Simultaneous catalytic removal of NOx and diesel soot particulates over La1−xCexNiO3 perovskite oxide catalysts

Abstract A series of the La 1− x Ce x NiO 3 (0 ⩽  x  ⩽ 0.05) perovskite catalysts for simultaneous removal of nitrogen oxides and diesel soot were prepared by the citric acid complexation. The catalysts were characterized by X-ray diffraction, H 2 temperature programmed reduction and X-ray photoelectron spectroscopy. The catalytic performances of these catalysts were investigated by the temperature programmed reaction. The results indicated that Ni 2+ was the active centers. The partial substitution of Ce for La increased the concentration of Ni 2+ , enhancing the catalytic activities. The La 0.97 Ce 0.03 NiO 3 catalyst showed the highest activity. The maximum productivity of N 2 and the ignition temperature were 11.8% and 300 °C, respectively.