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

Jong Hyeak Choe, Dong Won Kang, Minjung Kang, Hyojin Kim, Jeoung Ryul Park, Dae Won Kim, Chang Seop Hong

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)2759-2767
Number of pages9
JournalMaterials Chemistry Frontiers
Volume3
Issue number12
DOIs
Publication statusPublished - 2019 Dec

ASJC Scopus subject areas

  • Materials Science(all)
  • Materials Chemistry

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