Cerium-based Composite Oxides Doped with Iron and Its Catalytic Performance for NO Reduction by CO
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 meth-od on the catalytic reduction performance of Ce-based composite oxides were investigated.The catalysts were characterized by BET,NO-TPD,H2-TPR,XRD and Raman.The results show that with the increase of tempera-ture,the NO conversion rate is a process of increasing first and then becoming stable.The best molar ratio of ce-rium 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＞impregna-tion 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 Fe3+replaces Ce4+in-to the CeO2 lattice,changes the fluorite structure of CeO2,increases oxygen vacancy,resulting in lattice distor-tion.
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