Rational Tuning of Zirconium Metal–Organic Framework Membranes for Hydrogen Purification

Behnam Ghalei, Kazuki Wakimoto, Chih Yi Wu, Ali Pournaghshband Isfahani, Takuma Yamamoto, Kento Sakurai, Masakazu Higuchi, Bor Kae Chang, Susumu Kitagawa, Easan Sivaniah

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

The effect of organic ligands on the separation performance of Zr based metal–organic framework (Zr-MOF) membranes was investigated. A series of Zr-MOF membranes with different ligand chemistry and functionality were synthesized by an in situ solvothermal method and a coordination modulation technique. The thin supported MOF layers (ca. 1 μm) showed the crystallographic orientation and pore structure of original MOF structures. The MOF membranes show excellent selectivity towards hydrogen owing to the molecular sieving effect when the bulkier linkers were used. The molecular simulation confirmed that the constricted pore apertures of the Zr-MOFs which were formed by the additional benzene rings lead to the decrease in the diffusivity of larger penetrants while hydrogen was not remarkably affected. The gas mixture separation factors of the MOF membranes reached to H2/CO2=26, H2/N2=13, H2/CH4=11.

Original languageEnglish
Pages (from-to)19034-19040
Number of pages7
JournalAngewandte Chemie - International Edition
Volume58
Issue number52
DOIs
StatePublished - 19 Dec 2019

Keywords

  • hydrogen
  • membranes
  • metal–organic frameworks
  • molecular simulation
  • separation

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