A series of mixed-ligand [1,4-benzenedicarboxylic acid (BDC)/2-amino-1,4-benzenedicarboxylic acid (ABDC)] UiO-66 metal-organic frameworks (MOFs) synthesized through two different methods (low (LT) and high temperature (HT)) have been investigated for their carbon dioxide adsorption properties from 0 to 1 bar to clarify the role of amino loading on carbon dioxide uptake. Volumetric CO2 isotherms show that the CO2 capacity (normalized to the Langmuir surface area) increases with a degree of functionalization of about 46 %; for similar NH2 contents, the same values are found for both synthetic procedures. Microcalorimetric isotherms reveal that aminofunctionalized materials have a larger differential heat of adsorption (qdiff) towards CO2; reaching 27(25) and 20(22) kJmol-1 on HT(LT)-UiO-66-NH2 and UiO-66, respectively, at the lowest equilibrium pressures used in this study. All experimental results are supported by values obtained through quantum mechanical calculations.
Ethiraj, J., Albanese, E., Civalleri, B., Vitillo, J., Bonino, F., Chavan, S., et al. (2014). Carbon dioxide adsorption in amine-functionalized mixed-ligand metal-organic frameworks of UiO-66 topology. CHEMSUSCHEM, 7(12), 3382-3388 [10.1002/cssc.201402694].
Carbon dioxide adsorption in amine-functionalized mixed-ligand metal-organic frameworks of UiO-66 topology
ALBANESE, ELISASecondo
;
2014
Abstract
A series of mixed-ligand [1,4-benzenedicarboxylic acid (BDC)/2-amino-1,4-benzenedicarboxylic acid (ABDC)] UiO-66 metal-organic frameworks (MOFs) synthesized through two different methods (low (LT) and high temperature (HT)) have been investigated for their carbon dioxide adsorption properties from 0 to 1 bar to clarify the role of amino loading on carbon dioxide uptake. Volumetric CO2 isotherms show that the CO2 capacity (normalized to the Langmuir surface area) increases with a degree of functionalization of about 46 %; for similar NH2 contents, the same values are found for both synthetic procedures. Microcalorimetric isotherms reveal that aminofunctionalized materials have a larger differential heat of adsorption (qdiff) towards CO2; reaching 27(25) and 20(22) kJmol-1 on HT(LT)-UiO-66-NH2 and UiO-66, respectively, at the lowest equilibrium pressures used in this study. All experimental results are supported by values obtained through quantum mechanical calculations.
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