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Thermally stable CeO2/ZrO2 oxygen storage materials [1, 2, 3, 4, 5, 6 and 7] are necessary to get advanced TWC catalysts complying with the more severe regulations. In addition to the thermal stability, the increase of the bulk oxygen mobility of the CeO2/ZrO2 mixed oxides is of great interest to boost the conversion of the pollutants under transient modes and during the cold start operations as well. This paper deals with the recent progress achieved in the preparation of thermo-stable highly reducible mixed oxides. Thanks to a new process, with mild conditions, Rhodia developed new CeO2/ZrO2 mixed oxides with outstanding oxygen availability as well as high surface area over the whole composition range [5]. These materials show a pure solid solution and a BET surface area higher than 20 m2/g after air ageing at 1100°C.