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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
