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Presently, the treatment of four-way catalysts is important for reducing pollutant emissions from diesel engine exhaust, which is a major cause of urban haze. In this study, we prepared perovskite-type catalysts via the citric acid sol-gel method. Experiment results showed that K substitution at site A in LaMnO 3 decreased the agglomeration of the catalysts effectively, increased the contact with the reaction gas, promoted the conversion of Mn 3+ → Mn 4+ , and reduced the ignition temperature of soot. Ce substitution at the B-site in La 0.5 K 0.5 MnO 3 produced a CeO 2 phase and decreased the Mn 4+ /Mn 3+ ratio to 0.49, which is conducive to improving the catalytic oxidation performance. The K and Ce co-doping had the best activation effect, which showed a low activation energy (10.87 KJ mol -1 ) and a high simultaneous removal rate of NO  x  (reaching 90% at 275 °C) and soot ignition at 250 °C under lean conditions.

Efficient Catalysts of K and Ce Co-Doped LaMnO3 for NOx–Soot Simultaneous Removal and Reaction Kinetics

Efficient Catalysts of K and Ce Co-Doped LaMnO₃ for NO_x–Soot Simultaneous Removal and Reaction Kinetics