| Autor: |
Qiang Liu, Hui-Min Wen, Youjin Gong, Jiyan Pei, Boyu Liu, Shunshun Xiong, Bin Li, Xiaolin Wang |
| Rok vydání: |
2022 |
| DOI: |
10.21203/rs.3.rs-1266060/v1 |
| Popis: |
For adsorptive separation of xenon/krypton mixture, it still remains a daunting challenge to target both high Xe adsorption and selectivity in a single adsorbent because of their close size and inert nature. Herein, we report an ultra-microporous alkyl Cu-based MOF (MOF-11) with suitable pore architecture for benchmark Xe capture and separation. MOF-11 features small pore channels (4.4 Å) close to the kinetic diameter of Xe atom, in which a large number of oppositely adjacent open Cu-metal sites and alkyl cavities are densely arranged along the pore channels in staggered mode. Such unique pore system can not only introduce strong binding affinity with Xe, but also enable the dense packing of Xe inside the pores. This material thus shows the highest Xe storage density of 2826 g L-1 at ambient conditions, record-high Xe uptake of 4.0 mmol g-1 (at 0.2 bar and 298 K) and one of the highest Xe/Kr selectivity (19.1), significantly higher than most top-performing materials reported so far. The Xe molecules trapped within MOF-11 were visually identified by single-crystal X-ray diffraction experiment, which unveils the dense packing mechanism of Xe within the pores accountable for the record Xe capture capacity. The breakthrough experiments confirm that MOF-11 exhibits the exceptional separation performance for 20/80 Xe/Kr mixture with both record-high Xe uptake capacity (3.46 mmol g-1) and Kr productivity (350 cm3 g-1). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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