Mn-based heterostructure catalysts show great potential for catalytic oxidation of toluene owing to the unique properties of their hetero-interfaces. Herein, we tailored the MnO₂ heteroepitaxy over Mn₂O₃ to achieve well-defined morphology and constructed clean MnO₂-Mn₂O₃ heterostructure interfaces by H⁺/KMnO₄ treatment. The T-0.5 catalyst (treating duration of 0.5 h) gave the highest activity and good stability. The interface enhanced the reducibility and oxygen storage capacity compared with pure Mn₂O₃. Surface reconstruction and metastable facets exposure were observed after the H⁺/KMnO₄ treatment, leading to the easy-release of lattice oxygen. Additionally, abundant oxygen vacancies and redundant coordination lattice oxygen were observed at the MnO₂ and Mn₂O₃ sides of the hetero-interface, respectively. These features provided ample oxygen adspecies and increased lattice oxygen mobility. The interface-related oxygen vacancies facilitated methyl dehydrogenation and demethylation of adsorbed toluene. The redundant coordination lattice oxygen contributed to the enhanced aromatic ring breakage capability.

锰基异质结构催化剂由于其异质界面的独特性质而具有很大的甲苯催化氧化潜力。本文中，我们在Mn ₂ O ₃上修整了MnO ₂异质外延性，以实现明确的形态，并通过H ⁺ / KMnO ₄处理构建了干净的MnO ₂ -Mn ₂ O ₃异质结构界面。T-0.5催化剂（处理时间为0.5 h）具有最高的活性和良好的稳定性。与纯Mn ₂ O ₃相比，该界面增强了还原性和储氧能力。H ⁺ / KMnO ₄处理后，观察到表面重建和亚稳态小平面暴露，导致晶格氧易于释放。另外，在异质界面的MnO ₂和Mn ₂ O ₃侧分别观察到大量的氧空位和冗余的配位晶格氧。这些特征提供了充足的氧气种类和增加的晶格氧气迁移率。与界面有关的氧空位促进了吸附的甲苯的甲基脱氢和脱甲基。多余的配位晶格氧有助于增强芳环的断裂能力。