Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 345, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2022.112284
Keywords
Dipeptide membrane; Molecular dynamics; Light hydrocarbon gases; Adsorption; Diffusion; Permeability; Selectivity
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Funding
- FEDER-European Regional Development Fund funds
- Portuguese funds through FCT-Fundacao para a Ciencia e a Tecnologia [POCI-01-0145-FEDER-029914-PTDC/QUI- QFI/29914/2017]
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The study demonstrates that microporous crystals of L-Isoleucyl-L-Valine and L-Valyl-L-Isoleucine can effectively distinguish between propane and propylene mixtures. Despite having similar pore diameters, L-Valyl-L-Isoleucine shows higher separation selectivity.
The separation of propane/propylene mixtures remains a subject under intensive research because designing cheaper, greener and sustainable processes is of paramount importance to industry. Dipeptides crystallize into several lattices displaying a variety of porosities that enable the separation of species with approximate size. In this study, we show that microporous crystals of L-Isoleucyl-L-Valine (IV) and L-Valyl-L-Isoleucine (VI) are able to distinguish between methane, propane and propylene. Adsorption equilibrium isotherms were determined and coupled with Molecular Dynamics simulations for computing diffusion and loading of binary mixtures of relevant gases in the dipeptide frameworks to obtain kinetic and equilibrium gas mixtures selectivities. It was found that although the pore diameters in both dipeptide crystals are similar, VI has a higher permselective separation of propane/propylene mixtures displaying a maximum ideal permselectivity of alpha P(C3H6)/C3/H8) = 1.3.
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