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ID:28874084
大小:10.59 MB
页数:106页
时间:2018-12-14
《制备方法 过渡金属掺杂对pdcza催化剂三效性能影响的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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.
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