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Issue 40, 2017
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Lewis basic site (LBS)-functionalized zeolite-like supramolecular assemblies (ZSAs) with high CO2 uptake performance and highly selective CO2/CH4 separation

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Abstract

Herein, three functional isoreticular zeolite-like supramolecular assemblies (ZSAs), [Co4(NH2-ImDC)4(1,2-PDA)4]·8H2O (ZSA-7), [Co4(CH2OH-ImDC)4(1,2-PDA)4]·8H2O (ZSA-8), and [Co4(Pr-ImDC)4(1,2-PDA)4]·9H2O (ZSA-9), NH2-ImDC = 2-amino-4,5-imidazoledicarboxylic acid, CH2OH-ImDC = 2-hydroxymethyl-4,5-imidazoledicarboxylic acid, Pr-ImDC = 2-propyl-4,5-imidazoledicarboxylic acid, 1,2-PDA = 1,2-propanediamine, were hydrothermally synthesized and structurally characterized. All three compounds are isoreticular to ZSA-1, with the modification of different functional groups of –NH2, –CH2OH, and –Pr in imidazole dicarboxylate ligands. ZSA-7 and ZSA-8 display high CO2 adsorption abilities (109.8 and 114.0 cm3 g−1 at 273 K, respectively, under 1 bar) and outstanding natural gas selectivity separation, especially for CO2 over CH4 (39.8 and 35.7 for CO2/CH4 = 0.5/0.5 and 76.0 and 51.6 for CO2/CH4 = 0.05/0.95, respectively, under 1 bar at 298 K). In contrast, ZSA-9 is used for comparison to illustrate the effect of the introduction of Lewis basic sites (LBSs). Thus, all three ZSAs are promising materials for gas adsorption and purification applications.

Graphical abstract: Lewis basic site (LBS)-functionalized zeolite-like supramolecular assemblies (ZSAs) with high CO2 uptake performance and highly selective CO2/CH4 separation

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Publication details

The article was received on 11 Jul 2017, accepted on 19 Sep 2017 and first published on 19 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06003C
Citation: J. Mater. Chem. A, 2017,5, 21429-21434
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    Lewis basic site (LBS)-functionalized zeolite-like supramolecular assemblies (ZSAs) with high CO2 uptake performance and highly selective CO2/CH4 separation

    J. Li, C. Dai, Y. Cao, X. Sun, G. Li, Q. Huo and Y. Liu, J. Mater. Chem. A, 2017, 5, 21429
    DOI: 10.1039/C7TA06003C

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