Effect of Ordered Arrangement of Ce and Zr Ions on Oxygen Storage Capacity of Ceria-Zirconia Solid Solution

Abstract

The CeO₂-ZrO₂ solid solution is the most important oxygen storage/release material for use in automobile catalysts. In particular, the ceria-zirconia solid solution with a pyrochlore structure exhibits the highest oxygen storage capacity (OSC). In this study, CeO₂-ZrO₂ solid solutions containing Y₂O₃ were synthesized and their OSCs were measured to clarify the influence of an ordered arrangement of Ce and Zr ions on the OSC. As a result of this study, it is concluded that an ordered arrangement of Ce and Zr ions markedly improves the OSC of CeO₂-ZrO₂ solid solutions.