Nitrogen oxides (NOx) storage catalyst

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A catalyst for storing nitrogen oxides (NOx) in exhaust gas from a lean burn engine comprises a NOx storage material and a substrate, wherein the NOx storage material comprises a NOx storage component and a NO oxidation promoter on a support material, wherein the NO oxidation promoter is manganese or oxide, hydroxide or carbonate thereof. The storage material may comprise a mixed oxide of magnesium oxide and aluminium oxide. The NOx storage component may comprise : an oxide, carbonate or hydroxide of an alkali metal; and oxide, carbonate or hydroxide of an alkaline earth metal; and/or an oxide, carbonate or hydroxide of a rare earth metal, preferably the NOx storage component comprises an oxide, carbonate or hydroxide of barium.