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

Van Nhieu Le, The Ky Vo, Jeong Hyeon Lee, Jin Chul Kim, Tea Hoon Kim, Kwang Hyun Oh, Youn Sang Bae, Sang Kyu Kwak, Jinsoo Kim

Research output: Contribution to journalArticle

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 (1 0 4) 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 σ-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 π-complexation adsorbents with high CO/CO2 selectivity and superior oxygen resistance.

Original languageEnglish
Article number126492
JournalChemical Engineering Journal
Volume404
DOIs
Publication statusPublished - 2021 Jan 15

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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