Abstract
Many simulations of adsorption in nanoporous materials such as metal–organic frameworks (MOFs) treat the adsorbing materials as rigid. We show that the use of this approximation to describe the multicomponent adsorption of C8 aromatics in MOFs under industrial conditions gives results that differ dramatically from descriptions that include local framework flexibility. To address this issue, we develop an efficient method for capturing the effect of framework flexibility on adsorption in nanoporous materials. Our “flexible snapshot” method uses GCMC simulations to model adsorption in snapshots collected using fully flexible MD simulations and can be applied to any framework-adsorbate system for which reliable force fields are available. Our method gives considerably better agreement with experiments for multicomponent C8 aromatic selectivities in multiple MOFs than more traditional calculations using a single rigid framework. The rotation of organic linkers in the MOFs has a strong influence on selectiviti...
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