制备方法 过渡金属掺杂对pdcza催化剂三效性能影响的研究

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1、摘要关键词:三效催化剂，过渡金属，铺错固熔体，热稳定性，汽车尾气净化V摘要AbstractTheproblemofpollutantsemittedbyvehicleshavereceivedthewidespreadattentioninthesociety．Theapplicationofcatalyticinverttechniqueisthemosteffectivemethodtorealizeautomotiveeahaustpurification(overEuro—IVstandard)．Highperformanc

2、ethuliummodifiedaluminamaterial(ACZO)isthepivotalcomponentinthecatalystsofautomotiveexhaustpurification，andithasbeenappliedinpractice．Astheredoxreactionofthreewaycatalystmainlytakeplaceinthecatalysts’surface，thehighsurfaceandhighthermalstabilityofhighperformanceACZOmat

3、erialisthepreconditionofhighoxygen-storagecapacity．Recentlytosatisfythecatalyst’Scold—startingperformance，catalyticinvertinstrumentisneartotheventoftheengineduringpraticalapplication．Thismeasureneedstohavebetterperformanceofhighthermalstabilityandlargesurfacearea．7-A12

4、03isoneofsupportsofthecatalystswhicharethemostfar—rangingapplication．Buttheproblemofthermalstabilityof7一A1203isalong—termone，whichpeopleispuzzled，especiallyintheatmosphereofhightemperatureandvapourbeingpresentat．A1203iseasytotakeplacephasetransitionandsinter，anditevolv

5、estoct-phasebeingsteadyinthermodynamicsandlargeparticlecausingadrasticdecreaseinthesurfacearea．Thisisoneofimportantreasonswhichcontributetothethermaldeactivationofthecatalysts．Therefore，investigationandexploitationofnewthuliummodifiedaluminamaterialwithhighthermalstabi

6、lityandhighsurfaceareahasimportantlyacademicandpracticalsignificanceforimprovingdurabilityandcold—startingperformanceofthree-waycatalystsforautomotiveexhaustpurification．Inthiswork，theeffectsofpreparedmethod，transitionmetals(Cr、Mn、Fe、CoandNi)，preparationconditiononCZAm

7、aterialandtheeffectofcatalystsarediscussedindetail．TheCZAsupportsaresynthesizedbyfivedifferentmethods，whichareSol—gel，coprecipitation，Citricacid，MicroemulsionandImpregnationmethods．ThePd／CZAcatalystsaretestedforexhaustpollutionpurification．Effectsoftransitionmetals(Cr，

8、Mn，Fe，CoandNi)andpreparationconditiononexhaustVI摘要pollutiondestructionoverPd／CZAandPd／CZA-Nicatalystshavebeenstudied．