镧钴钙钛矿催化剂制备及去除氮氧化物和碳烟性能研究

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1、天津大学博士学位论文镧钴钙钛矿催化剂制备及去除氮氧化物和碳烟性能研究姓名：姚文生申请学位级别：博士专业：工业催化指导教师：王日杰20090601ABSTRACTAnumberofcatalystsbasedonthelanthanumcobaltiteperovskitetypeoxideswerepreparedbysolutioncombustionsynthesisorcitricacidcomplexation．ThecatalystswerecharacterizedusingXRD，FT

2、-11LH2-TPRXPS，BET,SEM-EDSandTEM．nlecatalyticactivitiessimultaneouslyremovedSOOtandNOxwereevaluatedusingatechniqueoftemperatureprogrammedreaction(TPR)underthemodeleddieselengineexhaustcircumstance．Firstly,theLat．xKxC003(x20．--0．5)perovskite·typeoxideswe

3、repreparedbysolutioncombustionsynthesis．1heresultsshowedthatallpreparedcatalystspossessedAB03perovskite-typestructures．withporoussponge—likestructure，correspondingtoarhombohedralsystem．FortheLal．xKxC003catalysts，sincethepartialsubstitutionofKforLaatA-s

4、iteresultedintheincreaseofoxygenvacancyandC03+．C04+system，itenhancedthecatalyticperformance．Lao7K0．3C003catalystwiththehighestcatalyticactivitywasobserved，and．themaximumNOconversionintoN2andtheignitiontemperatureofsootwere27．5％and2620C，respectively．Sec

5、ondly,anumberofnan-perovskitecatalystsLaC01．xPdx03(x=0一'0．03)werepreparedviasolutioncombustionsynthesis．ThenoblemetalPdintheformofPd3+orPd4十wassuccessfullydepositedontotheLaC003perovskitelattices，leadingtoimprovethecatalyticperformancesignificantly．The

6、maximumNOconversionintoN2andthetemperatureofwere32．8％and2650C．respectively．Thirdly,thenovelLal．xMexCol-yPdy03(Me=K，Sr,Cex=0，0．2问，0．05)catalystswithAB03-typestructurewerepreparedusingthecitricacidcomplexation．FortheLaC003catalyst，thepartialsubstitutiono

7、fKorSratA-siteenhancingthecatalyticperformancewasfound，whilenoimprovethecatalyticactivityfromtheCe-substitutedcatalystswasobserved．Moreover,thecatalyticactivitiesofallthePd·substitutedcatalystfurtherincreasedandLao．sSro2Coo．95Pdo0503showedthehighestact

8、ivity．ThemaximumconversionofnitrogenoxidetoN2andtheignitiontemperaturewere31．6％and2580C．respectively．Finally,Effectsofreactionconditionsoncatalyticperformance，includingconcentrationsof02andtotalflowrate，wereinvestigatedoverthreecatalyst