负载型纳米Au催化剂上苯酐选择性加氢制备苯酞的分析

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1、浙江工业大学硕士学位论文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浙江工业大学硕士学位论文emissionspectrometry(ICP—AES)，transmissionelectronmicroscopy(TE旧，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