High-Pressure Molecular Sieving of High-Humidity C2H4/C2H6 Mixture by a Hydrophobic Flexible Metal-Organic Framework.
Angew Chem Int Ed Engl
; 63(34): e202317648, 2024 Aug 19.
Article
em En
| MEDLINE
| ID: mdl-38837493
ABSTRACT
Molecular sieving is an ideal separation mechanism, but controlling pore size, restricting framework flexibility, and avoiding strong adsorption are all very challenging. Here, we report a flexible adsorbent showing molecular sieving at ambient temperature and high pressure, even under high humidity. While typical guest-induced transformations are observed, a high transition pressure of 16.6â
atm is observed for C2H4 at 298â
K because of very weak C2H4 adsorption (~16â
kJ mol-1). Also, C2H6 is completely excluded below the pore-opening pressure of 7.7â
atm, giving single-component selectivity of ca. 300. Quantitative high-pressure column breakthrough experiments using 1 1â
C2H4/C2H6 mixtures at 10â
atm as input confirm molecular sieving with C2H4 adsorption of 0.73â
mmol g-1 or 32â
cm3(STP) cm-3 and negligible C2H6 adsorption of 0.001(2) mmol g-1, and the adsorbent can be completely regenerated by inert gas purging. Furthermore, it is highly hydrophobic with negligible water adsorption, and the C2H4/C2H6 separation performance is unaffected at high humidity.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China