| 초록 |
The effect of ceria shape and Cu loading on the shaped support were investigated. Ceria and ceria based materials have important applications in fields such as oxidation catalysts, fuel cell electrolytes, etc. Particularly, Cu/CeO2 catalysts have been shown to be very active for CO oxidation. In this study, Cu/CeO2 catalysts were studied for preferential CO oxidation (PROX) reaction. We synthesized various shapes of ceria nanocrystals (-rods, -cubes, and -octahedra) by hydrothermal methods. Then, Cu with loading of 1 and 4 wt% were deposited on each shape of ceria. The morphology and activity of ceria catalysts were characterized by TEM, XPS, H2-TPR, CO-TPR, and Raman spectroscopy. Especially, the relative concentration of oxygen vacancies was confirmed by Raman spectroscopy for various shapes. And the catalysts were evaluated for the CO oxidation in presence of excess H2. The Cu/CeO2 catalysts were compared before and after reaction. |
