Mn/Co Redox Cycle Promoted Catalytic Performance of Mesoporous SiO2-Confined Highly Dispersed LaMn(x)Co(1-x)O(3)Perovskite Oxides in n-Butylamine Combustion

摘要

abstract_textpIn this study, highly-dispersed perovskite-type oxides LaMn(x)Co(1-x)O(3)supported on mesoporous SiO2(LMxC1-xO/SiO2) were synthesized by a citric acid-assisted deposition method. For LMxC1-xO/SiO(2)catalysts, the double B-site transition metal ions can not only significantly arise the surface defects, but also lead to the formation of (Mn3++Co3+)/(Co2++Mn4+) redox cycle, both of which were able to improve the catalytic performance of LMxC1-xO/SiO(2)in n-butylamine combustion. Strikingly, LM0.2C0.8O/SiO(2)catalyst showed the optimum catalytic performance (T-90=210 degrees C at a space velocity of 15,000 mL g(cat)(-1) h(-1)) and the lowest NO(x)yield among the LMxC1-xO/SiO(2)samples, which could be greatly assigned to the accelerated activation and circulation of the oxygen species initiated by the surface defects and redox cycle./p/abstract_text