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High Resolution Image Download MS PowerPoint Slide Nanoporous adsorbent materials are a key part of many industrial processes, including the rapidly expanding carbon capture industry. The development of advanced sorbents requires an assessment of the sorbent’s performance under mixed-gas conditions. Existing measurement techniques tend to be slow, material-intensive, and have limited ability to measure competitive mixed-gas sorption. We have developed a novel technique that measures thin films of sorbents deposited onto sensitive microelectromechanical system (MEMS) transducers. This technique is fast, requires very little material, and enables real-time monitoring of binary gas sorption. We report measurements of CO 2 /H 2 O mixed-gas isotherms at three different temperatures on the carbon capture MOF CALF-20. The measured experimental data on CO 2 /H 2 O mixture adsorption in CALF-20 demonstrate the severe limitations of the Ideal Adsorbed Solution Theory (IAST) in providing a quantitative estimation of the component loadings. Departures from the IAST are quantified by the introduction of activity coefficients and the use of the Real Adsorbed Solution Theory (RAST).
Moreton et al. (Wed,) studied this question.