| Institution: | 1. Key Laboratory of Special Functional andSmart Polymer Materials of Ministry of Industry and Information Technology, Xi'an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, 710072 Xi'an, Shaanxi (P.?R., China
These authors contributed equally to this work.;2. Key Laboratory of Special Functional andSmart Polymer Materials of Ministry of Industry and Information Technology, Xi'an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, 710072 Xi'an, Shaanxi (P.?R., China;3. MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, 510275 Guangzhou (P.?R., China |
| Abstract: | 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-MOF 2 ), which enables the record-breaking performance for low concentration C2H6 capture. IISERP-MOF 2 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-MOF 2 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. |
