Issue 2, 2015

Enhanced CO2 adsorption capacity of amine-functionalized MIL-100(Cr) metal–organic frameworks

Abstract

Amine-functionalized metal–organic frameworks EN-MIL-100(Cr) and MMEN-MIL-100(Cr) were prepared by grafting ethylenediamine and N,N′-dimethylethylenediamine molecules, respectively, on coordinatively unsaturated chromium(III) cations in MIL-100 metal–organic frameworks. Although amine grafting results in a decrease in the surface area and pore volume of the functionalized samples compared to those of the bare MIL-100(Cr), results showed that the incorporation of amine groups into the MIL-100 framework improved both carbon dioxide adsorption capacity and kinetics, especially in the case of ethylenediamine. Heats of carbon dioxide adsorption in EN-MIL-100(Cr) and MMEN-MIL-100(Cr) were about 80 kJ mol−1 at zero coverage, a value higher than that shown by MIL-100(Cr), which suggests chemisorption between CO2 and pendant amine groups. Measurement of CO2 adsorption–desorption cycles proved that functionalized materials show good regenerability and stability.

Graphical abstract: Enhanced CO2 adsorption capacity of amine-functionalized MIL-100(Cr) metal–organic frameworks

Supplementary files

Article information

Article type
Paper
Submitted
20 jun 2014
Accepted
11 set 2014
First published
11 set 2014

CrystEngComm, 2015,17, 430-437

Author version available

Enhanced CO2 adsorption capacity of amine-functionalized MIL-100(Cr) metal–organic frameworks

C. P. Cabello, G. Berlier, G. Magnacca, P. Rumori and G. T. Palomino, CrystEngComm, 2015, 17, 430 DOI: 10.1039/C4CE01265H

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