ie0c00441_si_001.pdf (702.31 kB)
Oxygen-Selective Adsorption Property of Ultramicroporous MOF Cu(Qc)2 for Air Separation
journal contribution
posted on 2020-03-23, 19:39 authored by Yuning Tang, Xun Wang, Yijing Wen, Xin Zhou, Zhong LiIn this work, the O2/N2 adsorption behavior
of ultramicroporous MOF Cu(Qc)2, with preferential adsorption
of O2 over N2, was investigated for the first
time. Cu(Qc)2 was prepared using a room-temperature synthesis
strategy and then characterized. High-pressure isotherms of O2 and N2 were measured at different temperatures.
The molecular simulation was used to reveal the adsorption mechanism
of O2 and N2 on the copper sites of Cu(Qc)2. Inverse gas chromatography (IGC) experiments were applied
to measure surface free energy for O2 and N2 adsorption for evaluation of the affinity between adsorbates O2/N2 and Cu(Qc)2. Results showed that
the adsorbed amounts of O2 on Cu(Qc)2 increased
significantly with pressure rising, reaching as high as 4.48 mmol/g
at 259 K and 50 bar, while that of N2 increased slowly
to 0.98 mmol/g. The uptake ratio of O2/N2 on
Cu(Qc)2 reached 4.62 at 298 K and 50 bar. The IAST-predicted
O2/N2 (21:78 v/v) selectivity of Cu(Qc)2 reached 7 at 259 K and 50 bar. The ultramicroporous MOF Cu(Qc)2 is the potential for separation of O2/N2 from the air.
