Zr-MOFs for CF/CH, CH/H, and CH/N Separation: Towards the Goal of Discovering Stable and Effective Adsorbents

Overview

Journal Mol Syst Des Eng

Publisher Royal Society of Chemistry

Date 2021 Aug 12

PMID 34381619

Citations 3

Authors

Hakan Demir

Seda Keskin

Affiliations

Soon will be listed here.

Abstract

Zirconium metal-organic frameworks (MOFs) can be promising adsorbents for various applications as they are highly stable in different chemical environments. In this work, a collection of Zr-MOFs comprised of more than 100 materials is screened for CF/CH, CH/H, and CH/N separations using atomistic-level simulations. The top three MOFs for the CF/CH separation are identified as PCN-700-BPDC-TPDC, LIFM-90, and BUT-67 exhibiting CF/CH adsorption selectivities of 4.8, 4.6, and 4.7, CF working capacities of 2.0, 2.0, and 2.1 mol kg, and regenerabilities of 85.1, 84.2, and 75.7%, respectively. For the CH/H separation, MOF-812, BUT-67, and BUT-66 are determined to be the top performing MOFs demonstrating CH/H selectivities of 61.6, 36.7, and 46.2, CH working capacities of 3.0, 4.1, and 3.4 mol kg, and CH regenerabilities of 70.7, 82.7, and 74.7%, respectively. Regarding the CH/N separation, BUT-67, Zr-AbBA, and PCN-702 achieving CH/N selectivities of 4.5, 3.4, and 3.8, CH working capacities of 3.6, 3.9, and 3.5 mol kg, and CH regenerabilities of 81.1, 84.0, and 84.5%, in successive order, show the best overall separation performances. To further elucidate the adsorption in top performing adsorbents, the adsorption sites in these materials are analyzed using radial distribution functions and adsorbate density profiles. Finally, the water affinities of Zr-MOFs are explored to comment on their practical use in real gas separation applications. Our findings may inspire future studies probing the adsorption/separation mechanisms and performances of Zr-MOFs for different gases.

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