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- W2806671343 abstract "Acid gases such as SO2 and CO2 are present in many environments in which the use of nanoporous metal–organic frameworks (MOFs) is envisaged. Among metal–organic frameworks, zeolitic imidazolate frameworks (ZIFs) have been extensively explored as membranes or adsorbents. However, there is little systematic knowledge of the effects of acid gas exposure on the structure of ZIFs, in particular the mechanistic aspects of ZIF degradation by acid gases as well as the effects of ZIF crystal topology and linker composition on their stability. Here we present a generalized and quantitative investigation of the kinetic and thermodynamic acid gas stability of a diverse range of ZIF materials. The stability of 16 ZIFs (of SOD, RHO, ANA, and GME topologies) under different environments—humid air, liquid water, and acid gases CO2 and SO2 (dry, humid, and aqueous)—is investigated by a suite of experimental and computational methods. The kinetics of ZIF degradation under exposure to humid SO2 is studied in detail, and effective rate constants for acid gas degradation of ZIFs are reported for the first time. Remarkably, the kinetics of degradation of the diverse ZIFs correlate strongly with the linker pKa and ZIF water adsorption in a manner contrary to that expected from previous predictions in the literature. Furthermore, we find that the material ZIF-71 (RHO topology) shows much higher stability relative to the other ZIFs in humid SO2 and CO2 environments." @default.
- W2806671343 created "2018-06-13" @default.
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- W2806671343 date "2018-05-29" @default.
- W2806671343 modified "2023-10-15" @default.
- W2806671343 title "Acid Gas Stability of Zeolitic Imidazolate Frameworks: Generalized Kinetic and Thermodynamic Characteristics" @default.
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- W2806671343 doi "https://doi.org/10.1021/acs.chemmater.8b01394" @default.
- W2806671343 hasPublicationYear "2018" @default.
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