高硅铝比的纳米zsm5沸石分子筛的合成

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1、高硅铝比的纳米ZSM-5沸石分子筛的合成SynthesisofNanosizedZSM-5ZeolitewithhighMolarRatioofSilicatoAluminaAbstractThecrystalsizeofzeoliteisallimportantfactorthataffectsthepropertiesofzeolite．NanosizedZSM-5zeoliteshavelargere)【temalsurface，hi曲surfaceenergyandshorterchannelsascomparedwiththemicmsiz

2、dzeolites．whichareparticularlysuitedforcatalysisapplications．But。investigationsshowthatthethermalstabilityofnanosizedZSM一5isnotsogoodasthatofmicrosizedZSM一5．Toimproveit,thesynthesisofnanosizedZSM一5zeoliteswithhigllmolarratioofsilicatoaluminahavebeensynthesizedsuccessfullyinthis

3、thesis，whichwerecharacterizedbyX-raydiffraction，transmissionelectronmocmscope，scanelectronmocroscope，X-rayfluorescence．Abettersynthesiswasselectedandwasenlargedina100Lautoclave．Goodresultshavebeenachieved．FactorsaffectingthesynthesisofZSM一5zeolitewithtraditionalmethodareinvesti

4、gatedsuchaScrystallizationtemperature，supersaturateddegeeofreactionmixture，saltamount，alkalinity，seederystalsize，stirringrate，thesequenceofaddingmaterialandsoon．Inthispaper，twosynthesismethodsofZSM-5zeolitesweredevelopedbasedonthetraditionallysyntheticmethod．oneistoaddalittlemo

5、untoftweenseriesasnomohicsurfactants．TheothermethodiStouseiso．pmpylalcoholandn．ButylamineasCO．template．Resultsshowthattweenseries(tween20，tween40，tween60，twccn80)carldecresecrystalsize．BecausetweenserieswouldbesaponifiedunderthehighPHofsystemandchangedintopolyoxyethylenesorbito

6、lanhydrideandhardsoapwhichreducethesurfaceenergyoflittleparticles．Resultsshowedthattween20isthebestchoice．Inthesystemofiso-pmpylalcoholandn-butylamineasco-template，themolarratioO，36ofiso-propylalcoholton-butylamineisfavorable．SodiumchlorideplaysdifferentroleinthedifferentsyNemo

7、ftwcenseriesandco-template，thepresenceofsodiurnchlorideinthetweenserieshasnegtiveeffecttotheformationofnano-sizeZSM一5．however,thepresenceofsodiumchlorideinthesystemofiSO—propylalcoh01andn-butylamineaSco-templatehaspositiveeffect．thesuitableratioofNaCltoAl203iS57．8．Thethermo—and

8、hydrotherm-ostabilityofnanosizedZSM一5zeoli把Swerecompar