abstract |
A enhances the performance of the O 2 storage, to improve the low-temperature activity of the three-way catalyst. In a three-way catalyst containing a catalyst metal and an O 2 storage material, as an O 2 storage material, ABO 3 (where A is La and Sr, and B is at least one of Fe and Co) Is used.) A perovskite-type double oxide represented by the formula: [Selection diagram] FIG. |