Abstract
Delafossite-type CuLnO 2 (Ln = La, Y) was synthesized and investigated their oxygen storage capacity (OSC) under oxidation/reduction cycle. CuLaO 2 was synthesized by heating at 1000 °C for 6 h in N 2 flow and CuYO 2 was synthesized by heating of Cu 2Y 2O 5 at 1190 °C for 1 h in N 2 flow. The oxygen storage capacity values of CuLaO 2 and CuYO 2 at lower temperature were larger than that of CeO 2-based materials which is used as a promoter of an automobile catalyst. The stability of delafossite-type CuLnO 2 under cyclic oxidation/reduction atomosphere was investigated using XRD analysis. During the OSC measurement up to 700 °C, CuLaO 2 decomposed to La 2CuO 4 and Cu 2O. CuYO 2 also partially decomposed to Y 2O 3, Cu 2Y 2O 5 and Cu 2O. These results suggest that oxidative decomposition of CuLnO 2 occurred at high temperature. In lower temperature range, delafossite-type CuLaO 2+ x containing excess oxygen existed in both oxidative and reductive atmosphere and it partially decomposed during a hundred of oxidation/reduction cycles.
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