Process for removing nitrogen oxides

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Eliminating nitrogen oxides from vehicle exhaust fumes comprises a material of cryptomelan, hollandite, romanechite or todorkite microporous structure comprising MO6 octahedra containing an element (M) from group IIIB, IVB, VB, VIB, VIIB, VIII, IB, IIB and IIIA and a second element (B) from alkali(ne earth), rare earth, transition and group IIIA and IVA elements.