Two novel 4,6-connected anion-pillared metal-organic frameworks for simultaneous separation of C3 and C4 olefins

Yuan Liu, Yan Zhang, Peixin Zhang, Yong Peng, Xing Liu, Jingwen Chen, Shixia Chen, Zheling Zeng, Jun Wang, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

Abstract

The adsorptive separation of C3 (propane/propylene) and C4 olefins (1,3-butadiene/C4 alkenes) by a single material are of great commercial significance to make full use of these raw chemicals and adsorbents; however, the precise fabrication of porous materials with fine-tuning pores and multiple binding sites to discriminate these guest molecules remain challenging. Herein, we report two new 4,6-connected fsc-net anion-pillared copper MOFs (TIFSIX-Cu-TPB and SIFSIX-Cu-TPB) for which the cavity and functional sites can be tuned by altering the anion pillars. The unique pore structure and abundant electronegative anions, as well as aromatic rings of MFSIX-Cu-TPB (M = Ti, Si), enabled the selective discrimination of both propylene/propane (C3H6/C3H8) and 1,3-butadiene/C4 olefins, displaying high propylene (2.85 mmol g−1) and 1,3-butadiene (3.35 mmol g−1) uptake at 1 bar and 298 K. Their separation performances are confirmed by breakthrough experiments, and the adsorption sites are identified by DFT-D calculations. To the best of our knowledge, the MFSIX-Cu-TPB (M = Ti, Si) represent the first example of anion-pillared MOFs that demonstrate the high separation efficiency in C3 and C4 olefin separations.

Original languageEnglish (US)
Article number108768
JournalChemical Engineering and Processing - Process Intensification
Volume172
DOIs
StatePublished - Feb 2022
Externally publishedYes

Keywords

  • 1,3-butadiene
  • Adsorptive separation
  • Metal-organic frameworks
  • Propylene

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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