Constructing oxygen vacancy-enriched Fe 3 O 4 @MnO 2 core–shell nanoplates for highly efficient catalytic oxidation of H 2 S in blast furnace gas

The rational design of catalyst structures holds paramount significance for realizing efficient catalytic reactions. In this study, an Fe 3 O 4 @MnO 2 core–shell catalyst was successfully synthesized using a facile one-pot method and applied in the selective oxidation of H 2 S in blast furnace gas. The introduction of the MnO 2 shell suppressed the further growth and aggregation of Fe species, leading to outstanding catalytic stability. Simultaneously, abundant oxygen vacancies facilitated the adsorption and activation of oxygen, thereby enhancing H 2 S oxidation. Experimental results revealed that the Fe 3 O 4 @MnO 2 catalyst (Fe/Mn = 4:1) displayed 100 % H 2 S conversion and 95.7 % sulfur selectivity at 150 °C in a humid gas stream containing O 2 and CO. Remarkably, no discernible decline in catalytic activity was observed after 170 h of operation, indicating the promising industrial prospects of this catalyst. This study provides an effective strategy for designing efficient and stable desulfurization catalysts.