Study on N2O Catalytic Decomposition and Reaction Kinetics over Composite Metal Oxides of Ce–Cu/Co/Al2O3

A series of catalysts of Co/Al2O3, Cu/Co/Al2O3, and Ce–Cu/Co/Al2O3 have been prepared by impregnation method in this study. The experimental results showed that the activity of Cu/Co/Al2O3 on N2O decomposition was increased significantly with the increase of Cu/Co mass ratio. The activity of catalytic N2O decomposition was optimal when the Cu/Co mass ratio was 0.6 under experimental conditions used. On this basis, a series of catalysts of Ce–Cu/Co/Al2O3 were prepared. H2-TPR results indicated that the temperature of low and high-temperature reduction peaks of Ce–Cu/Co/Al2O3 was relatively decreased by about 20 and 80°C compared with the sample of Cu/Co/Al2O3, respectively. The experimental results showed that the activity of Ce–Cu/Co/Al2O3 on N2O decomposition was increased with increasing the mass ratio of Ce/Cu, while the catalytic activity on decomposition of N2O was best when the mass ratio of Ce/Cu was reached to 1.2. Furthermore, the catalyst of Ru/Ce–Cu/Co/Al2O3 was prepared by programmed-impregnation method. XRD characterization results over Ce–Cu/Co/Al2O3 and Ru/Ce–Cu/Co/Al2O3 samples showed that the structure of the two catalysts was basically similar before and after Ru doped. The experimental data showed that the Ru/Ce–Cu/Co/Al2O3 catalyst had better N2O decomposition performance. Stability test showed that it had good low-temperature activity and stability, which provided the basis for further related research.