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1、featureCatalysisofgoldnanoparticlesdepositedonmetaloxidesGoldinbulkischemicallyinertandhasoftenbeenregardedtobepoorlyactiveasacatalyst.However,whengoldissmallenough—withparticlediametersbelow10nm—itturnsouttobesurprisinglyactiveformanyreactions,suchasCOoxidationandpropyleneepoxidation.Thisisesp
2、eciallysoatlowtemperatures.Here,asummaryofthecatalysisofAunanoparticlesdepositedonbasemetaloxidesispresented.ThecatalyticperformanceofAuisdefinedbythreemajorfactors:contactstructure,supportselection,andparticlesize,thefirstofwhichbeingthemostimportantbecausetheperimeterinterfacesaroundAuparticl
3、esactasthesiteforreaction.MasatakeHarutaResearchInstituteforGreenTechnologyNationalInstituteofAdvancedIndustrialScienceandTechnology(AIST)16-1Onogawa,Tsukuba305-8569,Japantel:+81-298-61-8240fax:+81-298-61-8240e-mail:m.haruta@aist.go.jpHeterogeneouscatalystscurrentlyusedareclassifiedintosynthesi
4、sinthechemicalindustry.Ontheotherhand,Auhasthreetypesofcompounds:metaloxides,metalsulfides,andahighionizationpotentialandaccordinglyhaspooraffinitymetals.Metaloxidesareusedmainlyforselectiveoxidationtowardsmolecules.Surfacescienceinvestigations[6~8]andofhydrocarbons[1]andselectivereductionofNOx
5、withtheoreticalcalculations[9]haveprovedthatnodissociativeNH[2].MetalsulfidesareusedforhydrodesulfurizationofadsorptionofHandOtakesplaceoverthesmooth322petroleum[3].MetalsaremostwidelyusedforavarietyofsurfacesofAuattemperaturesbelow473K,indicatingthatreactions[4],includinghydrogenation,complete
6、andpartialAuiscatalyticallyinactiveforhydrogenationandoxidation.oxidation,andreductionofNOxwithhydrocarbons[5].Indeed,theconventionalsupportedAucatalystsweremuchActually,catalyticmetalsarelimitedto12elementsoflessactivethansupportedPtgroupmetalcatalysts.But,groupVIIIandIbofthePeriodicTable.Most
7、widelyuseditshouldbenotedthatthesesupportedAucatalystswerearethe3dmetalsofFe,Co,NiandCu,the4dmetalsofnotashighlydispersedasothersupportednoblemetals.Rh,PdandAg,andthe5dmetalofPt.Ruthenium(4d)andWhentheywerepreparedbytheimpregnatio
