CLEANING METHOD OF EXHAUST GAS

摘要

PROBLEM TO BE SOLVED: To provide a method for removing nitrogen oxides by which nitrogen oxides can be efficiently reduced and removed from a combustion exhaust gas containing water, sulfur oxides and oxygen in a larger amt. than the stoichiometric amt. to the unburned component such as carbon monoxide, hydrogen, hydrocarbons. SOLUTION: A purifying material for an exhaust gas prepared by depositing silver and a silver compd. on a porous inorg. oxide is disposed in a piping for an exhaust gas. The exhaust gas to which hydrogen and one of hydrocarbons and oxygen-contg. org. compds. are added in the upstream side of the removing material is brought into contact with the purifying material at 200 to 550 deg.C to remove nitrogen oxides.