Patent ID: 6551564
Filing Date: 2003-04-22
Classification: B01D,B01J

Abstract:
A process for eliminating oxides of nitrogen from exhaust gases, from automotive vehicle internal combustion engines, comprising contacting the exhaust gases with a material selected from materials with a cryptomelane, hollandite, romanechite or todorkite structure, comprising MO6 octahedra connected together such that the structure generates micropores in the form of channels, said octahedra comprising at least one element M selected from the group consisting of elements from groups IIIB, IVB, VB, VIB, VIIB, VIII, IB, IIB and IIIA of the periodic table, said octahedra excluding tin, said material further comprising at least one element (B) selected from the group consisting of alkali-metal elements, alkaline-earth elements, rare earth elements, transition metals and elements from groups IIIA, IVA of the periodic table.