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发明公开
CN101842321A 无机混合氧化物和使用所述氧化物制得的用于排气净化的催化剂 失效 - 权利终止

无机混合氧化物和使用所述氧化物制得的用于排气净化的催化剂
摘要：
本发明提供一种粒子状无机混合氧化物，其含有铝，锆，铈，和分别选自除铈之外的稀土元素与碱土金属元素中的第一和第二添加元素，其中所述混合氧化物中铝的含量相对于所述混合氧化物中转化成阳离子的元素的总量以元素计为60～90原子％；所述混合氧化物中铈的含量相对于所述混合氧化物中所含有的锆和铈的总量以元素计为0.4～50原子％；所述第一和第二添加元素的总含量相对于所述混合氧化物中转化成阳离子的元素的总量以元素计为1～12原子％；所述混合氧化物的一次粒子中的至少80％具有100nm以下的粒径；所述一次粒子中的至少一部分具有富化的表面区域，其中在该富化的表面区域的表层部中所述第二添加元素的含量局部增加；以及在所述富化的表面区域中所述第二附加元素的含量相对于所述混合氧化物的总量按氧化物换算为0.1～0.95质量％。
摘要（英）：

A particulate inorganic mixed oxide containing aluminum, zirconium, cerium, and the first and second additional elements which are selected from the group consisting of rare earth elements except cerium and the group consisting of alkaline earth elements respectively, wherein the content of aluminum in the mixed oxide is 60 to 90at% in terms of element based on the total amount of elements which are converted into cations in the mixed oxide; the content of cerium in the mixed oxide is 0.4 to 50at% in terms of element based on the total amount of zirconium and cerium contained in the mixed oxide; the total content of the first and second additional elements is 1 to 12at% in terms of element based on the total amount of elements which are converted into cations in the mixed oxide; at least 80% of the primary particles of the mixed oxide have particle diameters of 100nm or below; at least part of the primary particles have, on the surfaces, enriched areas wherein the content of the second additional element is locally enhanced; and the amount of the second additional element contained in the enriched areas is 0.1 to 0.95mass% in terms of oxide based on the total amount of the mixed oxide.

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