NOVEL ZIRCONIA CERIA COMPOSITIONS

摘要

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.