Metal-Organic Frameworks for Breakthrough Separation of 2-Butene Isomers with High Dynamic Selectivity and Capacity

Shuyi Jiang, Hao Sun, Ke Gong, Xin Huang, Yuhao Zhu, Xiao Feng*, Jing Xie*, Jingyao Liu*, Bo Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Developing porous sorbents represents a potential energy-efficient way for industrial gas separation. However, a bottleneck for reducing the energy penalty is the trade-off between dynamic adsorption capacity and selectivity. Herein, we showed this problem can be overcome by modulating the kinetic and thermodynamic separation behaviours in metal–organic frameworks for sieving 2-butene geometric isomers, which are desired for upgrading the raffinates to higher value-added end products. We found that the iron-triazolate framework can realize the selective shape screening of 2-butene isomers assisted by electrostatic interactions at the pore apertures. Further introducing uncoordinated N binding sites by ligand substitution lowered the gas diffusion barrier and greatly boosted the dynamic separation performance. In breakthrough tests under ambient conditions, trans-2-C4H8 can be efficiently separated from cis-2-C4H8 with a record capacity of 2.10 mmol g−1 with high dynamic selectivity of 2.39.

Original languageEnglish
Article numbere202302036
JournalAngewandte Chemie - International Edition
Volume62
Issue number22
DOIs
Publication statusPublished - 22 May 2023

Keywords

  • 2-Butene Isomers Separation
  • Breakthrough Separation
  • Dynamic Capacity
  • Dynamic Selectivity
  • Metal–Organic Frameworks

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