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1、物理化學(xué)學(xué)~E(WuliHuaxueXuebao1JanuaryActaP.一Chim.Sin.,2011,27(1):169-176169[Article]www.whxb.pku.edu.cnSnO2負(fù)載Au和M-Au(M=Pt,Pd)催化劑及其低溫催化氧化CO性能葉青趙建生李冬輝趙俊程水源康天放(北京工業(yè)大學(xué)環(huán)境與能源工程學(xué)院環(huán)境科學(xué)系,北京100124)摘要:以SnO為載體,采用沉積沉淀法(DP)、共沉淀法(CP)和浸漬法(1M)制備了金負(fù)載Au/SnO催化劑,同時(shí)采用沉積沉淀法制備了M.Au/SnO(M=Pd,Pt)XI金屬負(fù)
2、載催化劑.通過(guò)X射線衍射(XRD)、BET比表面積測(cè)定、透射電鏡(TEM)和X射線光電子能譜(XPS)等技術(shù)對(duì)樣品進(jìn)行表征,并測(cè)定其對(duì)CO的催化活性.結(jié)果表明:與CP法和lM法相比,DP法制備的Au/SnO一DP催化劑,Au顆粒(<5nm)較小,分布均勻;Au/SnOz—DP中的Au是以金屬態(tài)Au。存在,而Au/SnO一CP和Au/SnO.IM中,金以Au。和Au”的混合價(jià)態(tài)存在,在Au/SnO。-DP和M—Au/SnO中的Au、Pt、Pd和SnO之問(wèn)存在相互作用:Au/SnO:-DP催化性能明顯優(yōu)于Au/SnO一CP和Au/SnO.I
3、M.Au與Pt和Pd的雙金屬?gòu)?fù)合催化劑催化活性明顯提高.不同方法制備Au/SnO催化活性的差別主要是由于Au顆粒大小和Au氧化態(tài)的不同而產(chǎn)生.而M—Au/SnO活性提高,可能是由于Au與Pl和Pd之間的相互作用.關(guān)鍵詞:Au/SnO:低溫催化氧化CO;制備方法:Au二元催化劑中圖分類號(hào):0643Au/SnO2andM-Au(M=Pt,Pd)/Sn02BimetallicCatalystsfortheLow·TemperatureCatalyticOxidationofCOYEQingZHAOJian—ShengLIDong—HuiZHA
4、OJunCHENGShui·-YuanKANGTian·-Fang(DepartmentofEnvironmentalScience,CollegeofEnvironmentalandEnergyEngineering,Beo'ingUniversityofTechnology,Beijing100124,PR.China)Abstract:Au/SnO2catalystswerepreparedbydeposition—precipitation(DP),co—precipitation(CP)andtypicalwetimpregn
5、ationmethods(iN).M(M=Pt,Pd)一promotedAu/SnO2catalystswerepreparedbytheDPmethod.ThesampleswerecharacterizedbyX.raydifraction(XRD),Brunaner—Emmett-TeIler(BET)adsorption,transmissionelectronmicroscopy(TEM),andX—rayphotoelectronspectroscopy(XPS)techniques.Theresultsshowedthat
6、comparedwithCPandlM.theDPmethodledtoafairlyuniformdispersionofgoldnanODarticleswithdiametersIessthan5nmandlargerspecificsurfacesfortheAu/SnO2catalyst.TheAulnAu/SnO2一DPwasmetallic(Au。)whileinAu/SnO2-CPandAu/SnO2-IMtheAuconsistedofamixtureofAu0andAu”.Theoxidationofcarbonmo
7、noxideovertheAu/SnO2.DPandM.promotedAu/SnO2.DPcatalystswereinvestigated.WeobservedthatthePd—orPt-dopingofAu/SnO2一DPresultedinasignificantincreaseinperformance.WeconcludethatthediferentactivitiesoftheAu/SnO2catalyststhatwerepreparedusingdiferentpreparationmethodsmaybeattr
8、ibutedtothesizeoftheAuparticlesandthestatesofgold.AremarkableimprovementincatalyticactivitybecauseofPdO