Preparation of a monolith MnOx–CeO2/La–Al2O3 catalyst and its properties for catalytic oxidation of toluene

Abstract

MnO_x–CeO₂/La–Al₂O₃ catalysts prepared by the deposition–precipitation method, impregnation method and a combination of the two methods were investigated for toluene oxidation. The results showed that the MnO_x–CeO₂/La–Al₂O₃ catalyst prepared by the deposition–precipitation method showed the best catalytic activity by achieving the complete conversion of toluene at 300 °C with a GHSV of 12 000 h⁻¹. N₂ adsorption–desorption, XRD, SEM-EDX, H₂-TPR, O₂-TPD, Toluene-TPD and XPS were employed for catalyst characterization. The characterization results revealed that the MnO_x–CeO₂/La–Al₂O₃ catalyst prepared by the deposition–precipitation method had richer surface oxygen species, a higher proportion of Mn⁴⁺ and good low-temperature redox properties, which resulted in a superior catalytic activity toward complete oxidation of toluene.