharacteristiccagetypestructureunitSomecharac

7、teristicsofcagetypestructuralunitsareexistedincharacteristiccagetypestructureunit.CagetypestructureunitinmolecularsievebackboneStructureFeaturesofthechainandlayeredstructureunitsIntheskeletonstructureofmolecularsieve,wecanfindsomeofthefeaturesofthechainstructureunit.Stru

8、ctureFeaturesofthechainandlayeredstructureunitsStructureofmolecularsievecanalsobedescribedbytwo-dimensi