Eliminating nitrogen oxides from ammonia combustion gases - by catalytically splitting ammonia and reducing nitrogen oxides in effluents

摘要

Nitrogen oxides are eliminated from gaseous effluents from internal combustion engines, or other devices using ammonia as a fuel, by passing the ammonia before the burning through a zone heated with effluent gases over an ammonia splitting catalyst and, after the burning, adding some ammonia to the effluent gases to reduce the nitrogen oxides over a catalyst. High degree of ammonia utilisation is achieved (40%). The effluent gases are adequately purified. The burning temp. should not exceed 1500 degrees C as otherwise excessive formation of nitrogen oxides takes place.