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Issue 12, 2015
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A supermolecular building layer approach for gas separation and storage applications: the eea and rtl MOF platforms for CO2 capture and hydrocarbon separation

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Abstract

The supermolecular building layer (SBL) approach was employed to deliberately synthesize five novel metal–organic frameworks (1–5) with an exposed array of amide or amine functionalities within their pore system. The ability to decorate the pores with nitrogen donor moieties offers potential to evaluate/elucidate the structure–adsorption property relationship. Two MOF platforms, eea-MOF and rtl-MOF, based on pillaring of kgm-a or sql-a layers with heterofunctional 3-connected organic building blocks were targeted and constructed to purposely introduce and expose the desired amide or amine functionalities. Interestingly, gas adsorption properties of eea-MOF-4 (1) and eea-MOF-5 (2) showed that by simply altering the nitrogen donor position within the ligand, it is possible to relatively reduce the pore size of the related eea-MOF material and subsequently increase the associated CO2 uptake. The slightly confined pore space in 2, relative to 1, has enabled an enhancement of the pore local charge density and thus the observed relative increase in the CO2 and H2 isosteric heat of adsorption (Qst). In addition, light hydrocarbon adsorption studies revealed that 2 is more selective toward C2H6 and C3H8 over CH4 than 1, as exemplified for C2H6 : CH4 (5 : 95) or C3H8 : CH4 (5 : 95) binary gas mixtures.

Graphical abstract: A supermolecular building layer approach for gas separation and storage applications: the eea and rtl MOF platforms for CO2 capture and hydrocarbon separation

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Supplementary files

Article information


Submitted
24 Dec 2014
Accepted
03 Feb 2015
First published
11 Feb 2015

This article is Open Access

J. Mater. Chem. A, 2015,3, 6276-6281
Article type
Communication

A supermolecular building layer approach for gas separation and storage applications: the eea and rtl MOF platforms for CO2 capture and hydrocarbon separation

Z. Chen, K. Adil, Ł. J. Weseliński, Y. Belmabkhout and M. Eddaoudi, J. Mater. Chem. A, 2015, 3, 6276
DOI: 10.1039/C4TA07115H

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