Isotope-selective pore opening in a flexible metal-organic framework.
Isotope-selective pore opening in a flexible metal-organic framework.
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DOI:
10.1126/sciadv.abn7035
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发表时间:
2022-04-15
期刊:
影响因子:
13.6
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中科院分区:
文献类型:
--
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Flexible metal-organic frameworks that show reversible guest-induced phase transitions between closed and open pore phases have enormous potential for highly selective, energy-efficient gas separations. Here, we present the gate-opening process of DUT-8(Ni) that selectively responds to D2, whereas no response is observed for H2 and HD. In situ neutron diffraction directly reveals this pressure-dependent phase transition. Low-temperature thermal desorption spectroscopy measurements indicate an outstanding D2-over-H2 selectivity of 11.6 at 23.3 K, with high D2 uptake. First-principles calculations coupled with statistical thermodynamics predict the isotope-selective gate opening, rationalized by pronounced nuclear quantum effects. Simulations suggest DUT-8(Ni) to remain closed in the presence of HT, while it also opens for DT and T2, demonstrating gate opening as a highly effective approach for isotopolog separation. The flexible metal-organic framework DUT-8(Ni) displays exclusive pore opening to D2 and high selectivity over H2 and HD.
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