Oxygen storage material, process for its preparation and its application in a catalyst

A process for producing an oxygen storage material comprising cerium oxide and at least one second oxide of a metal M1, the process comprising the steps of:

• a) mixing an aqueous solution of a cerium oxide precursor with an aqueous solution of a precursor of an oxide of a metal M1 selected from the group consisting of an alkaline earth metal, rare earth metal, zirconium, zinc, cobalt, copper and manganese to form a mixture;
• b) adding a first precipitation agent to the mixture, to form an aqueous suspension containing a precipitate, wherein the cerium oxide and the oxide of the metal M1 form Ce/M1 mixed oxide particles, and
• c) separating the precipitate from the suspension, drying and calcining the precipitate.

23-24. (canceled)