La0.85K0.15CoO3perovskite-tpye catalyst was prepared by a sol-gel method and characterized by catalytic activity analysis to study the effect of NO and O2on the combustion of soot. The catalytic activity of La0.85K0.15CoO3Catalyst was promoted with NO. No matter lean or rich oxygen conditions, the La0.85K0.15CoO3catalyst could ignite soot at low temperature. The results of XRD and FT-IR showed that La0.85K0.15CoO3catalyst has the desired perovskite-type structure, ABO3.

To study the effect of K and Mn substitution on simultaneous removal of NOx and particulate materials (PM), a series of La1-xKxCo1-yMnyO3 (x, y=0.1, 0.2, 0.3, 0.4, 0.5) perovskite-type catalysts were synthesized by complex-combustion method. The catalytic performances of the catalysts were evaluated by temperature-programmed oxidation reaction (TPO). And the catalysts were characterized by XRD, FT-IR, H2-TPR techniques. After introducing K and Mn to LaCoO3 simultaneously, all the samples possess perovskite-type structures and the B-site ions form higher average oxidation state enhancing the catalytic performance obviously. La0.8K0.2Co0.7Mn0.3O3 catalyst exhibits not only the lowest T i(297 °C) temperature but also the lowest Tm (343 °C) temperature. Meanwhile, the NO reduction percentage over this catalyst can reach 97%.