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Revealing an unusual temperature-dependent CO2 adsorption trend and selective CO2 uptake over water vapors in a polyamine-appended metal–organic framework

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Abstract

We report the development of a tetraethylenepentamine (tepa)-functionalized Mg2(dobpdc) (T02, T2, T20, and T200; the number denotes equivalents of tepa used with respect to the framework), which uncommonly exhibited a gradual increase in CO2 uptake with increasing temperature when polyamine groups were heavily loaded into the framework (T20 and T200). For the moderately loaded sample (T2), a significant working capacity (11.2 wt%) and a cyclable CO2 performance at 40 °C and 15% CO2 pressure were obtained. The abrupt increase observed in the CO2 isotherms indicates that the tepa-loaded samples involve a CO2 insertion mechanism. Interestingly, all amine groups in tepa can partly participate in the formation of ammonium carbamate ion pairs, which is the first observation of this in amine-functionalized metal–organic frameworks. Remarkably, we demonstrate that high loading of tepa allowed for selective CO2 uptake over H2O vapors, together with enhanced framework stability under humid conditions.

Graphical abstract: Revealing an unusual temperature-dependent CO2 adsorption trend and selective CO2 uptake over water vapors in a polyamine-appended metal–organic framework

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Publication details

The article was received on 16 Sep 2019, accepted on 23 Oct 2019 and first published on 24 Oct 2019


Article type: Research Article
DOI: 10.1039/C9QM00581A
Mater. Chem. Front., 2019, Advance Article

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    Revealing an unusual temperature-dependent CO2 adsorption trend and selective CO2 uptake over water vapors in a polyamine-appended metal–organic framework

    J. H. Choe, D. W. Kang, M. Kang, H. Kim, J. R. Park, D. W. Kim and C. S. Hong, Mater. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QM00581A

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