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a b s t r a c tA multifunctional catalyst/storage material has been prepared to maximize NO x removal. This material is based on mixed oxides derived from modified layered double hydrotalcites (LDH). A cobalt catalytic function oxidizes the NO to NO 2 . The NO 2 is stored as nitrate in the basic sites of the material. The basic properties of the Co/Mg/Al mixed oxide derived from LDH were enhanced by doping with sodium, improving the storage capacity of the catalyst. Finally, the introduction of vanadium sites, enables the reduction-decomposition of the nitrates. This multisite catalyst/storage material results in a well equilibrate formulation that maximizes catalyst conversion and regenerability.