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1、TopicsinCatalysisVol.29,Nos.3–4,June2004(Ó2004)95Catalysisbygoldnanoparticles:epoxidationofpropeneaaab,A.K.Sinha,S.Seelan,S.Tsubota,andM.Haruta*aNationalInstituteofAdvancedIndustrialScienceandTechnology-Kansai,1-8-31Midorigaoka,Ikeda,Osaka,JapanbResearchInstituteforGreenTechnology,AI
2、ST,Onogawa16-1,Tsukuba305-8569,JapanSupportednano-goldcatalystshaveattractedrapidlygrowinginterestduetotheirpotentialapplicabilitytovariousreactionsofindustrialandenvironmentalsignificance.Inthisarticle,wefocusontheadvancesrelatedtothedirectvapor-phaseoxidationofpropenetopropeneoxidei
3、nthepresenceofmolecularoxygenandhydrogenovergoldcatalystssupportedonTi-incorporatedsilicamaterialspreparedbydifferentmethods.Theimportanceofcatalystpreparationandpretreatmentmethod,natureofsupportmaterial,Auparticlesizeandloadingamountisemphasized.Possibilitiestoenhancethecatalystper
4、formancebyusingpromotersandbysilylationarealsodiscussed.KEYWORDS:propeneepoxidation;propeneoxide;goldcatalyst;titanosilicate.1.IntroductionSinceHayashifoundthatAusupportedonTiO2(Degussa,p-25)couldcatalyzetheepoxidationofGoldsurfaceshavelongbeenregardedasinert.Theoreticalcalculationsh
5、aveshownthatthesurfaceofpropeneinthegas-phaseusingO2andH2[12],thecatalyticpropertiesofAu/TiO2andrelatedsystemshaveAuisnobleinthedissociativeadsorptionofhydrogenattractedchemicalindustries[13–15]aswellasacademia[1].However,whenAuisdepositedasnanoparticleson[16–21].Inaseriesofpapersweh
6、avereportedthemetaloxidesbyco-precipitationordeposition-precipi-vapor-phaseepoxidationofpropeneoverhighlydis-tation(DP)techniques,itexhibitssurprisinglyhighcatalyticactivityforCOoxidationatatemperatureaspersednanosizeAuparticlessupportedonTiO2,TiO2/SiO2[12,19–22]andtitanosilicatessuc
7、hasTS-1,lowas200K[2,3].ThesefindingshavemotivatedTi-MCM-41,Ti-MCM-48[23–31],hydrophobicTi-con-researcherstoinvestigatethecatalyticactivityofAutainingsilsequioxane[32],Ti-SiO2[33].However,thenanoparticlessince1990s.problemsforindustrialviabilitystillexistduetolowPOPropeneoxide(PO)isani
8、mportantbulk
