Simultaneous catalytic removal of NOx and diesel soot particulates over La2 − xAxNi1 − yByO4 perovskite-type oxides

Abstract A series of La 2 −  x A x B x Ni 1 −  x O 4 (A = Sr, Ba; B = Mn, Fe, x  = 0, 0.2) complex oxides for simultaneous removal of nitrogen oxides and diesel soot were prepared by the citric acid complexation. The catalysts were characterized by XRD, XPS, H 2 -TPR, NO-TPD and catalytic activity measurements. According to these investigations, we found that the A 2 BO 4 -style catalyst containing Ni had excellent catalytic performance at low temperature. The oxygen had great influence on the target reaction. B-site would mainly influence the reaction temperature range; A-site would mainly control the selectivity of the reaction. The La 1.8 Sr 0.2 NiO 4 catalyst showed the best activity, and the yield of N 2 is up to 72% just at 300 °C.