Enhancing sulfur resistance of oxides in carbon monoxide oxidation by a high‐entropy‐stabilized strategy

Abstract Industrial chemical processes require sulfur‐resistant catalysts, which reduce catalyst replacement costs and simplify process operations. Herein, a high‐entropy‐stabilized strategy was put forward for sulfur‐resistant catalysis. A spinel high entropy (Zn 0.2 Mg 0.2 Cu 0.2 Mn 0.2 Co 0.2 Al 2 O 4 ) was introduced by ball milling process with aluminum isopropoxide as the main precursor. Zn 0.2 Mg 0.2 Cu 0.2 Mn 0.2 Co 0.2 Al 2 O 4 possessed a high surface area of 171.2 m 2 g −1 , higher than typical high‐entropy oxides (HEOs). The high‐entropy spinel catalyst exhibited better SO 2 ‐resistance performance in the oxidation of carbon monoxide, better than the simple oxides. The SO 2 ‐resistance of Zn 0.2 Mg 0.2 Cu 0.2 Mn 0.2 Co 0.2 Al 2 O 4 was primarily improved by reinforcing the stability of the oxide using a high‐entropy structure to decrease the absorption of SO 2 on its surface. Any adsorbed SO 2 on the surface of the HEO was then selectively trapped by sacrificial metal ions with stronger electron‐withdrawing ability, protecting the active center (Cu 2+ , Co 2+ ) from poisoning. This work reveals the significance of high‐entropy structures in sulfur resistance.