Patent ID: 7749455

Claim:
A COS treatment method for a gasified gas containing COS, H 2 S, H 2 O, O 2 , and CO, the method comprising: increasing an initial concentration of COS in the gas and decreasing concentrations of H 2 S, CO and O 2 in the gas by using an O 2 removal catalyst consisting of TiO 2 and Cr 2 O 3 or consisting of TiO 2 and NiO at a gas temperature of at least 300° C. to accelerate the following reaction: 2H 2 S+2CO+O 2 →2COS+2H 2 O; and after the increasing of the initial concentration of COS in the gas and the decreasing of the concentrations of H 2 S, CO and O 2 in the gas, decreasing the increased concentration of COS in the gas to a concentration lower than the initial concentration of COS in the gas by converting COS contained in the gas to H 2 S by using a COS conversion catalyst.