DESULFURIZATION OF EXHAUST GASES USING ACTIVATED CARBON CATALYST

摘要

Intended is to improve the activity and stability of an activated carbon catalyst for use in recovering and removing sulfur oxides contained in exhaust gases as sulfuric acid using a catalytic oxidation. An activated carbon is mixed with a fluororesin and the resultant mixture is kneaded with application of a shearing force, and is molded into a given shape such as a granule, a plate or a cylinder, to thereby impart water repellency to the surface of the wall of a gap formed between activated carbon particles. When exhaust gases are flowed through a tower packed with this catalyst, it is preferred that the gases are flowed downwards, and that use is made of an activated carbon catalyst formed into a honeycomb shape which is composed of planes parallel to the direction of a gas flow mentioned above. Introduction of dilute sulfuric acid or water from the top of the tower to wash the surface of the activated carbon catalyst is effective for maintaining high activity and allows a catalyst layer to avoid closing or being contaminated even when exhaust gases contain dust.