Sintering\nEvolving Mn<sub>2</sub>O<sub>3</sub>–LaMnO<sub>3</sub> Perovskite\nHeterointerfaces as Highly Active and Durable\nCatalysts for Catalytic Removal of Volatile Organic Compounds

Improving the catalyst performance for the thermal oxidation\nreaction\nfaces the daunting challenge of the activity–stability trade-off.\nHerein, an evolved heterointerface was constructed on spherical Mn<sub>2</sub>O<sub>3</sub> nanocatalysts to achieve exceptional stability\nwhile maintaining adequate activity by simply introducing La. The\ngeneration of the active Mn<sub>3</sub>O<sub>4</sub>–Mn<sub>2</sub>O<sub>3</sub> heterointerfaces by La doping was experimentally\nobserved, which further segregates to the surface during thermal aging\nand forms epitaxially grown heterostructured LaMnO<sub>3</sub>–Mn<sub>2</sub>O<sub>3</sub> with Mn atoms. The former can act as highly\nactive sites for the deep oxidation of VOCs due to the richness in\noxygen vacancies and Mn<sup>4+</sup> ions, while the latter acts as\nthe diffusion barrier to inhibit grain growth and produce advantageous\nreactive electronic structures around the interface. The La-modified\nMn<sub>2</sub>O<sub>3</sub> oxide reached 90% conversion in toluene\noxidation at 286 °C under the high WHSV of 240,000 mL g<sup>–1</sup> h<sup>–1</sup> and slightly increased to 327 °C after\nthermal aging at 800 °C. This work provides a versatile strategy\nfor fabricating effective oxidation catalysts with high low-temperature\nactivity and antisintering properties for industrial applications.