Hexagonal manganese-based spinel nanosheets with unique interface for efficient catalytic oxidation of...

Chlorinated volatile organic compounds (CVOCs) pose a significant threat to both the atmospheric environment and human health. Although the catalytic combustion technique for effectively eliminate these pollutants, enhancing the catalytic efficiency and stability remains a significant challenge. This work reports a facile synthesis strategy of constructing cobalt (Co)-modified manganese-based spinel oxide catalyst with unique Mn₃O₄-Mn₅O₈ interface. The interface induces lattice distortion and generates oxygen vacancies, which effectively facilitate the formation and migration of reactive oxygen species, enhance the adsorption and activation capabilities for molecular oxygen, while simultaneously improving the catalyst's surface acidity and adsorption affinity for o-dichlorobenzene (o-DCB). Consequently, the synthesized Co-Mn₃O₄-C catalyst exhibited superior catalytic activity and stability (T₉₀ = 318 °C) with performance is in the leading position among the catalysts reported at present. Significantly, this study employed a combination of in situ and quasi in situ characterization techniques to elucidate the structural evolution and reaction pathway of the catalyst during the catalytic oxidation of o-DCB. In summary, this work provides valuable theoretical guidance and design principles for developing high-performance catalysts.