| The Pt-Rh-Pd/CeO2-La2O3/Al2O3 catalysts were prepared with method of co-impregnation, and characterized by X-ray diffraction (XRD). Its catalytic activities were evaluated by gas mixing test system. The results of orthogonal experimentsshowed that the best catalyst formula is Pt-Rh-Pd 0.1%, CeO2 5%, La2O3 4% to the oxidation of carbon monoxide, while to the reduction of NO, the best catalyst formula is Pt-Rh-Pd 0.1%, CeO2 4%, La2O3 4%. Rare earth oxides (La2O3, CeO2) as co-catalyst, only can improve catalytic ability of Pt-Rh-Pd/CeO2-La2O3/Al2O3, but do not play critical roles. |
