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

A series of La2 − xAxBxNi1 − xO4 (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, H2-TPR, NO-TPD and catalytic activity measurements. According to these investigations, we found that the A2BO4-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 La1.8Sr0.2NiO4 catalyst showed the best activity, and the yield of N2 is up to 72% just at 300 °C.

Graphical AbstractPartial substitution of La by Sr on La2NiO4 has excellent performance in selective reductive reaction. The La1.8Sr0.2NiO4 has an obvious increase in PN2 from 45% to 71% just at 300 °C.Figure optionsDownload as PowerPoint slideResearch Highlights
► A2BO4-type oxide containing Ni as catalyst.
► Catalysts for simultaneous removal of NOx and diesel soot particulates.
► They have low N2 conversion temperature and high N2 yield.
► A-site mainly influences the selection of the reaction.
► B-site mainly influences the reaction temperature range.