Adsorption of carbon dioxide, methane and nitrogen on an ultramicroporous copper metal-organic framework

Xiaofei Wu, Bin Yuan, Zongbi Bao, Shuguang Deng

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

An ultramicroporous copper metal-organic framework (Cu-MOF), Cu(hfipbb)(H2hfipbb)0.5 [H2hfipbb=4,4'-(hexafluoro-isopropylidene) bis(benzoic acid)] was successfully synthesized by a microwave-assisted method (1) with a shorter reaction time and higher MOFs yield. The obtained Cu-MOF sample was characterized with scanning electron microscopy for crystal structure, powder X-ray diffraction for phase structure, and carbon dioxide adsorption at 273K for pore textural properties. Single-component adsorption (adsorption equilibrium and kinetics) of CO2, CH4, and N2 on 1 was measured using a Micromeritics ASAP 2020 adsorption porosimeter at 278, 298 and 318K, and pressures up to 1bar. Isosteric heats of adsorption, Henry's constants, and diffusion time constants were calculated and carefully analyzed. Adsorption equilibrium selectivity (α), adsorbent selection parameter for pressure swing adsorption processes (S), kinetic selectivity and combined separation selectivity (β) for CO2/CH4, CO2/N2 and CH4/N2 binary mixtures were estimated based on the single-component adsorption data. The relative high values of the adsorption selectivities suggest that Cu-MOF is a promising adsorbent for separating CO2/CH4, CO2/N2 and CH4/N2 gas pairs.

Original languageEnglish (US)
Pages (from-to)78-84
Number of pages7
JournalJournal of Colloid And Interface Science
Volume430
DOIs
StatePublished - Sep 15 2014
Externally publishedYes

Keywords

  • Adsorption
  • Carbon dioxide
  • Cu-MOF
  • Methane
  • Microwave-assisted synthesis
  • Nitrogen
  • Separation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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