The suitability of elastic layered metal-organic frameworks (ELM) for the removal of carbon dioxide from methane-rich gas mixtures was evaluated using molecular modeling and experimental measurements for two adsorbents, ELM-11 [Cu(BF4)2(bpy)2] and ELM-12 [Cu(OTf)2(bpy)2]. These materials are promising absorbents for CO2 separation from biogas and natural gas mixtures, due to their reversible gated isotherm features and their high selectivity adsorption of CO2 over CH4 (S = 50-100 at 298 K) from gas mixtures with CH4 and CO2 compositions representative of biogas / natural gas extraction streams.
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