| 초록 |
N2O has a high global warming potential (GWP) which is 310 times higher than that of CO2. Therefore it is required to abate N2O in aerosphere. It is reported that Co3O4 is active for direct N2O decomposition owing to its relatively high redox properties, and oxygen storage capacity (OSC) of ceria (CeO2) improves thermal stability. Cobalt spinel, however, which was prepared by precipitation was significantly inhibited by O2, H2O at low temperature (＜400℃). To improve catalytic activity at low temperature (＜400°C), researchers added alkali and alkaline earth metals on cobalt spinel. This study investigated cobalt spinel based catalysts prepared by a co-precipitation and incipient wetness impregnation method. These catalysts especially doped potassium showed high activities in the presence of O2 and H2O. The activity of potassium doped catalysts exhibited significantly improved catalytic performance while the activity of CeO2 combined Co3O4 was slightly higher than that of Co3O4 at the low temperatures (＜ 400°C). To demonstrate the relationship between catalytic performance and redox ability, the prepared catalysts were characterized by XRD, BET, H2-TPR, O2-TPD and XPS. |
