Flexible-robust interlayer space in a 2D metal-organic framework for light hydrocarbons separation
SEPARATION AND PURIFICATION TECHNOLOGY(2024)
Abstract
The separation of light hydrocarbons is industrially important and scientifically challenging due to their high similarity in physicochemical properties. Two-dimensional metal-organic frameworks (2D MOFs) assembled by weak supramolecular interactions are more likely to induce structural flexibility and exhibit guest-dependent gate-opening behavior than 3D MOFs, opening new horizons for LHs storage and separation. Here, a 2D MOF (Cu-APC, APC = 2-aminopyrimidine-5-carboxylic acid) with flexible-robust interlayer space was effectively used as an adsorbent to realize C2 and C3 hydrocarbons separation. Evidenced by gas adsorption isotherms and the ideal adsorbed solution theory (IAST) calculations, Cu-APC exhibits moderate C2H2/CO2 selectivity (2.87), high C2H6/C2H4 selectivity (2.27) and unique multistep adsorption behavior toward C3H4/C3H6 at ambient conditions. Moreover, theoretical calculations revealed that C-H & sdot;& sdot;& sdot;N, C=O & sdot;& sdot;& sdot;H-C, and C-H & sdot;& sdot;& sdot;it interactions are formed with C2H2, CO2, C2H4, and C2H6 in the suitable pockets within Cu-APC. The separation performances of Cu-APC for C2H2/CO2, C2H6/C2H4, and C3H4/C3H6 mixtures were also confirmed by column breakthrough experiments.
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Key words
Metal -organic frameworks,Flexible -robust interlayer space,Light hydrocarbons,Adsorptive separation
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