Catalysts with the loading of cerium oxide on activated carbon prepared by impregnation were used for the selective catalytic reduction (SCR) of NO with C3H6 by temperature programmed reaction (TPR). The different loading of cerium oxides and calcination temperature was investigated, respectively. The catalysts were characterized by N2-specific surface area measurement (BET), X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), scanning electron microscope (SEM). The results indicated that cerium oxide supported on activated carbon is highly dispersed. The specific surface area of activated carbon decreases with the increase of the loading of cerium oxide, but the NO conversion increases with the increase of the loading of cerium oxide. Ce(0.07)/AC-400 can keep the NO conversion above 70% between 270 ℃ to 330 ℃. It is benefit to NO reduction by getting a better balance between the loading amount and dispersion of cerium oxides on AC. The calcination temperature is important to the conversion of precursor, but the higher temperature may destroy the structure of AC. It was indicated that the catalyst which is calcined at 400 ℃ can achieve wider temperature window.
