4.8 Article

Microscale Determination of Binary Gas Adsorption Isotherms in MOFs

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JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 45, 页码 20939-20946

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AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c09818

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  1. U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy
  2. [DE-EE0008814]

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This study demonstrates the utility and importance of using Raman spectroscopy to determine binary gas adsorption isotherms in MOF single crystals at the microscale. The technique allows for quantifying adsorption selectivity and determining the kinetics of methane adsorption, which is critical for adsorbed natural gas storage.
The experimental determination of mixed gas isotherms is challenging and thus rarely performed. Nevertheless, characterizing the performance of adsorbents toward mixtures of gases is critical in most adsorptive separations. Here, the utility of Raman spectroscopy in determining binary gas adsorption isotherms on the microscale with metal-organic framework (MOF) single crystals is demonstrated for quantifying C2H6/CH4 selectivity. The influence of pore size on sorption selectivity is determined experimentally. The technique also allows determination of kinetics of methane adsorption in MOFs, which is critical for refueling times in adsorbed natural gas storage.

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