Novel zirconia ceria compositions

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 35/486 (2006.01) B01J 21/06 (2006.01) B01J 35/10 (2006.01) C01G 25/02 (2006.01) C04B 35/632 (2006.01)

Patent

CA 2751471

Composition in the form of a solid-solid solution which is phase stable at 1150°C / 36 hours and at 1200°/ 4 hours and which exhibits a thermal stability in surface area of at least 15 m2/g after treatment at 1100°C / 4 hours, the composition comprising oxides of zirconium and cerium wherein the oxide of zirconium is enriched, an oxide of erbium, gadolinium, dysprosium, or yttrium as a stabilizer in an amount of 10% to 30% by weight, and optionally one ore more dopant, the use of such composition in a system for exhaust gas after treatment, a process which is appropriate for the preparation of such composition and compositions obtainable by such process.

La présente invention concerne une composition sous la forme d'une solution solide-solide dont la phase est stable à 1 150 °C / 36 heures et à 1 200 °C / 4 heures et qui présente une stabilité thermique en ce qui concerne la surface spécifique d'au moins 15 m2/g après traitement à 1 100 °C / 4 heures. Ladite composition comprend des oxydes de zirconium et de cérium, l'oxyde de zirconium étant enrichi, un oxyde d'erbium, de gadolinium, de dysprosium, ou d'yttrium comme stabilisant en une quantité allant de 10 % à 30 % en poids, et éventuellement un ou plusieurs éléments dopants. L'invention concerne également l'utilisation d'une telle composition dans un système pour gaz d'échappement après traitement, un procédé qui est approprié pour la préparation d'une telle composition et des compositions pouvant être obtenues par un tel procédé.

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