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The redox behaviour of a Ce 0.68 Zr 0.32 O 2 mixed oxide is reversibly modified by alternating high temperature (1223 K) reduction with either mild (823 K) or high temperature (1223 K) re-oxidation treatments.

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On the basis of detailed previous knowledge about the correlation existing between the Oxygen Storage Capacity (OSC) of ceria-zirconia mixed oxides, the nature of redox pretreatments and the nanostructure of this family of complex materials, it has been possible to design a synthetic strategy allowing one to prepare ceria-zirconia and ceria-yttria-doped zirconia materials, with total ceria contents below 20%, featuring OSC values higher than those observed for catalysts which incorporate supported noble metal particles in their formulation, especially in the very low, 373-473 K, temperature range. These novel, noble-metal free and highly reducible, ceria-zirconia materials allow a much more efficient usage of ceria as a component of oxygen storage formulations, which is nowadays considered one of the key innovation targets in the field of lanthanide oxide based catalysts.