The selective catalytic reduction of NO over Ce 0.3 TiO x -supported metal oxide catalysts.

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 2wt.% Cd/Ce0.3TiOx catalyst exhibited the best NH3-SCR performance, with a wide temperature window of 250–450°C for NO conversion above 90%. Moreover, the catalyst showed N2 selectivity greater than 99% from 200 to 450°C.