Understanding the anomalous alkane selectivity of ZIF-7 in the separation of light alkane/alkene mixtures

Johan Van Den Bergh, Canan Gücüyener, Evgeny A. Pidko, Emiel J.M. Hensen, Jorge Gascon Sabate*, Freek Kapteijn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

215 Scopus citations

Abstract

C2 and C3 alkanes are selectively adsorbed from mixtures over the corresponding alkenes on the zeolite imidazolate framework ZIF-7 through a gate-opening mechanism. As a result, the direct production of the pure alkene upon adsorption and the pure alkane upon desorption in packed columns is possible. Herein, a detailed investigation of the step-wise adsorption and separation of alkanes and alkenes is presented, together with a rigorous performance assessment. A molecular picture of the gate-opening mechanism underlying the unprecedented selectivity towards alkane adsorption is proposed based on DFT calculations and a thermodynamic analysis of the adsorption-desorption isotherms.

Original languageEnglish (US)
Pages (from-to)8832-8840
Number of pages9
JournalChemistry - A European Journal
Volume17
Issue number32
DOIs
StatePublished - Aug 1 2011

Keywords

  • ZIF-7
  • alkanes
  • alkenes
  • metal-organic frameworks
  • separation

ASJC Scopus subject areas

  • Chemistry(all)

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