| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a zirconium-cerium-based compound oxide excellent in heat resistance, capable of maintaining a high specific surface area even in the case of use in a high-temperature environment and to provide a method capable of producing the compound oxide in excellent reproducibility and economically. SOLUTION: This zirconium-cerium-based compound oxide is a compound oxide baked at 500-1,000 deg.C, comprises zirconium and cerium, has the blending ratio of zirconium and cerium calculated as zirconium oxide and ceric oxide of (51-95):(45-5) by weight, shows at least 50m<2> /g specific surface area after baking at 500-1,000 deg.C, maintains at least 20m<2> /g specific surface area after heating at 1,100 deg.C for 6 hours and contains 0.1-20wt.% of the total calculated as oxide of at least one selected from the group consisting of yttrium, scandium, lanthanum, praseodymium, neodium, samarium, europium, gadolinium, magnesium, calcium, barium, aluminum, titanium and hafnium.</p> |
