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

Ground-level ozone (O-3) is one of the main airborne pollutants detrimental to human health and ecosystems. However, the designed synthesis of high-performance O-3 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, [Mn-3(mu(3)-OH)(2)(TTPE)(H2O)(4)]center dot 2H(2)O (H4TTPE = 1,1,2,2-tetrakis(4-(2H-tetrazol-5-yl)phenyl) ethane), denoted as ZZU-281. ZZU-281 catalyzes O-3 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 O-3 transfer to O-2 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 O-3 elimination in practice.

Automated summary

Ground-level ozone is a major airborne pollutant harmful to human health and ecosystems. The design of high-performance ozone elimination catalysts suitable for varying air compositions, especially water vapor content, remains challenging. ZZU-281, a new manganese-based metal organic framework, shows efficient ozone decomposition over a wide humidity range and possesses unique open channels and water stability.