Co₃O₄-modified 3DOM LaFe_0.6Mg_0.4O₃ perovskite as robust catalysts for soot oxidation

In this study, 3DOM LaFe_0.6Mg_0.4O₃ perovskite was prepared using a colloidal crystal template technique and subsequently decorated with Co₃O₄ for soot combustion. The results indicated that the LaFe_0.6Mg_0.4O₃ perovskite with three-dimensional ordered macropores structure could facilitate the dispersion of Co₃O₄, boost the number of active sites for soot combustion, and significantly enhance the contact efficiency between the catalyst and soot. The interaction between Co₃O₄ and perovskite created additional oxygen vacancies and enhanced the redox ability of the catalysts. Meanwhile, the presence of Co₃O₄ facilitated the adsorption and activation of O₂, which could accelerate the oxidation of soot particles. Notably, the 2.5 %Co/LaFe_0.6Mg_0.4O₃ catalyst exhibited the highest performance, achieving a T₅₀ of 407 °C for soot combustion in the presence of 500 ppm NO and 5 % O₂. The catalyst also demonstrated excellent stability and water resistance, making it a promising candidate for practical applications.