Patent ID: 6641789
Filing Date: 2003-11-04
Classification: B01D,B01J

Abstract:
A process for decomposing nitrogen (II) oxide or a mixture containing nitrogen (II) oxide and/or a nitrogen oxide of nitrogen oxidation state greater than 2 contained in an effluent composition which process comprises the steps of:(a) passing the effluent composition through a first reaction chamber where the effluent composition is contacted with oxygen in the presence of an oxidation catalyst at a temperature range of from 200 to 800Â° C. and at least a proportion of the nitrogen (II) oxide is oxidized to a nitrogen oxide having a nitrogen oxidation state of greater than 2; and (b) thereafter passing said effluent composition through a second reaction chamber where said oxidized effluent composition is contacted with an oxidisable material at a temperature in the range of from 100 to 1000Â° C., and reduces at least a portion of the nitrogen oxides having a nitrogen oxidation state of greater than 2 to produce molecular nitrogen and a reduceable oxide of said oxidation material; and wherein an electromotive force is applied across the oxidation catalyst when the effluent composition is passed through the first reaction chamber.