Constructing oxygen vacancy-enriched Fe3O4@MnO2 core–shell nanoplates for highly efficient catalytic oxidation of H2S in blast furnace gas

Abstract

The rational design of catalyst structures holds paramount significance for realizing efficient catalytic reactions. In this study, an Fe3O4@MnO2 core–shell catalyst was successfully synthesized using a facile one-pot method and applied in the selective oxidation of H2S in blast furnace gas. The introduction of the MnO2 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 H2S oxidation. Experimental results revealed that the Fe3O4@MnO2 catalyst (Fe/Mn = 4:1) displayed 100 % H2S conversion and 95.7 % sulfur selectivity at 150 °C in a humid gas stream containing O2 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.