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

Published

February 21, 2019

Author(s)

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

Abstract

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 (SIf6^2- 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.

Citation

Journal of Materials Chemistry A

Volume

7

Pub Type

Journals

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Keywords

Porous materials, Gas separation, Carbon capture

Citation

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 CO₂ Capture, Journal of Materials Chemistry A, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927255 (Accessed October 11, 2024)