Lewis basic site (LBS)-functionalized zeolite-like supramolecular assemblies (ZSAs) with high CO2 uptake performance and highly selective CO2/CH4 separation. Issue 40 (3rd October 2017)

• Record Type: Journal Article
• Authors: Li, Jiantang; Dai, Cong; Cao, Yu; Sun, Xiaodong; Li, Guanghua; Huo, Qisheng; Liu, Yunling
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 40(2017)
• Page Start: 21429
• Page End: 21434
• Publication Date: 2017-10-03
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta06003c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : ZSA-7, ZSA-8, andZSA-9 have been hydrothermally synthesized by utilizing the functional modification strategy.ZSA-7 andZSA-8 possess high CO2 adsorption abilities and outstanding selectivity separation for CO2 over CH4 . Abstract : Herein, three functional isoreticular zeolite-like supramolecular assemblies (ZSAs), [Co4 (NH2 -ImDC)4 (1, 2-PDA)4 ]·8H2 O (ZSA-7 ), [Co4 (CH2 OH-ImDC)4 (1, 2-PDA)4 ]·8H2 O (ZSA-8 ), and [Co4 (Pr-ImDC)4 (1, 2-PDA)4 ]·9H2 O (ZSA-9 ), NH2 -ImDC = 2-amino-4, 5-imidazoledicarboxylic acid, CH2 OH-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 toZSA-1, with the modification of different functional groups of –NH2, –CH2 OH, and –Pr in imidazole dicarboxylate ligands.ZSA-7 andZSA-8 display high CO2 adsorption abilities (109.8 and 114.0 cm 3 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.