| 초록 |
A catalyst with excellent stability beyond simply high activity can be applied to various reactions. Therefore, we selected CeO2 with high oxygen storage capacity (OSC) and facile redox properties. The goal was accomplished by the co-substitution of rare earth metal (RE) and transition metal (TM). The role of RE dopant was proved to stabilize the catalyst surface, and TM dopant induced an increase in defect concentration by low vacancy formation energy (Evf). Consequently, despite the harsh condition for ~700 h (1 cycle: 900 °C, 24 h → cooling at room temperature → target °C, 24 h), the (RE, Cu)-DC proved a strong resistance to deactivation. This approach of ultra-stable catalyst will be able to overcome the problems facing deactivation in a variety of applications. |
