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催化学报  2014 

NaOHmodifiedWO3/SiO2catalystsforpropyleneproductionfrom2-buteneandethylenemetathesis

DOI: 10.1016/S1872-2067(12)60760-8, PP. 232-241

Keywords: Propylene,Olefinmetathesis,Tungstentrioxide,Silicondioxide,Sodiumhydroxidetreatment,Acidity,Pyridine

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Abstract:

？AWO3/SiO2catalystisusedinindustrytoproducepropylenefrom2-buteneandethylenemetathesis.CatalystswithvariousWO3loading(4%to10%)werepreparedbyimpregnationandtestedforthemetathesisofetheneandtrans-2-butene.IonexchangeofNaOHontotheWO3/SiO2catalystwasusedtomitigatetheacidityofthecatalystsinacontrolledway.AtlowWO3loading,thetreatmentwithlargeamountsofNaOHresultedinasignificantdecreaseinmetathesisactivityconcomitantwithsignificantWleachingandmarkedstructuralchanges(XRD,Raman).AthigherWO3loading(6%to10%),thetreatmentwithNaOHmainlyresultedinadecreaseinacidity.FT-IRexperimentsafteradsorptionofpyridineshowedthattheLewisacidicsiteswerepoisonedbysodium.Nevertheless,themetathesisactivityremainedconstantaftertheNaOHtreatment.Thissuggestedthattheremainingacidityonthecatalystwasenoughtoensuretheefficientformationofthecarbeneactivesites.Interestingly,Napoisoningresultedinsomemodificationoftheselectivity.Themitigationofaciditywasshowntofavorpropeneselectivityovertheformationofisomerizationproducts(cis-2-butene,1-butene,etc.).Moreover,treatmentwithNaOHledtoashorterinductionperiodandreducedcokeformationontheWO3/SiO2catalyst.

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