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

Abstract

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.

Interstitial Atomic Bi Charge‐Alternating Processor Boosts Twofold Molecular Oxygen Activation Enabling Rapid Catalytic Oxidation Reactions at Room Temperature

“…A new peak located at 802 cm –1 is observed in the spectrum of 0.1Bi/MnO 2 in O 2 atmosphere indicating the presence of O – , which probably corresponds to the dangling adsorbed O. [ 33b,35 ] This result provenly confirms the fact that 0.1Bi/MnO 2 in O 2 atmosphere will adsorb O 2 and produce active O – to accomplish the oxidation of CH 3 SH. On the other hand, the active O – was also identified by the EPR measurement in the liquid phase for 0.1Bi/MnO 2 , as shown in Figure 3d,e.…”

Catalytic ozone decomposition and adsorptive VOCs removal in bimetallic metal-organic frameworks

“…For comparison, the O 3 removal performances of some representative materials were also evaluated under the same experimental conditions, including two MOFs previously reported to show high O 3 degradation activities, ZZU-281 31 and MIL-100(Fe) 30 , three metal oxides, α-Fe 2 O 3 , and a common adsorbent widely used in air purification, activated charcoal 43 . The structure, purity, and/or porosity of these reference materials were confirmed (Supplementary Figs.…”

“…Over the past decades, significant advances have been made in catalytic O 3 degradation using transition metal (Mn 21 , Fe 22 , Co 23 , Ni 24 , and Cu 25 ) oxides mostly. As a class of newly emerged materials, metal-organic frameworks (MOFs) have attracted great interest in various catalytic reactions because of their tunable structure and diverse functionality, including O 3 catalytic decomposition [26][27][28][29][30][31] . In addition, compared with transition metal oxides, MOFs can have highly porous structures, thus may offer extra catalytically active sites on interior pore surface, and even serve as advanced multifunctional materials to decompose O 3 and remove other airborne hazardous molecules by adsorption simultaneously [32][33][34][35][36] .…”

Ozone Decomposition below Room Temperature Using Mn-based Mullite YMn2O5

“…Ozone purification techniques include photolysis, pyrolysis, gas-phase reactions, dry deposition, catalytic decomposition, and so forth. − Catalytic dissociation is a promising technique as it dissociates O 3 into O 2 without introducing other harmful byproducts. The challenge is to catalyze O 3 below room temperature with long durability.…”