US EPA

7447008 

Journal Article 

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

Choe, JH; Kang, D; Kang, M; Kim, H; Park, , JR; Kim, D; Hong, CS 

2019 

Royal Society of Chemistry 

3 

12 

2759-2767 

English 

10.1039/c9qm00581a 

WOS:000499250700022 

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. © Royal Society of Chemistry and the Chinese Chemical Society 2019.