Acid Gas Stability of Zeolitic Imidazolate Frameworks: Generalized Kinetic and Thermodynamic Characteristics

• DOI: 10.1021/acs.chemmater.8b01394
• Publication Date: 2018-05-30T00:45:35Z
• Authors: Souryadeep Bhatta...; Rebecca Han; Wun-Gwi Kim; Yadong Chiang; Krishna C. Jayach...; Julian T. Hungerford; Michael R. Dutzer; Chen Ma; Krista S. Walton; David S. Sholl; Sankar Nair
• Keywords: Zeolitic imidazolate framework; Nanoporous; Degradation; Chemical Stability

Acid gases such as SO2 and CO2 are present in many environments which the use of nanoporous metal–organic frameworks (MOFs) is envisaged. Among frameworks, zeolitic imidazolate (ZIFs) have been extensively explored membranes or adsorbents. However, there little systematic knowledge effects acid gas exposure on structure ZIFs, particular mechanistic aspects ZIF degradation by well crystal topology linker composition their stability. Here we a generalized quantitative investigation kinetic thermodynamic stability diverse range materials. The 16 ZIFs (of SOD, RHO, ANA, GME topologies) under different environments—humid air, liquid water, (dry, humid, aqueous)—is investigated suite experimental computational methods. kinetics to humid studied detail, effective rate constants for reported first time. Remarkably, correlate strongly with pKa water adsorption manner contrary that expected from previous predictions literature. Furthermore, find material ZIF-71 (RHO topology) shows much higher relative other environments.