Hierarchically Hollow MnO₂@CeO₂Heterostructures for NO Oxidation: Remarkably Promoted Activity and SO₂Tolerance

Thermochemical approaches of oxidizing NO to NO₂have been considered as the critical steps governing NO_xpurification technologies. However, developing efficient materials with boosted NO oxidation activity and strong SO₂resistance at low temperature still remains a significant challenge. This contribution discloses a versatile and scalable methodology for the design of hollow MnO₂@CeO₂heterostructures for NO oxidation. Due to its hollow core-shell nanostructure with a high density of active oxygen vacancies and improved charge-transfer efficiency induced by the heterojunction interface, the resulting material exhibits remarkable low-temperature catalytic activity in NO oxidation (T₅₀at 196 °C andT₉₂at 275 °C), achieving over 69 °C of temperature reduction in comparison with the commercial Pt/Al₂O₃catalyst (T₅₀at 275 °C). Remarkably, the SO₂tolerance of the hollow core-shell material is greatly enhanced due to the block accessibility of the mesoporous CeO₂shell (E_CeO2,SO2= −1.78 eV vsE_MnO2,SO2= −1.04 eV). This work exemplifies an alternative perspective in the design of high-performance hollow core-shell nanostructured catalysts for atmospheric pollutant purification and industrial thermal catalysis processes.