Research progress of carbonyl sulfide removal from blast furnace gas by porous materials

Blast furnace gas (BFG) is an important secondary energy by-product produced from the process of iron making in a blast furnace. Decreasing the amount of carbonyl sulfide (COS) in blast furnace gas can not only reduce equipment corrosion but also improve the environment. The porous materials, with a high surface area, unique micro/mesoporous, and designability, are considered to be suitable candidates for COS removal. Recently, the porous materials show excellent COS removal properties, benefiting from their high BET surface areas, large pore volumes, and high designability. In this review, we provide an overview of recent progress achieved in COS removal from BFG by the porous material via COS adsorption or hydrolysis. Diverse porous material design for improving COS removal performance and the corresponding structure-activity relationships are highlighted. Particular emphasis is placed on the role of COS adsorption and hydrolysis. Furthermore, the opportunities, challenges, and future prospects of the application of COS removal are also discussed.