Jump to main content
Jump to site search


Selective CO2 adsorption by a new metal-organic framework: synergy between open metal sites and a charged imidazolinium backbone

Abstract

Metal-organic frameworks (MOFs) are porous, tunable crystalline materials that are attracting widespread scientific attention for their potential use in post-combustion CO2 capture. In this work, we report the synthesis of a new ligand, 1,3-bis(4-carboxyphenyl)-4,5-dihydro-1H-imidazol-3-ium tetrafluoroborate, H2Sp5-BF4, that is subsequently used for the construction of a novel MOF, Cu-Sp5-EtOH. This highly crystalline material is a charged framework that is expected to give rise to high CO2/N2 selectivity. However, the pores of the parent structure could not be accessed due to the presence of non-volatile ethanol molecules. After solvent exchange with methanol and subseuquently heating Cu-Sp5-MeOH under vacuum, we are able to liberate the solvent providing other small molecules like CO2 access to the inside of the now porous structure, Cu-Sp5. The combination of open-metal sites and framework charge leads to an exceptionally high CO2/N2 selectivity, as determined by Ideal Adsorbed Solution Theory (IAST) calculations performed on single-component adsorption isotherms. The CO2/N2 selectivity of Cu-Sp5 reaches a value of over 200 at pressures typically found in post-combustion flue gas (0.15 bar CO2 / 0.85 bar N2), a value that is among the highest reported to date.

Back to tab navigation

Supplementary files

Publication details

The article was received on 30 Mar 2018, accepted on 18 May 2018 and first published on 18 May 2018


Article type: Paper
DOI: 10.1039/C8DT01247D
Citation: Dalton Trans., 2018, Accepted Manuscript
  •   Request permissions

    Selective CO2 adsorption by a new metal-organic framework: synergy between open metal sites and a charged imidazolinium backbone

    I. Kochetygov, S. Bulut, M. Asgari and W. L. Queen, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT01247D

Search articles by author

Spotlight

Advertisements