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1、CatalysisToday72(2002)5962Directgas-phaseepoxidationofpropeneoverbimetallicAucatalystsAalbertZwijnenburg,MehdiSaleh,MichielMakkee∗,JacobA.MoulijnFacultyofAppliedSciences,IndustrialCatalysis,DelftChemTech,DelftUniversityofTechnology,Julianalaan136,2628BLDelft,TheNetherlandsAbstractBimetallicAucata
2、lystshavebeenpreparedandtestedforthedirectgas-phaseepoxidationofpropeneusinghydrogenandoxygen.ModificationofAu/TiO2/SiO2catalystswithPtisbeneficialforbothactivityandselectivity.ThewaterpropeneoxideratiodecreasesuponadditionofPttoaAu/TiO2/SiO2catalyst,whiletheepoxidationactivityismaintained.Hydrogen
3、ationofpropenetounwantedpropanedoesnotoccurattemperaturesbelow373K.©2002ElsevierScienceB.V.Allrightsreserved.Keywords:Selectiveoxidation;Propene;Goldcatalysts1.IntroductiondispersedTiO2supports,suchasTiO2/SiO2andtitanium-silicalite-1(TS-1)[2,3]andTi-MCM[4,5].Thedirectgas-phasesynthesisofpropeneox
4、ide,byForindustrialapplicationstheefficiencyofhydrogentheuseofmolecularoxygen,haslongbeendesired.shouldbeincreasednotonlytofavorprocesseco-HighlydispersedAu/TiO2catalystsshowanextraor-nomics,butalsodecreasetheamountofheatreleaseddinaryselectivityintheoxidationofpropenetotheinthereactor.correspondi
5、ngepoxide(>99%),usingacombinationInrecentliterature[2,6],ahydroperoxide-likeinter-ofH2andO2asoxidationmixture[1].Additionalmediatehasbeenproposedtoberesponsibleforthestudiesoftheepoxidationreactionindicatedseveralselectiveepoxidation.ThisoxidizingspeciesissaiddrawbacksoftheAu/TiO2catalyst.Firstly
6、,thelowtobeformedovergoldandsubsequentlyusedforconversion(12%)obtainedundertypicalreactionepoxidationovertheTi-containingsupport.Althoughconditions(atmosphericpressure,323423K)cannotgoldisknowntocatalyzetheformationofhydrogenbeimprovedbyincreasingthereactiontemperature,peroxidefromH2andO2andthisi
7、salsosupportedbecausethisleadstoextensiveby-productformation.bytheoreticalpredictions[7]mostpatentsdescrib-Secondly,thelowefficiencyofhydrogen(relativelyingH2O2directsynthesisarebasedonbimetallicPdlargeamountsofwaterare
