| 摘要 |
PURPOSE:To provide a catalyst for removing nitrogen oxides and a method using it where nitrogen oxides are effectively removed from waste combustion gas contg. oxygen whose amount is not less than the theoretical reaction one to the unburnt content of nitrogen oxides, carbon monoxide, hydrocarbon, etc. CONSTITUTION:A catalyst for removing nitrogen oxides which (a) silver or silver oxide by 0.2-15wt.% (expressed in terms of silver element) and (b) at least one metal element selected from a group consisting of alkaline metal elements and alkaline earth metals by <=50wt.% of the carried quantity of silver components (expressed in terms of silver element) are deposited on 100wt.% of porous inorganic oxide to form is installed in mid-way of a waste gas conduit tube. And hydrocarbon or oxygen contg. organic compounds not more than five times the weight of nitrogen oxide in waste gas are added on tie upstream side of the catalyst and the waste gas comes into contact with the catalyst at 200-600 deg.C, causing nitrogen oxides to be removed by the reaction with hydrocarbon. |
