Simultaneous Removal of NO_x and PM over La_(1-x)K_xCo_(1-y)MnyO_3 Perovskite-Type Catalysts

摘要

To study the effect of K and Mn substitution on simultaneous removal of NO_x and particulate materials (PM), a series of La_(1-x)K_xCo_(1-y)MnyO_3 (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 LaCoO_3 simultaneously, all the samples possess perovskite-type structures and the B-site ions form higher average oxidation state enhancing the catalytic performance obviously. La_(0.8)K_(0.2)Co_(0.7)Mn_(0.3)O_3 catalyst exhibits not only the lowest T_i(297 °C) temperature but also the lowest T_m (343 °C) temperature. Meanwhile, the NO reduction percentage over this catalyst can reach 97%.