Matrix Sensors, Inc.

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 microelectromech. system (MEMS) transducers.This technique is fast, requires very little material, and enables real-time monitoring of binary gas sorption.We report measurements of CO₂/H₂O mixed-gas isotherms at three different temperatures on the carbon capture MOF CALF-20.The measured exptl. data on CO₂/H₂O mixture adsorption in CALF-20 demonstrate the severe limitations of the Ideal Adsorbed Solution Theory (IAST) in providing a quant. 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).