Login / Signup

Host-Guest Interaction Modulation in Porous Coordination Polymers for Inverse Selective CO2 /C2 H2 Separation.

Yi-Fan GuJia-Jia ZhengKen-Ichi OtakeMohana ShivannaShigeyoshi SakakiHaruka YoshinoMasaaki OhbaShogo KawaguchiYing WangFengting LiSusumu Kitagawa
Published in: Angewandte Chemie (International ed. in English) (2021)
Controlling gas sorption by simple pore modification is important in molecular recognition and industrial separation processes. In particular, it is challenging to realize the inverse selectivity, which reduces the adsorption of a high-affinity gas and increases the adsorption of a low-affinity gas. Herein, an "opposite action" strategy is demonstrated for boosting CO2 /C2 H2 selectivity in porous coordination polymers (PCPs). A precise steric design of channel pores using an amino group as an additional interacting site enabled the synergetic increase in CO2 adsorption while suppressing the C2 H2 adsorption. Based on this strategy, two new ultramicroporous PCP physisorbents that are isostructural were synthesised. They exhibited the highest CO2 uptake and CO2 /C2 H2 volume uptake ratio at 298 K. Origin of this specific selectivity was verified by detailed density functional theory calculations. The breakthrough separation performances with remarkable stability and recyclability of both the PCPs render them relevant materials for C2 H2 purification from CO2 /C2 H2 mixtures.
Keyphrases