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Yolk-ShellCatalystofSingleAuNanoparticleEncapsulatedwithinHollowMesoporousSilicaMicrospheres指导教师：AbstractSynthesisoftheAu@HMSMYolk-ShellMicrospheres2.Au@HMSMcatalyses4-nitrophenolhydrogenation3.EffectofAusizeonactivityof4-nitrophenolhydrogenationoverAu@HMSM1.IntroductionTheAu@HMSMyolk-shellcatalystisexpectedtoexploretheoriginofAucatalysis.TheimpactofthesizeoftheAucorecatalytichydrogenation1.2.Experimental1.ImmobilizationofDispersedAuNanoparticlesonPS-co-P4VPCore-ShellMicrospheres.2.SynthesisoftheAu@HMSMYolk-ShellMicrospheresandHMSMMicrospheres.3.GeneralProceduresforCatalyticReductionof4-Nitrophenol.4.Characterization.ResultsAndDiscussion1.SynthesisandCharacterizationoftheAu@HMSMYolk-ShellCatalyst.2.CatalysisoftheAu@HMSMYolk-ShellMicrospheres.TEMA、BAu/PS-co-P4VP）C、DAu/PS-co-P4VP@HMSME、F、G、I、Au@HMSMyolk-shellHHMSMshellXRDB:Au/PS-co-P4VP@HMSMmicrospheresC:Au@HMSMyolk-shellmicrospheresA:Au/PS-co-P4VPmicrospheresUV-visspectrafortrackingthesynthesisoftheAu@HMSMyolk-shellmicrospheresA:Au/PS-co-P4VPmicrospheresB:Au/PS-co-P4VP@HMSMmicrospheresC:Au@HMSMyolk-shellmicrospheresXPSspectrafortrackingthesynthesisoftheAu@HMSMyolk-shellmicrospheresAu@HMSMyolk-shellmicrospheresAu/PS-co-P4VP@HMSMmicrospheresAu/PS-co-P4VPmicrospheresBrunauer-Emmett-Teller(BET)analysisoftheHMSMmicrospheresN2adsorption-desorptionisothermsandmesoporesizedistribution(inset)oftheHMSMmicrospheresTime-dependentconversionof4-nitrophenolcatalyzedbytheAu@HMSMyolk-shellcatalystcontainingacoreof50,40,29,and21nmAunanoparticles.50nm40nm29nm21nmCatalysisoftheAu@HMSMyolk-shellmicrospheresinthereductionof4-nitrophenolSuccessiveUV-visabsorptionspectraofthereductionof4-nitrophenolcatalyzedbytheAu@HMSMyolk-shellmicrospherescontaininga21nmAunanoparticlecore.Thesize-dependentTOFvalue(o)andinhibitionperiodξ(￭)oftheAunanoparticlecoreoftheAu@HMSMyolk-shellcatalystConclusionThesmallerthesizeoftheAunanoparticlecoreoftheAu@HMSMyolk-shellcatalyst,thefastertheconversionof4-nitrophenolandthehigherthevalueofturnoverfrequency.thesynthesizedAu@HMSMyolk-shellcatalystshowsaninterestingsize-dependentinhibitionandisusefultoexploretheAucatalysisorigin.1.2.