铁掺杂铈基复合氧化物CO催化还原NO的性能研究  

Cerium-based Composite Oxides Doped with Iron and Its Catalytic Performance for NO Reduction by CO

作　　者：徐亚欣 杨劲萱 马艺芯 戚瑞 龚志军[1,2,3] Xu Yaxin;Yang Jinxuan;Ma Yixin;Qi Rui;Gong Zhijun(School of Energy and En-vironment,Inner Mongolia University of Science and Technology,Baotou 014010,China;Key Laboratory of Efficient and Clean Combustion,Baotou 014010,China;Collaborative Innovation Center of Integrated Exploitation of Baiyun Ob Multi-Metal Resources,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010 [2]内蒙古自治区高效洁净燃烧重点实验室,内蒙古包头014010 [3]白云鄂博共伴生矿资源高效综合利用省部共建协同创新中心,内蒙古包头014010

出　　处：《中国稀土学报》2024年第1期40-46,I0002,共8页Journal of the Chinese Society of Rare Earths

基　　金：内蒙古自然科学基金项目(2019ZD13/2020MS05045)资助。

摘　　要：采用浸渍法、水热法和微波加热法制备铁掺杂的铈基复合氧化物催化剂,研究温度、铈铁摩尔比、制备方法对铈基复合氧化物的催化还原性能的影响,并且使用BET,NO-TPD,H_(2)-TPR,XRD,Raman等对催化剂进行表征分析。结果表明:随着温度的升高,NO转化率是一个先不断增加后趋于稳定的过程;无论是浸渍法、水热法还是微波加热法,最佳铈铁摩尔比均为10∶2;3种制备方法的催化活性顺序:微波加热法>水热法>浸渍法。微波加热法制备的铈基复合氧化物催化剂在500℃的脱硝率为76%,脱硝率在700℃达到99%。通过XRD和Raman表征说明Fe^(3+)取代Ce^(94+)进入到CeO_(2)晶格中,改变CeO_(2)的萤石结构,增加氧空位,造成晶格畸变。Ce-based composite oxides doped with iron were prepared by impregnation method,hydrothermal method and microwave heating method.The effects of temperature,cerium-iron molar ratio and preparation method on the catalytic reduction performance of Ce-based composite oxides were investigated.The catalysts were characterized by BET,NO-TPD,H_(2)-TPR,XRD and Raman.The results show that with the increase of temperature,the NO conversion rate is a process of increasing first and then becoming stable.The best molar ratio of cerium to iron is 10∶2 by impregnation method,hydrothermal method and microwave heating method.The order of catalytic activity of the three preparation methods is microwave heating method>hydrothermal method>impregnation method.The denitrification rate of cerium based composite oxide catalyst prepared by microwave heating method is 76% at 500 ℃ and 99% at 700 ℃.XRD and Raman characterizations show that Fe^(3+) replaces Ce^(4+) into the CeO_(2) lattice,changes the fluorite structure of CeO_(2),increases oxygen vacancy,resulting in lattice distortion.

关 键 词：铈基复合氧化物 NO转化 CO催化还原 

分 类 号：TQ133.3[化学工程—无机化工]