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时间:2020-03-26
《CexTi1-xO2负载锰基催化剂的制备及其低温NH3选择催化还原NO.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第27卷第1期无机化学学报Vo1.27No.12011年1月CHINESEJOURNALOFINORGANICCHEMISTRY53.6OCexTil_xO2负载锰基催化剂的制备及其低温NH3选择催化还原NO吴大旺12张秋林2林涛2龚茂初陈耀强0(黔南民族师范学院化学与化工系,都匀558000)f2四川大学化学学院。绿色化学与技术教育部重点实验室,成都610064)摘要:用共沉淀法制备了Ce0复合氧化物载体。XRD和低温N吸附一脱附结果指出,当0.2≤≤0.4时,Cri0载体主要以无定形态存在,且Ce。rinO的比表面积
2、和孔容最大。Mn.Fe/Ce~Ti。02系列催化剂低温NH3选择性催化还原(SCR)N0活性结果表明,Mn—Fe/Ce,2的活性随着Ce含量的增加先增大后减小,其中Mn.Fe/Ce4Ti6()的活性最佳,在41000h空速下,催化剂在75℃起燃.NO转化率在113℃时即超过90%。而XRD和XPS分析结果指出,MnFe/Ceo.4Tio,602催化剂主要以无定形或微晶的形式存在.催化剂表面Mn和Fe与载体间存在强相互作用.且催化剂表面存在Ce,+/Ce“氧化还原电对和较多的化学吸附氧.有利于NO氧化成NO,同时催化剂表现
3、出了较好的抗H0和S0性能。关键词:低温;选择性催~(SCR);氮氧化物;氨;铈中图分类号:O614.33~2;0614.41l;0614.71l;0613.61文献标识码:A文章编号:1001—4861(2011)01—0053—08Ce~Ti1O2SupportedManganese-BasedCatalyst:PreparationandCatalyticPerformanceforSelectiveReductionofNOwithHa3atLowerTemperatureWUDa.Wang’ZHANGQiu—L
4、inLINTaoGONGMao-ChuCHENYao—Qiang,fDepartmentofChemistryandChemicalEngineering,QiannanNormalUniversity,Duyun,Guizhou558000,China)f2KeyLaboratoryofGreenChemistry&Technology,MinistryofEducation,SichuanUniversity,Chen~u610064,China)Abstract:TheCe102complexoxideswerep
5、reparedbyCO—precipitationmethod.TheXRDandlowtemperatureN2adsorptiondesorptionresultsshowthattheCeil02existsinamorphousformwhenisintherangeof0.2≤≤0.4,andtheCein6O2hasthelargestsurfaceareaandporevolume.TheactivityresultsofNH3selectivecatalyticreductionfSCR)ofNOatlo
6、wertemperatureindicatethattheactivityofMn—Fe/Ce~Ti102catalystsincreasesatthebeginningandthendecreaseswiththeincreaseofCe,andtheactivityofMn—Fe/Ceo.4Ti002isthebestatthespace.6velocityof41000h~.thelight.0fftemperatureisat75oC.andtheNOconversionexceeds90%at1l3℃.TheX
7、RDandXPSresultsshowthattheMn-Fe/Ceo4Tin602mainlyexistsasamorphousormicrocrystallineform,andthereis.stronginteractionbetweenthesurfaceMnandFeofMn—Fe/Cen4Tin602anditssupport.ThesurfaceofMn-Fe/Ce04Ti0602hasCeYCe“redoxcoupleandmorechemisorbedoxygencomparedwithMn-Fe/T
8、iO2,whichisbeneficialtotheoxidationofN0toNO2.TheMn—Fe/Ce0l4TiO2alsoexhibitsexcellentresistancetoH2OandSO2.Keywords:Lowtemperature;selectivecatalyticreduction(S
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