期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 5, 页码 2431-2438出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202011778
关键词
adsorption separation; carbon adsorbent; krypton; metal– organic frameworks; xenon
资金
- National Natural Science Foundation of China [21722609, 21878260]
- Zhejiang Provincial Natural Science Foundation of China [LR17B060001]
Utilizing CoNi alloy nanoparticles embedded carbon adsorbents derived from MOFs, a strategy for Xe/Kr separation demonstrates outstanding performance with high selectivity and binding energy, showing great potential in the gas industries.
Separation of Xe and Kr is one of the greatest challenges in the gas industries owing to their close molecular structure and similar properties. Energy-effective adsorption-based separation using chemically stable carbon adsorbents is a promising technology. We propose a strategy for Xe/Kr separation using MOF-derived metallic carbon adsorbents. M-Gallate (M=Ni, Co) were used as precursors to fabricate CoNi alloy nanoparticles embedded carbon adsorbents by one-step auto-reduction pyrolysis. The optimal NiCo@C-700 exhibits record-high IAST selectivity (24.1) and Henry's selectivity (20.1) of Xe/Kr among reported carbon adsorbents. DFT calculations, local density of states calculation, charge density difference, and Bader charge analysis reveal the great affinity with Xe benefits from the presence of Ni or CoNi nanoparticles as a result of more charge transfer from Xe than Kr to metal, thus providing higher binding energy. Breakthrough experiments further verify NiCo@C-700 a promising candidate for Xe/Kr separation.
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