K–Mn supported on three-dimensionally ordered macroporous La0.8Ce0.2FeO3 catalysts for the catalytic combustion of soot

Abstract

Three-dimensionally ordered macroporous (3DOM) La0.8Ce0.2FeO3 perovskite was successfully constructed through a colloidal crystal template way. And the K–Mn/3DOM La0.8Ce0.2FeO3 catalyst was obtained by an incipient-wetness impregnation method. The physicochemical characterizations of the material were conducted by means of XRD, FESEM, TEM, N2 adsorption–desorption, H2-TPR, XPS and O2-TPD techniques, and the catalytic performance was evaluated for soot removal. The intact well-ordered macroporous skeleton was remained after K and Mn were loaded, which offered an ideal environment for soot combustion. The generated K2Mn4O8 was well decorated on the skeleton of the 3DOM perovskite, which could increase the concentration of surface oxygen species and enhance the reducibility of catalyst. The as-prepared catalyst exhibited good catalytic performance for soot removal, and could lower the T50 of soot to 377°C.