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ID:58524556
大小:1.16 MB
页数:82页
时间:2020-10-21
《分子筛催化材料ppt课件.pptx》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
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
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