NITROGEN OXIDE DECOMPOSING CATALYST AND DENITRATION METHOD USING THE SAME.

摘要

This invention aims at providing a novel NOx decomposing catalyst and a denitration method using the same, and the characteristics of the invention reside in an NOx decomposing catalyst in which vanadium oxide is supported on anatase type titanium oxide having a specific surface area of 100-250 m<2>/g and not less than 0.05 cc/g each of micropores of diameters of 15-25 ANGSTROM and 75-85 ANGSTROM , and an exhaust gas denitration method in which an NOx-containing exhaust gas is treated by bringing the same gas into contact with the above-mentioned catalyst at a temperature in the range of 100-350 DEG C in the presence of a reducing gas. An NOx-containing exhaust gas with which a catalyst-poisoning substance, such as water and SOx coexists can be treated efficiently at a comparatively low temperature of not higher than 170 DEG C, at which a practical treatment for the exhaust gas cannot be conducted in a conventional method of this kind, without causing N2O to be byproduced. <IMAGE>