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A Metal-Organic Framework with Suitable Pore Size and Dual Functionalities for Highly Efficient Post-Combustion CO2 Capture



Hui-Men Wen, Caijun Liao, Libo Li, Ali Alsalme, Zeid Alothman, Rajamani Krishna, Hui Wu, Wei Zhou, Jun Hu, Banglin Chen


Capturing carbon dioxide (Co2) from flue gases with porous materials has been considered as a viable alternative technology to replace the traditional liquid amine adsorbents. A large number of microporous metal-organic frameworks (MOFs) have been developed as CO2-capturing materials. However, it is challenging to target materials with both extremely high CO2 capture capacity and gas selectivity (so-called trade-off) along with moderate regeneration energy. Herein, we developed a novel porous material, [Cu(dpt)2(SiF6)]n (termed as UTSA-120; dpt = 3,6-Di(4-pyridyl)-1,2,4,5-tetrazine), which is isoreticular to the next of SIFSIX-2-Cu-i. This material exhibits simultaneously high CO2 capture capacity (3.56 mmol g-1 0.15 bar and 296 K) and CO2/N2 selectivity (600), both of which are superior to SIFSIX-2-Cu-i and most of other MOFs reported. Neutron powder diffraction experiments reveal that the exceptional CO2 capture capacity at low-pressure region and the moderate heat of CO2 adsorption can be attributed to the suitable pore and dual functionalities (SIf62- and tetrazine), which not only interact with CO2 molecules but also enable the dense pacing of CO2 molecules within the framework. Simulated and actual breakthrough experiments demonstrate the UtSA-120a can efficiently capture CO2 gas from the CO2/N2 (14/85, v/v) and CO2/CH4 (50/50) gas mixtures under ambient conditions.
Journal of Materials Chemistry A


Porous materials, Gas separation, Carbon capture


Wen, H. , Liao, C. , Li, L. , Alsalme, A. , Alothman, Z. , Krishna, R. , Wu, H. , Zhou, W. , Hu, J. and Chen, B. (2019), A Metal-Organic Framework with Suitable Pore Size and Dual Functionalities for Highly Efficient Post-Combustion CO<sub>2</sub> Capture, Journal of Materials Chemistry A, [online], (Accessed March 3, 2024)
Created February 20, 2019, Updated October 12, 2021