| 摘要 |
<p>A zirconium-cerium composite oxide having excellent heat resistance and being capable of maintaining its large specific surface area even when used under high-temperature conditions, which composite oxide contains zirconium and cerium at a weight ratio of 51 to 95 : 49 to 5 in terms of zirconium oxide and ceric oxide, the composite oxide having a specific surface area of not smaller than 50 m<2>/g, wherein said composite oxide is capable of maintaining a specific surface area of not smaller than 20 m<2>/g even after heating at 1100 DEG C for 6 hours, a method for preparing the same, and a co-catalyst for purifying exhaust gas prepared with the composite oxide. <IMAGE></p> |
