Issue 7, 2019

A metal–organic framework with suitable pore size and dual functionalities for highly efficient post-combustion CO2 capture

Abstract

Capturing carbon dioxide (CO2) from flue gases with porous materials has been considered as a viable alternative technology to replace 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 net of SIFSIX-2-Cu-i. This material exhibits simultaneously high CO2 capture capacity (3.56 mmol g−1 at 0.15 bar and 296 K) and CO2/N2 selectivity (∼600), both of which are superior to those of SIFSIX-2-Cu-i and most other MOFs reported. Neutron powder diffraction experiments reveal that the exceptional CO2 capture capacity at the low-pressure region and the moderate heat of CO2 adsorption can be attributed to the suitable pore size and dual functionalities (SiF62− and tetrazine), which not only interact with CO2 molecules but also enable the dense packing of CO2 molecules within the framework. Simulated and actual breakthrough experiments demonstrate that UTSA-120a can efficiently capture CO2 gas from the CO2/N2 (15/85, v/v) and CO2/CH4 (50/50) gas mixtures under ambient conditions.

Graphical abstract: A metal–organic framework with suitable pore size and dual functionalities for highly efficient post-combustion CO2 capture

Supplementary files

Article information

Article type
Paper
Submitted
03 Dec 2018
Accepted
14 Jan 2019
First published
14 Jan 2019

J. Mater. Chem. A, 2019,7, 3128-3134

A metal–organic framework with suitable pore size and dual functionalities for highly efficient post-combustion CO2 capture

H. Wen, C. Liao, L. Li, A. Alsalme, Z. Alothman, R. Krishna, H. Wu, W. Zhou, J. Hu and B. Chen, J. Mater. Chem. A, 2019, 7, 3128 DOI: 10.1039/C8TA11596F

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