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《CeO2-TiO2催化剂低温NH3选择性催化还原NO的影响.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24卷第5期化学研究与应用Vo1.24,No.52012年5月ChemicalResearchandApplicationMay,2012文章编号:1004—1656(2012)05-0705-05焙烧温度对Mn—Fe/CeO2一TiO2催化剂低温NH3选择性催化还原NO的影响吴大旺,张秋林,林涛,龚茂初,陈耀强(1.黔南民族师范学院化学与化工系,贵州都匀558000;2.四川大学绿色化学与技术教育部重点实验室,四川成都610064)摘要:采用等体积浸渍法制备了Mn-Fe/CeO:-TiO:催化剂,考察了不同焙烧温度对其NH,选择性催化
2、还原(SCR)NO活性及催化剂性能的影响。并用N:吸附.脱附,X射线衍射(XRD)和x射线光电子能谱(xPs)等手段对催化剂进行了表征。活性结果表明,随着焙烧温度的升高,Mn—Fe/CeO:-TiO催化剂的催化活性先升高后降低。其中焙烧温度为500℃时Mn/CeO:-TiO:的NH,-SCR活性最佳,该催化剂在113—250℃之间表现出了良好NO去除效率。表征结果表明,500℃焙烧时,催化剂中Fe和Mn物种在CeO2"TiO:表面的分散效果最好。500℃焙烧时Mn-Fe/CeO2一TiO2表面Mn以+4价存在,Fe以+3、+2价存在,而c
3、e以+4、+3存在。关键词:焙烧温度;选择性催化还原(sea);氮氧化物中图分类号:0643文献标识码:A-EffectofcalcinationtemperatureonperformanceofMn—Fe/CeO2-TiO2catalystforselectivecatalyticreductionofNObyNH3atlowtemperatureWUDa-wang,,ZHANGQiu-lin,LINTao,GONGMao—chu,CHENYao—qiang‘(1.ChemistryandChemicalEngineeringDepa
4、rtment,QiannanNormalUniversity,Duyun558000,China;2.ThekeylaboratoryofGreenChemistry&Technology(SiehuanUniversity),MinistryofEducation,Chengdu610064,China)Abstract:TheMn—Fe/CeO2-TiO2catalystwaspreparedbytheincipientwetnessmethod,theinfluenceofcalcinationtemperatureonthepro
5、pertyandcatalyticactivityofMn-Fe/CeO2-TiO2Wasstudiedforselectivecatalyticreduction(SCR)ofNObyNH3.Thecata-lyst~werecharacterizedbyN2-adsorption-desorption.X—raydiffractionandX-rayphotoelectronspectroscopy.Theperformancere-suitsshowedthatthecatalyticactivitieswerefirstincre
6、asedandsubsequentlydecreasedwiththeincreaseofcalcinationtempera-ture.Thecatalystcalcinedat5oo℃showedthebestactivityforNOreductionbyNH3,andthiscatalystexhibitedhighNOconver-sioninawidetemperaturerangeofI13-250~(2.ThecharacterizationresultsrevealedthattheMn-Fe/CeO2-TiO2cata
7、lystcalcinedat500℃promotedthedispersionofMnandFespeciesonCeO,.TiO,.TheXPSresultsindicatedthattheMnspecieswasexistedinavalence0f+4.FespeciesWasexistedasamixedvalenceof+3and+2andCespecieswasamixedvalenceofexistedas+4and+3.Keywords:calcinationtemperature;selectivecatalyticre
8、duction(SCR);nitrogenoxides化石燃料的燃烧是产生大气污染物NO(NO,NO是一种技术成熟且应用广泛的脱硝技术。近NO)的主要原因。氨选择催化还原(NH3-SCR)年来
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