Ozone catalytic oxidation of toluene over triple perovskite-type catalysts modified with KMnO4

A unique triple perovskite-type catalyst was successfully synthesized using the simple sol-gel approach, and surface acid modification was added to improve the ozone catalytic oxidation (OZCO) process ability to remove toluene more effectively. Our study indicates that La3MnCuNiO9 catalyst treated with KMnO4 shows the best toluene oxidation activity. At 250 degrees C, the rates of conversion and mineralization were 100% and 83%, respectively, under thermal catalytic system when C7H8 concentration = 500 ppm. During the OZCO system ([ C7H8] = 20 ppm, O-3/C7H8=8; room temperature), for 6 h, the conversion rate remained at 100%. The high ratios of Mn4+/( Mn4++Mn3+), Cu2+, and abundant surface oxygen species, high specific surface area, and pore volume lead to remarkable catalytic performance of this catalyst. Meanwhile, the catalyst contributes to superior stability and water resistance. The catalytic mechanism of La3MnCuNiO9 after KMnO4 treatment in the context of OZCO was further discussed. Overall, after KMnO4 treatment, the La3MnCuNiO9 catalyst reveals extraordinary catalytic activity and excellent stability combination of this catalyst with ozone exhibits high toluene removal efficiency in the OZCO system and has a good potential for industrial applications.

Automated summary

A unique triple perovskite-type catalyst was synthesized using the sol-gel approach and acid modification, which showed excellent activity in the removal of toluene in the ozone catalytic oxidation process. The La3MnCuNiO9 catalyst treated with KMnO4 exhibited the highest toluene oxidation activity, with a conversion rate of 100% and mineralization rate of 83% at 250 degrees C. The catalyst had a high Mn4+/(Mn4++Mn3+) ratio, abundant surface oxygen species, high specific surface area, and pore volume, leading to remarkable catalytic performance and stability.