Inorganic mixed oxide and catalyst for purification of...

C - Chemistry – Metallurgy – 01 – G

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C01G 25/00 (2006.01) B01D 53/94 (2006.01) B01J 23/63 (2006.01) B01J 32/00 (2006.01) C01B 3/40 (2006.01)

Patent

CA 2703881

A particulate inorganic mixed oxide comprising: aluminum; zirconium; cerium; and first and second additional elements each selected from the group consisting of rare earth elements other than cerium and alkaline earth elements, wherein a content of aluminum in the inorganic mixed oxide is 60 to 90 at%, in terms of element content, relative to a total amount of elements which form cations in the inorganic mixed oxide; a content of cerium in the inorganic mixed oxide is 0.4 to 50 at%, in terms of element content, relative to a total amount of zirconium and cerium in the inorganic mixed oxide; a content of a total amount of the first and second additional elements is 1 to 12 at%, in terms of element content, relative to the total amount of the elements which form cations in the inorganic mixed oxide; at least 80% of primary particles of the inorganic mixed oxide have a particle diameter of 100 nm or less; at least a part of the primary particles have an enriched surface region where a content of the second additional element is locally increased in a surface layer portion thereof; and an amount of the second additional element in the enriched surface region is 0.1 to 0.95% by mass, in terms of oxide, relative to a whole amount of the inorganic mixed oxide.

L'invention concerne un oxyde inorganique mixte particulaire contenant de l'aluminium, du zirconium, du cérium, et un premier et un second élément additionnels qui sont respectivement choisis dans l'ensemble constitué des éléments de terres rares à l'exception du cérium, et dans l'ensemble constitué des éléments alcalino-terreux ; la teneur en aluminium dans l'oxyde mixte est de 60 à 90 % atomiques d'élément, rapporté à la quantité totale des éléments qui sont convertis en cations dans l'oxyde mixte ; la teneur en cérium dans l'oxyde mixte est de 0,4 à 50 % atomiques d'élément, rapporté à la quantité totale de zirconium et de cérium contenus dans l'oxyde mixte ; la teneur totale en premier et en second élément additionnels est de 1 à 12 % atomiques d'élément, rapporté à la quantité totale d'éléments qui sont convertis en cations dans l'oxyde mixte ; au moins 80 % des particules primaires de l'oxyde mixte ont un diamètre de particule inférieur ou égal à 100 nm ; au moins une partie des particules primaires comporte, sur les surfaces, des zones enrichies dans lesquelles la teneur en second élément additionnel est localement accrue ; et la quantité du second élément additionnel contenu dans les zones enrichies est de 0,1 à 0,95 % en masse d'oxyde, rapporté à la quantité totale d'oxyde mixte.

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