Engineering Cu-Ce@Al2O3 core-shell catalyst for the efficient simultaneous catalytic removal of COS and H2S

The sulfur content of blast furnace gas has an impact on its utilization, which makes the deep desulfurization of blast furnace gas a necessity. In the present study, aluminum-based core-shell microsphere catalysts were synthesized using aqueous method for catalytic removal of COS and H 2 S. The Cu-Ce@Al 2 O 3 is more conducive to the generation of oxygen vacancies. The distinctive core-shell configuration presents a multitude of active sites, thereby reducing the competitive adsorption of H 2 S and COS on the catalyst surface. The presence of Cu 2+ species is of particular significance, as it serves to facilitate the hydrolysis of COS and the simultaneous removal of H 2 S. The Ce 3+ species facilitates the oxidation of the S species, thereby enhancing the desulfurization effect. The Al 2 O 3 protective shell prevents the Cu-Ce active component from being covered by sulfur deposition, thereby maintaining its reactivity. The addition of Al 2 O 3 as a shell can enhance the alkalinity of the catalyst, facilitating the adsorption of COS and H 2 S on the surface and, in turn, improving the catalyst's reaction activity. The core-shell structure proved more conducive to promoting the redox capacity of Cu + /Cu 2+ and Ce 4+ /Ce 3+ . CuO (110) represents the primary active center of the COS hydrolysis reaction, yet it also leads to over-oxidation of H 2 S. In contrast, CeO 2 was conductive to the formation of HSCOOH and S 0 . CuO, on the other hand, was favorable to the dissociation of HSCOOH and the oxidation of S 0 .