Abstract:Spinel oxides, e.g., NiCo2O4, are a promising catalyst for oxidation of toluene. The NiCo2O4 spinel with high active oxygen conversion rate was prepared by Ce doping, and the Ce/NiCo2O4 catalyst was successfully prepared by hydrothermal method. The catalyst was characterized by H2 temperature-programmed reduction (H2-TPR),X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), specific surface area measurement (BET), and transmission electron microscopy (TEM). The doping amount was changed to investigate the effect on catalytic oxidation performance. When the toluene concentration was 2538 ppm, the space velocity was 10000 h-1, and the catalyst volume was 0.5 mL, the 15% Ce/NiCo2O4 catalyst preparing by once- hydrothermal possessed the optimal performance (T99=267°C) and there was no significant change in catalyst performance after catalytic oxidation at 267 °C for 72 h. The mechanism research showed that Ce-doped NiCo2O4 spinel can increase the amount of the high valence metal, which can promote the generation rate of active oxygen and further improve the catalytic performance of the catalyst.