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1、浙江工業(yè)大學(xué)碩士學(xué)位論文STUDYONSUPPORTEDGOLDNANOCATALYSTSFORSELECTIVEHYDROGENATIONOFPHTHALICANHYDIUDETOPHTHALIDEABSTRACTPhthalideisoneimportantintermediateoffmechemicals,whichisconventionallyusedinpharmaceuticals,pesticidesanddye.Selectivehydrogenationofphthalican
2、hydrideisagreenrouteforphthalidesynthesis.Duringhydrogenationofphthalicanhydride,severalbyproductswillbeobserved.Soit’Snecessarytoexplorecatalystswithhi曲activityandselectivity.Inthisthesis,aseriesofsupportedgoldcatalysts,preparedbydeposition—precipitat
3、ionmethod,werefirstlyusedforphthalicanhydridehydrogenation.Theinfluencesofsupporttype,Auloading,calcinationandreductiontemperatures,promotersandpHvalueonthecatalyticpropertiesofthegoldcatalystsweeinvestigated.Thestabilityandthedeactivationmechanismofth
4、egoldcatalystswerealsostudied.ThecatalystswerecharacterizedbymeansofX—raydiffraction(XRD),nitrogenadsorption—desorption(BET),inductivelycoupledplasma—atomicⅡI浙江工業(yè)大學(xué)碩士學(xué)位論文emissionspectrometry(ICP—AES),transmissionelectronmicroscopy(TE舊,andfouriertransfo
5、rminfraredspectroscopyfiT-m).TheresultsshowthatthegoldcatalystpreparedwithTi02assuppport,2.0wt%ofgoldcontent,and5.0wt%ofFe203promoterexhibitesexcellentcatalyticactivityandselectivityforthehydrogenationofphthalicanhydride.ThesizeofAuparticlesatthesurfac
6、eOverAufI'i02catalystpreparedundertheoptimalpreparationconditionsofpHvalueabout8.10,calcinationtemperture300oC,reductiontemperature200oCandcalcinationtime4h,theconversionofphthalicanhydrideandtheselectivitytophthalideis97.63%and95.24%,respectively,when
7、thereactiontimeiS9h.Fe3+CanexpandthecrystallatticeofTi02andformsitesofcrystaldefects,whichisinfavorofintegrationbetweengoldatomandsupport.Inaddition,existenceofFe3+Canenhancethermalstabilitymechanicalstrengthofporewall.Therefore,additionof5.0wt%promote
8、rironoxideobviouslyimprovestheselectivityandstabilityofAu/Ti02catalystinphthalicanhydridehydrogenationreaction.ThereactionconditionsofphthalicanhydridehydrogenationoverAu/Fe203-Ti02catalystwereoptimizedasfollows:reactiontemperature190oC