Low‐Concentration C2H6 Capture Enabled by Size Matching in the Ultramicropore

Low‐concentration ethane capture is crucial for environmental protection and natural gas purification. The ideal physisorbent with strong C2H6 interaction and large C2H6 uptake at low‐concentration level has rarely been reported, due to the large pKa value and small quadrupole moment of C2H6. Herein...

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Bibliographic Details
Published in:Chemistry : a European journal 2021-09, Vol.27 (50), p.12753-12757
Main Authors: Jiang, Xue, Wang, Yu, Cao, Jian‐Wei, Ye, Zi‐Ming, Zhang, Tao, Liu, De‐Xuan, Li, Kai‐Lei, Yang, Rong, Wang, Teng, Zhang, Qiu‐Yu, Chen, Kai‐Jie
Format: Article
Language:English
Subjects:
Adsorption
C2H6 capture
Chemistry
Crystal structure
Enthalpy
Environmental protection
Ethane
Gas mixtures
low concentration
Low pressure
Matching
Metal-organic frameworks
Molecular structure
Natural gas
Nickel
Pore size
Quadrupoles
size matching
Structural analysis
ultramicropores
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Summary:Low‐concentration ethane capture is crucial for environmental protection and natural gas purification. The ideal physisorbent with strong C2H6 interaction and large C2H6 uptake at low‐concentration level has rarely been reported, due to the large pKa value and small quadrupole moment of C2H6. Herein, we demonstrate the perfectly size matching between the ultramicropore (pore size of 4.6 Å) and ethane (kinetic diameter of 4.4 Å) in a nickel pyridine‐4‐carboxylate metal–organic framework (IISERP‐MOF2), which enables the record‐breaking performance for low concentration C2H6 capture. IISERP‐MOF2 exhibits the large C2H6 adsorption enthalpy of 56.7 kJ/mol, and record‐high C2H6 uptake at low pressure of 0.01–0.1 bar and 298 K (1.8 mmol/g at 0.01 bar). Molecule simulations and C2H6‐loading crystal structure analysis revealed that the maximized interaction sites in IISERP‐MOF2 with ethane molecule originates the strong C2H6 adsorption. The dynamic breakthrough experiments for gas mixtures of C2H6/N2(1/999, v/v) and C2H6/CH4 (5/95, v/v) proved the excellent low‐concentration C2H6 capture performance. Recorded C2H6adsorption at low concentration was achieved by precisely size matching in an ultramicroporous metal–organic framework. Low‐Concentration Ethane Capture Enabled by Size Matching in the Ultramicropore (Chen et al.).
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.202102234