In:
Angewandte Chemie, Wiley, Vol. 134, No. 25 ( 2022-06-20)
Abstract:
Metal‐organic frameworks have been widely studied in the separation of C 2 hydrocarbons, which usually preferentially bind unsaturated hydrocarbons with the order of acetylene (C 2 H 2 ) 〉 ethylene (C 2 H 4 ) 〉 ethane (C 2 H 6 ). Herein, we report an ultramicroporous fluorinated metal‐organic framework Zn‐FBA (H 2 FBA=4,4′‐(hexafluoroisopropylidene)bis(benzoic acid)), shows a reversed adsorption order characteristic for C 2 hydrocarbons, that the uptake for C 2 hydrocarbons of the framework and the binding affinity between the guest molecule and the framework follows the order C 2 H 6 〉 C 2 H 4 〉 C 2 H 2 . Density‐functional theory calculations confirm that the completely reversed adsorption order behavior is attributed to the close van der Waals interactions and multiple cooperative C−H⋅⋅⋅F hydrogen bonds between the framework and C 2 H 6 . Moreover, Zn‐FBA exhibits a high selectivity of about 2.9 for C 2 H 6 over C 2 H 4 at 298 K and 1 bar. The experimental breakthrough studies show that the high‐purity C 2 H 4 can be obtained from C 2 H 6 and C 2 H 4 mixtures in one step.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v134.25
DOI:
10.1002/ange.202204046
Language:
English
Publisher:
Wiley
Publication Date:
2022
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