Highly CO selective Cu(I)-doped MIL-100(Fe) adsorbent with high CO/CO2 selectivity due to Π complexation: Effects of Cu(I) loading and activation temperature

The Ky Vo, Youn Sang Bae, Bong Jun Chang, Su Young Moon, Jeong Hoon Kim, Jinsoo Kim

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Cu(I) doping of octahedral MIL-100(Fe) was successfully performed by means of impregnation and consequent reduction under vacuum conditions. Although MIL-100(Fe) adsorbed CO2 better than CO, Cu(I)@MIL-100(Fe) showed selective CO adsorption compared to CO2 owing to π complexation between CO and Cu(I). Effects of Cu(I) loading concentration, activation temperature, and adsorption temperature upon CO/CO2 adsorption properties were systematically investigated. The adsorption behaviors of CO and CO2 on MIL-100(Fe) and Cu(I)@MIL-100(Fe) were well described by the dual-site Langmuir–Freundlich (DSLF) model. Ideal adsorbed solution theory (IAST) was used to predict adsorption isotherms of equimolar CO and CO2 mixtures and to predict CO/CO2 selectivities as a function of bulk pressure. The obtained results showed that 45 wt% Cu(I)-doped MIL-100(Fe) had CO adsorption capacity of 3.10 mmol g−1 and CO/CO2 selectivity of 420 at 298 K and 1 bar. In addition, a large CO working capacity of 1.39 mmol g−1 was observed for 45 wt% Cu(I)-doped MIL-100(Fe) in the pressure range of 10–100 kPa. Cu(I)-doped MIL-100(Fe) thus appears promising as an adsorbent material for effective CO/CO2 separation.

Original languageEnglish
Pages (from-to)17-24
Number of pages8
JournalMicroporous and Mesoporous Materials
Publication statusPublished - 2019 Jan 15


All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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