Performance of NO Reduction by Reburning Assisted by Iron Wire

Abstract

NO could be reduced by CH4, CO and H2 in the reburning process. In this paper, the reduction of NO by CH4, CO and H2 was investigated when assisted by iron wire and its oxides. In a temperature range of 600-800℃, it was observed that iron had little catalytic effect for the reduction of NOx by CH4 and H2, but CO presented better reduction performance by the catalytic assistance of iron. In the absence of O2, iron shows a weak catalytic effect for the reduction of NOx by CO at 600-700℃ and a strong catalytic effect at 800℃. O2 gave a great inhibition for NOx reduction by CO over iron. The following catalytic activity order of iron and its oxides was observed: FexOy<Fe<Fe (after oxidation/reduction pretreatment).