锰酸镧钙钛矿型复合氧化物的制备、表征及应用研究

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1、中国石油大学（华东）硕士学位论文锰酸镧钙钛矿型复合氧化物的制备、表征及应用研究姓名：王科申请学位级别：硕士专业：工业催化指导教师：钱岭20090601Preparation，CharacterizationandApplicationofLaMn03Perovskite—typeOxidesWangKe(IndustrialCatalysis)DirectedbyQianLing(AssociateProfessor)AbstractInthispaper,AB03perovskite—typeoxidesweresynthesizedbysolidstatereactionmethod

2、andsol。gelmethod，andtheeffectsofmodificationbyA-siteandB·siteion—dopingforthestructureandcatalyticperformancewerealsoinvestigated．StructureandreductionabilityofthematerialwerecharacterizedbyX—raydiffraction(XRD)，BET,temperatureprogrammedreduction(H2一TPR)．Theactivityforremovingsootinthe02atmospher

3、ewasinvestigatedbytemperatureprogrammedoxidation(TPO)．ThecatalyticperformancefordecomposingN20andsimultaneouslyremovingsootandNOxWasstudiedbyself-madeexperimentaldevice．TheLaMn03perovskite—typeoxideswerepreparedbysolidstatereactionmethodandsol-gelmethodandtheconditionswereoptimized．Othermetalions

4、weretentativelysubstitutedintotheA／Bsitesofperovskite-typeoxidesanditwasfoundthatthedopingionscouldenterthelatticesiteswhileinlowloading．TheresultsofTPOshowedthattheperovskite—typeoxidescouldobviouslydecreasethecombustiontemperatureofsoot．TheappropriatemetalionsweredopedintotheA—siteandB—sitelatt

5、iceoftheperovskite—typeoxidesandthecatalyticperformanceWasimproved．HE—TPRresultsshowedthatthecontentandtheactivityofactiveoxygeninthemodifiedperovskite-typeoxideswereimproved．TheevaluationresultsofdecomposingN20showedthatforthecatalystssynthesizedbythesolidstatereactionmethod，thecatalyticperforma

6、ncefordecomposingN20wereimprovedsli曲tlybydopinginA—siteonlyandtheinitialN20decompositiontemperaturewereraisedbydopinginB··siteandA／B-·siteofthecatalysts；forthecatalystssynthesizedbytllesol—gelmethod，thecatalyticperformancefordecomposingN20directlywereimprovedbydopingKandCeintheA-siteofLaMn03separ

7、atelyorsimultaneously．Atthesametime，theevaluationresultsofsimultaneouslyremovingsootandNOxinthedieselexhaustshowedthattheLaMn03preparedbysolidstatereactionmethodandsol—gelmethodcouldgreatlylowerthecombustiontemperature