Sintering Evolving Mn₂O₃-LaMnO₃ Perovskite Heterointerfaces as Highly Active and Durable Catalysts for Catalytic...

Improving the catalyst performance for the thermal oxidation reaction faces the daunting challenge of the activity-stability trade-off. Herein, an evolved heterointerface was constructed on spherical Mn₂O₃ nanocatalysts to achieve exceptional stability while maintaining adequate activity by simply introducing La. The generation of the active Mn₃O₄-Mn₂O₃ heterointerfaces by La doping was experimentally observed, which further segregates to the surface during thermal aging and forms epitaxially grown heterostructured LaMnO₃-Mn₂O₃ with Mn atoms. The former can act as highly active sites for the deep oxidation of VOCs due to the richness in oxygen vacancies and Mn⁴⁺ ions, while the latter acts as the diffusion barrier to inhibit grain growth and produce advantageous reactive electronic structures around the interface. The La-modified Mn₂O₃ oxide reached 90% conversion in toluene oxidation at 286 °C under the high WHSV of 240,000 mL g^-1 h^-1 and slightly increased to 327 °C after thermal aging at 800 °C. This work provides a versatile strategy for fabricating effective oxidation catalysts with high low-temperature activity and antisintering properties for industrial applications.