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CoNi Alloy Nanoparticles Embedded in Metal–Organic Framework‐Derived Carbon for the Highly Efficient Separation of Xenon and Krypton via a Charge‐Transfer Effect
Author(s) -
Chen Fuqiang,
Ding Jiaqi,
Guo Kaiqing,
Yang Liu,
Zhang Zhiguo,
Yang Qiwei,
Yang Yiwen,
Bao Zongbi,
He Yi,
Ren Qilong
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202011778
Subject(s) - adsorption , xenon , nanoparticle , krypton , selectivity , carbon fibers , alloy , materials science , metal , chemical engineering , pyrolysis , density functional theory , metal organic framework , chemistry , nanotechnology , computational chemistry , organic chemistry , catalysis , composite material , metallurgy , composite number , engineering
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.