Removal of nitrogen oxides from gaseous mixtures using aqueous alkaline manganate or permanganate solutions

摘要

Nitrogen oxides in a gaseous mixture are removed therefrom by a removal method which comprises causing the gaseous mixture to contact an absorbent comprising a manganate or a permanganate or a manganese-containing substance, which forms a manganate or a permanganate at the time of use, oxidizing manganese oxides formed at the treatment by the reduction of the manganate or permanganate with the nitrogen oxides, thereby to generate the oxy-acid salt of manganese, and circulating the same.