Catalytic oxidation of CO on LaMn 1−x Fe x O 3 perovskites solid solution

•LaMn1−xFexO3 perovskites were prepared by co-precipitation and rotor-vapor citrate method.•LaMn1−xFexO3 series prepared by rotor-vapor citrate method showed highest activity due to highest BET surface area.•The highest dispersion of Mn4+-O-Fe3+ species on the surface of LaMn0.4Fe0.6O3 show the lowest apparent activation energy (Ea) towards the oxidation of CO.