Ozone Decomposition by a Manganese-Organic Framework over the Entire Humidity Range

Ground-level ozone (O₃) is one of the main airborne pollutants detrimental to human health and ecosystems. However, the designed synthesis of high-performance O₃ elimination catalysts suitable for broadly variable air compositions, especially a variable water vapor content, remains daunting. Herein, we report a new manganese-based metal organic framework, [Mn₃(μ₃-OH)₂(TTPE)(H₂O)₄]·2H₂O (H₄TTPE = 1,1,2,2-tetrakis(4-(2H-tetrazol-5-yl)phenyl) ethane), denoted as ZZU-281. ZZU-281 catalyzes O₃ decomposition with a nearly constant 100% working efficiency over the entire humidity range from dry (≤5% relative humidity (RH)) to high humidity (90% RH). We found that the maintainable coordinated water molecules and OH groups are activated by Mn²⁺, becoming active sites for O₃ transfer to O₂ with a low activation energy. The unique open channels, water retainability, and water stability of ZZU-281 further support the high catalytic performance. This work opens a new avenue for designing efficient catalysts for O₃ elimination in practice.