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Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
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A novel approach to prepare Cu(I)Zn@MIL-100(Fe) adsorbent with high CO adsorption capacity, CO/CO2 selectivity and stability via controlled host-guest redox reaction

Author(s)
Le, Van NhieuVo, The KyLee, Jeong HyeonKim, Jin ChulKim, Tea-HoonOh, Kwang HyunBae, Youn-SangKwak, Sang KyuKim, Jinsoo
Issued Date
2021-01
DOI
10.1016/j.cej.2020.126492
URI
https://scholarworks.unist.ac.kr/handle/201301/49849
Fulltext
https://www.sciencedirect.com/science/article/pii/S1385894720326206?via%3Dihub
Citation
CHEMICAL ENGINEERING JOURNAL, v.404, pp.126492
Abstract
The development of a CO-selective adsorbent with large CO adsorption capacity, high CO/CO2 selectivity, and good stability is an industrial challenge. In this study, a novel Cu(I)-incorporated MIL-100(Fe) adsorbent for CO/CO2 separation is prepared using a host-guest redox strategy by exploiting the co-addition of Zn(II) and Cu(II). The addition of Zn(II) resulted in a higher Cu(I) yield of the adsorbent due to the facilitated regeneration of Fe (II), which was utilized for the reduction of Cu(II). Remarkably, the CO/CO2 selectivity (104) of Cu(I)Zn@MIL-100(Fe)-10 was considerably higher than that of the benchmark Cu(I)-incorporated adsorbents. Increasing the Zn(II) concentration in Cu(I)Zn@MIL-100(Fe)-10 improved the oxygen resistance. Density functional theory calculations support our hypothesis that the above improvements are derived from stronger sigma-bonding between Cu(I) and CO and the facilitation of Fe(II) regeneration by the addition of Zn(II). This study opens a new perspective for developing efficient CO-selective pi-complexation adsorbents with high CO/CO2 selectivity and superior oxygen resistance.
Publisher
ELSEVIER SCIENCE SA
ISSN
1385-8947
Keyword (Author)
Carbon monoxide (CO)AdsorptionSeparationAdsorbentMetal-organic framework (MOF)Cu(I)
Keyword
METAL-ORGANIC FRAMEWORKGAS-MIXTURESSITESMIL-100(FE)CU(I)SEPARATIONDESULFURIZATIONREDUCTIONMOLECULESPRECURSOR

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