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A Ce0.3TiOx oxide carrier was synthesized via a sol-gel process,and Ce0.3TiOx supported metal (M =Cd,Mn,Fe,W,Mo) oxide catalysts were prepared by the method of incipient-wetness impregnation.The catalysts were characterized by means of X-ray diffraction (XRD),Brunauer-Emmett-Teller (BET) analysis,scanning electron microscopy (SEM),transmission electron microscopy (TEM),Fourier transform infrared (FT-IR) spectroscopy,UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS),and Temperature-programmed reduction with H2 (H2-TPR).The catalytic activities for de-NOx were evaluated by the NH3-SCR reaction.Among all the catalysts tested,the 2 wt.％ Cd/ Ce0.3TiOx catalyst exhibited the best NH3-SCR performance,with a wide temperature window of 250-450℃ for NO conversion above 90％.Moreover,the catalyst showed N2 selectivity greater than 99％ from 200 to 450℃.