Patent ID: 6616904
Filing Date: 2003-09-09
Classification: B01D,B01J

Abstract:
A method of removing the nitrogen oxides in exhaust gases, comprising contacting an exhaust gas with a material comprising an ilmenite structure of the formula ABO3, comprising at least one metal cation (A) and at least one metal cation (B) selected from the group consisting of the elements of groups IA, IIA, IIIB, IVB, VB, VIB, VIIB, VIII, IB, IIB, IIIA, IVA and VA, said cations (A) and (B) each being coordinated by 6 oxygen atoms and the ratio of the cationic radius of (A) to the cationic radius of (B) being equal to 1Â±0.4, so as to adsorb nitrogen oxides at a first temperature between 50Â° C. and 400Â° C., and desorbing nitrogen oxides from the material.