Efficient Xe/Kr separation on two Metal-Organic frameworks with distinct pore shapes

Zhenliang Zhu, Bei Li, Xing Liu, Peixin Zhang, Shixia Chen, Qiang Deng, Zheling Zeng, Jun Wang, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

Abstract

Adsorptive separation of xenon (Xe) from krypton (Kr) is challenging owing to their low concentrations and similar physical properties. Herein, we report two metal–organic frameworks (MOFs) assembled from the same aliphatic ligand (trans-1, 4-cyclohexanedicarboxylic acid, H2CDC), but showing distinct pore shapes. The rhombus pores on Al-CDC show a narrower pore aperture of 4.5 Å × 6.0 Å, contracting to the pseudo-square pores (5.8 Å × 6.8 Å) on Cu-CDC. As a result, Al-CDC exhibits a high Xe adsorption capacity (2.45 mmol g−1) and Xe/Kr selectivity (10.7) at 298 K and 1.0 bar. The confined pore space and abundant saturated C-H groups provide stronger van der Waals interactions toward Xe, which is disclosed by the Grand Canonical Monte Carlo (GCMC) and Density Functional Theory (DFT) calculations. Dynamic breakthrough experiments further confirm their industrial application potential and stable reusability.

Original languageEnglish (US)
Article number119132
JournalSeparation and Purification Technology
Volume274
DOIs
StatePublished - Nov 1 2021

Keywords

  • Adsorption
  • Metal–organic frameworks
  • Pore shapes
  • Xe/Kr separation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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