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1、AngewandteChemieDOI:10.1002/anie.201000452NanoparticlesHighlyActiveIronOxideSupportedGoldCatalystsforCOOxidation:HowSmallMusttheGoldNanoparticlesBe?**YongLiu,Chun-JiangJia,JunYamasaki,OsamuTerasaki,andFerdiSchüth*DedicatedtoProfessorRüdigerKniepontheoccasionofhis65thbi
2、rthday[1]SincethepioneeringstudiesofHarutaetal.,COoxidationcatalystandtheactivityinCOoxidationwascorrelatedwithoversupportedgoldnanoparticleshasbecomeoneofthethepresenceofgoldclusterswhichareabout0.5nmin[2][9]mostextensivelystudiedsystemsinheterogeneouscatalysis.diamet
3、erandcontainaroundtengoldatoms.MostofthestudieshavebeenfocusedontheoriginoftheTheoriginofthisstillunclearsituationlies—amongotheruniquecatalyticactivityofgoldnanoparticles.Thereasonsforfactors—mainlyinthewidesizedistributionofgoldnano-thisarethatontheonehanditisofgreat
4、scientificinterestparticles.Bytheconventionalmethods,especiallyforcopre-andontheotherhanditmaysupportthedevelopmentofnewcipitation,typicallygoldnanoparticleswithawidesizecatalystsindifferentfieldssuchasautomotivecatalysisanddistributionof<1nmtoabout20nmareobtained,whic
5、h[3]polymerelectrolytefuelcells.Specifically,preparationofmakestheidentificationoftheactivespeciesextremely[4]activegoldcatalystsinfluencesthesizeandshapeofthegolddifficult.Tohelpclarifythissituation,thecolloidaldeposition[5][6]nanoparticles,theroleofthesupport,theoxid
6、ationstatemethodseemstobemoresuitablebecausethegoldcolloidis+3+[7]oftheactivegoldspecies(metallic,AuorAu),andthealreadygeneratedbeforetheadditionofthesupport.[6a,8]oxygensupplypathways.Unfortunately,however,manyFurthermore,thesizeofgoldnanoparticlesispreservedreportsar
7、ehighlycontroversialandthedebateislikelytoafterthedepositionontothesupport.Thus,thismethodhascontinueforsometimeowingtothesensitivityandcomplex-beenusedtostudytheeffectofthesupportingold[10]ityofgoldcatalysis.Takingtheinfluenceofgoldparticlesizecatalysis.Forallthegoldc
8、atalyststested,goldnano-asanexample,ithasbeenbelievedthatgoldnanoparticlesofparticleswereinthesizerangeofaround2–5nm,
