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硅胶负载型聚烯烃催化剂(Ⅰ)──不同类型硅胶载体热活化颗粒的TEM和SAED研究.docx

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硅胶负载型聚烯烃催化剂(Ⅰ)──不同类型硅胶载体热活化颗粒的TEM和SAED研究 Title:TEMandSAEDStudyofThermalActivationofPolyolefinCatalystsSupportedonDifferentTypesofSilicaGelCarrierParticles Abstract: Polyolefincatalystssupportedonsilicagelcarriershavebeenwidelyusedinthepolymerindustryduetotheirexcellentcatalyticperformance.Thethermalactivationprocessplaysacrucialroleintheactivationanddeactivationofthesecatalysts.Inthisstudy,transmissionelectronmicroscopy(TEM)andselectedareaelectrondiffraction(SAED)techniqueswereemployedtoinvestigatethethermalactivationofpolyolefincatalystssupportedondifferenttypesofsilicagelcarrierparticles.Theresultsprovidevaluableinsightsintothestructure,morphology,andcrystallinityofthecatalystparticlesduringtheactivationprocess. Introduction: Polyolefincatalystsarecommonlyusedintheproductionofvariousplasticmaterials,suchaspolyethyleneandpolypropylene.Thesupportmaterialusedinthesecatalystshasasignificantimpactontheircatalyticperformance.Silicagelisanattractivechoiceasasupportmaterialduetoitshighsurfacearea,thermalstability,andtunableproperties.Understandingthethermalactivationprocessofsuchpolyolefincatalystssupportedonsilicagelcarriersisessentialforoptimizingtheircatalyticperformance. Methodology: Polyolefincatalystswerepreparedbyimpregnatingthesilicagelcarrierparticleswithcatalyticallyactivecomponents.Thesampleswerethensubjectedtodifferentthermaltreatments,andthestructuralandmorphologicalchangeswereanalyzedusingTEMandSAEDtechniques.TheimagesobtainedfromTEMwereusedtodeterminetheparticlesizedistributionandobservethedispersionofactivecomponentsonthesilicagelsurface.TheSAEDpatternswereusedtoidentifythecrystallinephasespresentinthecatalysts. Results: TheTEManalysisrevealedthattheparticlesizedistributionofthecatalystssupportedondifferenttypesofsilicagelcarriersvariedsignificantly.Theuseofmesoporoussilicagelresultedinsmallerparticlesizeswithamoreuniformsizedistributioncomparedtotheuseofmicroporoussilicagel.Thedispersionofactivecomponentsonthesilicagelsurfacewasalsomorehomogeneousformesop