Enhanced CO2 adsorption capacity of amine-functionalized MIL-100(Cr) metal–organic frameworks. Issue 2 (30th September 2014)

• Record Type: Journal Article
• Authors: Cabello, Carlos Palomino; Berlier, Gloria; Magnacca, Giuliana; Rumori, Paolo; Palomino, Gemma Turnes
• Is Part Of: CrystEngComm. Volume 17:Issue 2(2015)
• Page Start: 430
• Page End: 437
• Publication Date: 2014-09-30
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c4ce01265h
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Functionalization of the MIL-100(Cr) metal–organic framework with alkylamines (ethylenediamine and N, N ′-dimethylethylenediamine) improves carbon dioxide sorption properties, especially in the case of ethylenediamine. 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.