Low-Concentration C2 H6 Capture Enabled by Size Matching in the Ultramicropore.
Chemistry
; 27(50): 12753-12757, 2021 Sep 06.
Article
in En
| MEDLINE
| ID: mdl-34173276
ABSTRACT
Low-concentration ethane capture is crucial for environmental protection and natural gas purification. The ideal physisorbent with strong C2 H6 interaction and large C2 H6 uptake at low-concentration level has rarely been reported, due to the large pKa value and small quadrupole moment of C2 H6 . Herein, we demonstrate the perfectly size matching between the ultramicropore (pore size of 4.6â
Å) and ethane (kinetic diameter of 4.4â
Å) in a nickel pyridine-4-carboxylate metal-organic framework (IISERP-MOF2), which enables the record-breaking performance for low concentration C2 H6 capture. IISERP-MOF2 exhibits the large C2 H6 adsorption enthalpy of 56.7â
kJ/mol, and record-high C2 H6 uptake at low pressure of 0.01-0.1â
bar and 298â
K (1.8â
mmol/g at 0.01â
bar). Molecule simulations and C2 H6 -loading crystal structure analysis revealed that the maximized interaction sites in IISERP-MOF2 with ethane molecule originates the strong C2 H6 adsorption. The dynamic breakthrough experiments for gas mixtures of C2 H6 /N2 (1/999, v/v) and C2 H6 /CH4 (5/95, v/v) proved the excellent low-concentration C2 H6 capture performance.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Metal-Organic Frameworks
/
Gases
Language:
En
Journal:
Chemistry
Journal subject:
QUIMICA
Year:
2021
Document type:
Article
Affiliation country:
China