VERFAHREN ZUM ENTFERNEN VON STICKSTOFFOXIDEN UND SCHWEFELOXIDEN AUS EINEM ABGAS

摘要

1. A process of removing nitrogen oxides (NOx ) and sulfur oxides from an exhaust gas which contains nitrogen and water vapor and which at temperatures of 40 to 120 degrees C is contacted with activated alumina and activated carbon as catalysts, wherein the alumina mainly combines with the nitrogen oxides, the activated carbon removes the sulfur oxides and combines with them to form sulfuric acid, and a reducing gas is used to regenerate the laden catalysts, characterized in that the exhaust gas is first conducted over activated alumina to substantially remove the nitrogen oxides and to remove a part of the sulfur oxides at the same time, the partly purified exhaust gas, which contains oxygen and water vapor, is subsequently conducted over the actived carbon, the laden alumina is regenerated in an AL2 O3 regenerator and separately thereform the laden activated carbon is regenerated in an activated carbon regenerator, the activated carbon regenerator is supplied with hydrogen-containing reducing gas, the sulfur and the sulfur-containing compounds are removed from the activated carbon at a maximum temperature of 400 to 550 degrees C, a reducing gas which contains sulfur compounds is withdrawn from the activated carbon regenerator and is fed to the Al2 O3 regenerator, the reducing gas which contains sulfur compounds is used at maximum temperatures of 200 to 400 degrees C to reduce the loading of the alumina to form sulfur and nitrogen and to desorb the loading, and a sulfur-containing desorption gas is discharged.