Carbon-based catalyst for flue gas desulfurization and method of producing the same and use thereof for removing mercury in flue gas

A carbon-based catalyst for flue gas desulfurization that is brought into contact with a flue gas containing at least SO2 gas, oxygen and water vapor so that the SO2 gas can react with the oxygen and the water vapor to form sulfuric acid which is to be recovered,

• wherein, on a surface of the carbon-based catalyst, iodine, bromine or a compound thereof is added, ion exchanged or supported and a water-repellent treatment is applied to the carbon-base catalyst,
• wherein the carbon-based catalyst contains a resin having a contact angle with water of 90° or more as a result of the water repellent treatment,
• wherein, after a carbon-based catalyst is moistened to clog the inside of pores thereof with water, a solution containing iodine, bromine or a compound thereof is sprayed or sprinkled to the carbon-based catalyst or the carbon-based catalyst is dipped in the solution to add, ion exchange or support iodine, bromine or a compound thereof on a surface of the carbon-based catalyst, the carbon-based catalyst being moistened in such a way that the carbon-based catalyst and water are put in a vessel and the inside of the vessel is depressurized and, after maintaining the state for a certain time, is returned to atmospheric pressure, or that a mixed gas of water vapor and air is allowed to flow through the carbon-based catalyst to condense the water vapor.