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1、物理化學學報(WuliHuaxueXuebao)3002ActaPhys.鄄Chim.Sin.,2010,26(11):3002-3008November[Article]www.whxb.pku.edu.cn石墨烯負載Pt催化劑的催化氧化發(fā)光性能1,2111,*吳小琴宗瑞隆牟豪杰朱永法(1清華大學化學系,北京100084;2南昌航空大學環(huán)境與化學工程學院,南昌330063)摘要:利用溶膠固定化工藝合成了石墨烯負載Pt納米顆粒的Pt/石墨烯催化劑.研究了分散在石墨烯上的Pt顆粒尺寸和負載量對CO催化發(fā)光性能的影響規(guī)律,探查了催化劑的某些分析特性及對其它氣相體系的催化氧化
2、性能.結(jié)果表明,Pt納米顆??梢院芎玫胤稚⒃谑┍砻?并有較快的催化反應速率,Pt顆粒越小催化發(fā)光強度越大.當不同Pt負載量(0.4%-1.6%(w,質(zhì)量分數(shù)))的催化劑作用于40%(漬,體積分數(shù))以下濃度的CO/空氣體系時,產(chǎn)生的催化發(fā)光強度均與CO濃度成正比,其中以負載量0.8%最優(yōu);但隨CO濃度繼續(xù)增加,低Pt負載量(0.4%,0.8%)催化劑的發(fā)光強度下降,而高Pt負載量(1.2%,1.6%)催化劑的發(fā)光強度繼續(xù)上升,且Pt負載量越高,催化氧化發(fā)光能力越強.該催化劑在一定條件下,不但對CO氧化有較好的催化發(fā)光性能,還對乙醚、無水甲醇和甲苯有不同程度的催化氧化發(fā)
3、光活性;但二氧化碳、甲醛、戊二醛、丙酮、乙酸乙酯、三氯甲烷、水蒸氣均無響應信號.關(guān)鍵詞:石墨烯;Pt納米顆粒;催化氧化發(fā)光;一氧化碳;Pt負載量中圖分類號:O646CataluminescencePerformanceonCatalystsofGrapheneSupportedPlatinum1,2111,*WUXiao鄄QinZONGRui鄄LongMUHao鄄JieZHUYong鄄Fa(1DepartmentofChemistry,TsinghuaUniversity,Beijing100084,P.R.China;2CollegeofEnvironmentalan
4、dChemicalEngineering,NanchangHangkongUniversity,Nanchang330063,P.R.China)Abstract:Platinumnanoparticlessupportedbygraphenewerepreparedbythecolloiddepositionprocess.Theeffectsofparticlesizeandloadingamountofplatinumparticlesonthecataluminescence(CTL)propertiesofCOhavebeeninvestigated.TheC
5、TLpropertiesandsomeanalysischaracteristicsofthecatalystonothergasphasesystemswereexplored.TheresultsshowthatthePtnanoparticlesarewelldistributedongrapheneandafastercatalyticreactionrateisapparent.ThesmallerparticlesleadtoahigherCTLintensity.WhenthevolumeconcentrationofCOinairisbelow40%(漬
6、,volumefraction)theCTLintensityisproportionaltotheconcentrationofCOforallthecatalysts(0.4%-1.6%(w,massfraction)Pt).Amongthem,thecatalystcontaining0.8%Ptwasfoundtobethebest.However,byincreasingtheCOconcentrationtheCTLintensityofthecatalystswithalowPtloading(0.4%,0.8%)decreasedwhilethehigh
7、lyloaded(1.2%,1.6%)catalystscontinuedtoincreasetheirintensity.Moreover,ahigherPtloadingledtoahigherCTLintensity.UndercertainconditionsthecatalystshowsgoodCTLperformanceforCOoxidation,andether,methanolaswellastolueneshowdifferentdegreesofresponse.Noresponsewasobtainedforca