Nitrogen oxide storage material and nitrogen oxide storing catalyst prepared therefrom

A nitrogen oxide storage material, comprising:

• at least one storage component for nitrogen oxides selected from the group consisting of particles of an oxide, carbonate and hydroxide of magnesium, calcium, strontium, barium, potassium or cesium, the particles having a mean particle diameter of less than 1 μm;
• and
• a support material, on which the storage component is provided, consisting of doped cerium oxide, which has been doped with 0.5 to 20 wt. % of at least one oxide of an element selected from the group consisting of silicon, scandium, yttrium, the rare earth metals, and mixtures thereof, with respect to the total weight of storage material.

A nitrogen oxide storage material, comprising:

• at least one storage component for nitrogen oxides selected from the group consisting of particles of an oxide, carbonate and hydroxide of magnesium, calcium, strontium, barium, potassium or cesium, the particles having a mean particle diameter of less than 1 μm;
• and
• a support material, on which the storage component is provided, consisting of a cerium/zirconium mixed oxide having a zirconium oxide content of from 1 to 25 wt. %, with respect to the total weight of the mixed oxide.