Post-synthetic incorporation of nickel into CPO-27(Mg) to give materials with enhanced permanent porosity

Juergen Kahr*, Russell E. Morris, Paul A. Wright

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Nickel cations have been introduced into framework sites of the magnesium dioxiterephthalate MOF, CPO-27(Mg), via a procedure involving post-synthetic treatment with an aqueous solution of Ni2+ cations and a weak acid. The final solids have Ni concentrations up to 70 mol% of the total cation content. Selected area EDX analysis, synchrotron X-ray powder diffraction and XPS surface analysis indicate that Ni2+ is distributed throughout the crystals with highest concentration at the external surface. A mechanism involving both crystallisation and predominant isomorphous cation replacement is proposed. The modified solids have much enhanced adsorption capacities following simple thermal evacuation under vacuum than unmodified CPO-27(Mg), particularly for N-2 at 77 K, for which uptakes of 17 mmol g(-1) are achieved. This is attributed to surface modification that makes the surface more stable to heating under evacuation.

Original languageEnglish
Pages (from-to)9779-9786
Number of pages8
JournalCrystEngComm
Volume15
Issue number45
DOIs
Publication statusPublished - 2013

Keywords

  • METAL-ORGANIC FRAMEWORKS
  • MICROPOROUS COORDINATION POLYMERS
  • CARBON-DIOXIDE
  • HYDROGEN ADSORPTION
  • FLUE-GAS
  • EXCHANGE
  • CRYSTAL
  • LIGAND
  • SITES
  • CO2

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