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Catalytic oxidation can efficiently eliminate nitrogen-containing volatile organic compounds (NVOCs) and suppress the generation of toxic NO  x  in order to avoid secondary pollution. In this study, mesoporous SiO 2 -confined LaMnO 3 perovskite nanoparticles with high dispersion were successfully prepared by a citric acid-assisted deposition method (LMO/SiO 2 -SD) and tested for the oxidation of n -butylamine. The method utilized the synergistic effect of abundant active hydroxyl groups existing on the SiO 2 gel surface and citric acid, rendering the metal ions more uniformly scattered on the SiO 2 surface. Strikingly, the LMO/SiO 2 -SD sample exhibited the optimum catalytic performance ( T  90 at 246 °C) and the highest N 2 selectivity, which was mainly ascribed to its abundant surface acid sites, superior low-temperature reducibility and higher ratio of surface Mn 4+ species. The apparent activation energy ( E  a ) for n -butylamine oxidation over LMO/SiO 2 -SD sample was 29.0 kJ mol -1 . Furthermore, the reaction mechanism of n -butylamine oxidation was investigated by in situ FITR and a reasonable reaction route for n -butylamine oxidation over the LMO/SiO 2 -SD sample was proposed.

rsc advances

A citric acid-assisted deposition strategy to synthesize mesoporous SiO2-confined highly dispersed LaMnO3 perovskite nanoparticles for n-butylamine catalytic oxidation