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1、9082Ind.Eng.Chem.Res.2010,49,9082–9087NaYZeolitesCatalyzeDehydrationofLacticAcidtoAcrylicAcid:StudiesontheEffectsofAnionsinPotassiumSalts,,,PengSun,DinghuaYu,ZhenchenTang,HengLi,andHeHuang*CollegeofBiotechnologyandPharmaceuticalEngineering,NanjingUniV
2、ersityofTechnology,Nanjing210009,China,andStateKeyLaboratoryofMaterials-OrientedChemicalEngineering,NanjingUniVersityofTechnology,Nanjing210009,ChinaNaYzeolitecatalystswithandwithoutpotassiumsaltmodificationswerestudiedwithrespecttodehydrationoflactica
3、cidtoacrylicacid.TheselectivityforacrylicacidcouldbedramaticallyenhancedbymodificationoftheNaYcatalystswithpotassiumsalts.TheKI-modifiedNaYcatalystexhibitedthebestcatalyticperformanceforlacticaciddehydration,overwhich97.6%conversionand67.9%acrylicacidse
4、lectivitycouldbegainedat598K.CharacterizationswithTGA,XRD,Nadsorption,27AlMASNMR,XPS,NH-23TPD,CO2-TPD,andmechanismanalysisrevealedthatthecounteranionsinpotassiumsaltsexertedasignificantinfluenceonthecatalyticbehaviorsviaanelectroniceffect.1.Introduction
5、terizationsandmechanisticanalysis.OurunderstandingofthefunctionofthepotassiumsaltsinoursystemwillprovidenewAcrylicacidanditsestersaretheprimarybuildingblocksofinsightsintothecatalystrequirementsfortheoccurrenceofthe1allacrylatepolymersandplastics.Curr
6、ently,acrylicacidisdehydrationoflacticacidandthekeyfactorsincontrollingthemanufacturedmainlybytwo-steppropyleneoxidation.Thereactionroute.generaldisadvantageofthisrouteisthetotaldependenceonanonrenewablefossilresource.Thedevelopmentofanovel2.Experimen
7、talSectionprocess,whichisbothrenewableandeconomicallyviable,wouldbeofgreatimportance.2.1.Catalysts.NaYzeolites(Si/Al)2.5(0.03,determinedNewfermentation-basedtechnologiestoproducelacticacidbyXRF-1800)weretreatedwitha1mol/LNaNO3aqueousfromstarchhydrolys
8、atesaremakingthisopticallyactive,solutiontoproducethe100%Naion-exchangedformsbeforebifunctionalmoleculeintoaviablefeedstockforchemicaluse.PotassiumsaltwasintroducedintoNaYzeolitesbyan10production.Withbothhydroxylandcarboxylicacidfunctions,impr
