Novel synthesis of Pd-CeMnO3 perovskite based on unique ultrasonic intervention from combination of Sol-Gel and impregnation method for low temperature efficient oxidation of benzene vapour

Abstract

The 0.5 wt% Pd-CeMnO₃ was prepared by ultrasonic intervention combination of Sol-Gel and PVA-protected N₂ bubbling NaBH₄ reduction impregnation method, then it was used for the catalytic oxidation of benzene vapour at low temperatures. By analyzing the removal and mineralization rate at different temperatures, it was found that 50% of benzene was degraded in 145 °C, then 90% of benzene was degraded in 186 °C, 100% of mineralization rate was 220 °C. After ultrasonic treatment, 64% removal rate and 46% mineralization rate could be increased, it proved that ultrasonic treatment can improve the performance of catalyst significantly. According to XRD spectrum, ultrasonic intervention helped to stabilize the crystalline structure of perovskite. Further, SEM pictures intuitively proved that ultrasonic treatment contributes to the formation of surface pore structure of catalyst. Moreover, diagram of H₂-TPR indicates that ultrasonic intervention makes the catalyst have more cryogenic activity sites for strong low temperature catalytic activities. All these reasons are assumed to be the factors that lead to superior performance of the catalyst.

Keywords: Benzene; CeMnO(3) perovskite; Low temperature oxidation; Pd; Ultrasonic intervention.