Facile loading of Cu(I) in MIL-100(Fe) through redox-active Fe(II) sites and remarkable propylene/propane separation performance

Ah Reum Kim, Tae Ung Yoon, Eun Jung Kim, Jung Woon Yoon, Seo Yul Kim, Ji Woong Yoon, Young Kyu Hwang, Jong San Chang, Youn Sang Bae

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

A novel Cu(I) loading method, which includes the reduction of CuCl2 to CuCl without an external reducing agent and high-temperature calcination, was developed using the redox properties of coordinatively unsaturated Fe(II) sites in MIL-100(Fe). The successful loading of Cu(I) ions and their redox-couple reactions are supported by various methods such as TEM/EDS, XPS, PXRD, and ICP-AES techniques, as well as N2 adsorption isotherms at 77 K. Compared to Cu loaded into isostructural MIL-100(Al) devoid of redox active sites, Cu(I)-loaded MIL-100(Fe) exhibits higher C3H6/C3H8 selectivity and superior air stability. This indicates that the Fe(II) sites in MIL-100(Fe) act as antioxidants that protect the resultant Cu(I) species, as well as reducing agents for CuCl2. Remarkably, in the typical pressure-swing adsorption (PSA) range (1–5 bar), the Cu(I)-loaded MIL-100(Fe) exhibits a large C3H6 working capacity as well as very high C3H6/C3H8 selectivities that are superior to those of the benchmark adsorbents, zeolite-13X and HKUST-1. Moreover, this material is easily regenerated under mild conditions and exhibits good separation performance under dynamic mixed-flow conditions. This facile method for loading Cu(I) can be applied to other adsorbents containing redox-active sites.

Original languageEnglish
Pages (from-to)777-784
Number of pages8
JournalChemical Engineering Journal
Volume331
DOIs
Publication statusPublished - 2018 Jan 1

All Science Journal Classification (ASJC) codes

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

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