| abstract |
A poisonous gas removing agent used for removing a poisonous gas such as CO, NOx and O3 contained in ventilated exhaust gases from motor tunnels, underground parking and the like to prevent atmospheric pollution, capable of solving problems of the prior art indicated with respect to adsorbents and catalysts used for removal of the poisonous gas, efficiently removing NOx without beforehand adding O3 to a gas being treated, at the time of adsorbing and removing NOx in the gas being treated, sustaining an excellent removal activity even in high humidity regions at the time of removing CO and O3, and being readily and repeatedly used through hot air regeneration effected at relatively low temperatures, and hardly being subjected to poisoning by SOx contained in the gas being treated. The poisonous gas removing agent contains as effective components an Mn oxide having a specified Mn oxidation number, a composite Mn-Cu oxide or a composite Mn-Fe oxide and an Ru compound, or in addition thereto alkali metal compounds. |