資源描述：
《Recent Advances in the Understanding of Zeolite Synthsis》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、RecentAdvancesintheUnderstandingofZeoliteSynthesisRobertW.ThompsonDepartmentofChemicalEngineering,WorcesterPolytechnicInstitute,100InstituteRoad,Worcester,Massachusetts01609,USA.E-mail:rwt@wpi.edu1Introduction...............................11.1Background................................21.
2、2CrystallizationMechanisms.......................42ThermodynamicConsiderations....................63Nucleation................................73.1ClearSolutionStudies..........................134ZeoliteCrystalGrowth..........................204.1TheTuggingChainModel.......................
3、.245UseofSeedCrystals...........................266Conclusions................................297References.................................311IntroductionTheobjectiveofthischapteristoreviewtheopenliteratureonmolecularsievezeolitesynthesis,highlightinginformationregardingthefundamentalmec
4、hanismsofzeolitecrystallizationinhydrothermalsystems.Thetext,therefore,focusesonthethreeprimarymechanisticstepsinthecrystalliza-tionprocess:nucleationofnewpopulationsofzeolitecrystals,growthofexistingpopulationsofcrystals,andtheroleplayedbyexistingzeolitecrystalmassinthesubsequentnucleati
5、onofnewcrystalsorthegrowthofzeolitecrystalsinthesystem.Theperspectivetakeninthiswork,basedonresearchresultsfromthelitera-ture,hasbeenthatmolecularsievezeolitecrystalsareformedfromthespeciesdissolvedinthecausticsolutionmedium,andthatformationofzeolitesbysolid-solidtransformationsdoesnotocc
6、ur.Assuch,classicaltreatmentsofMolecularSieves,Vol.1?Springer-VerlagBerlinHeidelberg19982R.W.Thompsoncrystallizationsystemsshouldadequatelydescribemolecularsievezeolitecrystallizationprocesses.However,itissuggestedthatthisabsoluteperspectivemayhavetobemodifiedtoqualifyourfuturethinking,as
7、notedinthisreview.Somerecentworkhasinvestigatedtheveryearlytransformationsoccurringinseveralofthesealumino-silicatesystems,andrevealedthatcolloidalassemblagesmayformjustpriortothecreationofcrystalnuclei,andmaybeprecursorstonucleation.Consequently,thesourceofnucleima
