| 초록 |
Owing to its excellent redox chemistry and oxygen storage capacity, ceria (CeO2) plays an inportant role as an active support of heterogeneous catalyst for many applications, such as three-way catalysts (TWC), oxidation of CO, NO and hydrocarbons, low-temperature water gas shift (WGS) reaction, steam reforming of biooil, etc. Intensive research efforts have been made to understand its redox property and improve catalytic properties. Ceria increases catalytic activity by participating in redox step. It is also well known that the morphology of ceria affects its catalytic properties. The combined efforts of density functional theory and experiments for understanding the origin of facet effects on catalytic properties clearly have shown superior activity of (100) facet due to its higher reducibility and oxygen storage capacity. Here, Pd/CeO2(100) and Pd/CeO2(111) are compared to understand facet-sensitive CO interaction responsible for O22- and O2- formation. |
