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时间:2020-03-26
《制备方法对Co-MOR催化剂CH4选择还原NO性能的影响.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、物理化学学~E(WuliHuaxueXuebao)JuneActa.一Chim.Sin.2013,29(6),1289-12961289[Article]doi:10.3866/PKU.WHXB201304162、,、,、)i,.whxb.pku.edu.cn制备方法对CO.MOR催化剂CH4选择还原NO。I生能的影响李滨王虹丁福臣’李翠清宋永吉’柯明任翠涛’(北京石油化工学院化学工程学院,北京102617;中国石油大学(北京)理学院,北京102249)摘要:采用离子交换法、浸渍法制备一系列的C
2、o.MOR催化剂,并将其用于CH选择性催化还原NO(CH.SCR)反应.运用X射线衍射(XRD)、X射线荧光光谱(XRF)、扫描电子显微镜(SEM)、紫外-拉曼(UV_Raman)光谱、X射线光电子能谱(XPS)、NO程序升温脱附(NO-TPD)等手段对催化剂进行了表征.结果表明,浸渍法制备的催化剂,Co以Co。O形式存在;而离子交换法制备的催化剂,Co以离子形式进入丝光沸~(MOR)骨架之中,在催化剂上形成更多的Co和【Co—O—Co],形成更均匀NO吸附中心和CH一SCR反应活性中心.催化剂
3、活性评价表明离子交换法制备的催化剂具有更宽的活性温度区间,Co(O.30)一MOR催化剂在327—450。C温度范围内NO转化率大于50%.关键词:Co;丝光沸石:离子交换:CH;NO中图分类号:0643EfectsofPreparationMethodsontheCatalyticPerformanceofSelectiveCatalyticReductionofNOwithCH4overCo·MORCatalystsLIBin’,WANGHong’’DINGFu—Chen’LICui-Qin
4、g’。SONGYong—Ji’KEMingRENCui—Tao’rDepartmentofChemicalEngineering,BeijingInstituteofPetrochemicalTechnology,Beijing102617,R.ChinaCollegeofScience,ChinaUniversityofPetroleum,Beijing102249,PR.China)Abstract:AseriesofCo-mordenite(MOR)catalystspreparedbyi
5、on-exchangeorimpregnationmethodswereusedintheselectivecatalyticreactionofNOwithmethane(CH4.SCR).ThestructureandphysicochemicaIpropertiesofthecatalystswereexaminedbyX-raydiffraction(XRD),X—rayfluorescence(XRF),scanningelectronmicroscopy(SEM),UV-Ramans
6、pectroscopy,X—rayphotoelectronspectroscopy(XPS),andtemperature—programmeddesorptionofNO(NO—TPD).TheCospeciesinthecatalystpreparedbyimpregnationispresentas00304,whereasinthecatalystpreparedbyanion—exchangemethod,theCospeciesenterinthemordeniteskeleton
7、withtheionform,andthemoreCoand『Co—O—Co]formedinthecatalysts。themoreuniformtheadsorptionofNOcentersandtheactivecentersofCH4.SCR.ThecatalystspreparedbydiferentmethodsexhibiteddiferentactivitiesforCH.SCR.Thecatalystspreparedbyion—exchangeexhibitedactivi
8、tyoverawideactivitytemperatureregion.andNOconversionwasover50%at327-450。ContheCo(0.30)一MORcatalyst.KeyWords:Co;Mordenite;Ion—exchange;OH4;NOReceived:February18,20l3;Revised:April15,2013;PublishedonWeb:April16,2013.Correspondingauthors.WANGHong.Email:
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