Predicted Separation of Acid Gases from Gas Mixtures by Functionalized Porous Aromatic Frameworks

The selective adsorption of target acid gas molecules from binary gas mixtures by porous aromatic frameworks (PAFs) with two identical functional groups per aromatic ring (PAF-R2) was computationally investigated using grand canonical Monte Carlo simulations. PAF-R2 adsorption was considered for three binary mixtures of small molecular concentrations of acid gas and abundant nitrogen gas (CO2/N2, SO2/N2, and H2S/N2). The results indicate that additional functional groups enhance acid gas loadings and selectivity, compared with pristine PAF and single-functionalized PAFs. Low pressures yield linearly increasing gas loadings and constant selectivity, while high pressures yield much higher adsorption and selectivity. In particular, SO2 loading and selectivity under high pressures are heavily influenced by the PAF’s maximum adsorption limit, which can be linked back to the functional groups and their configuration. In summary, PAF-(3,5)-(COOH)2 (nomenclature of PAFs is provided in the Appendix in the Supporting Information) and many other PAF with the same two electron-withdrawing groups are predicted to have great acid gas adsorption and selectivity from gas mixtures, while PAF-(3,5)-(OH)2 (one of PAFs with two identical electron-donating groups) is predicted to have good adsorption and selectivity, especially under elevated pressures. The results of this work can provide insights into various types of PAFs with great selective adsorption ability and their corresponding conditions. The simulation procedures and results may inspire the exploration and screening of other types of PAFs or porous materials, for acid gas absorption.

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Work Title Predicted Separation of Acid Gases from Gas Mixtures by Functionalized Porous Aromatic Frameworks
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Open Access
Creators
  1. Yuxiang Wang
  2. Chang Han
  3. Susan B. Sinnott
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Langmuir
Publication Date March 8, 2024
Publisher Identifier (DOI)
  1. https://doi.org/10.1021/acs.langmuir.3c03169
Deposited January 10, 2025

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Version 1
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  • Created
  • Updated
  • Added Creator Yuxiang Wang
  • Added Creator Chang Han
  • Added Creator Susan B. Sinnott
  • Updated Keyword, Publisher, Publisher Identifier (DOI), and 2 more Show Changes
    Keyword
    • Gas Mixture, Functional Group, Selective Adsorption, Gas Adsorption, Maximum Adsorption, High Adsorption, Carbon Dioxide, Gas Absorption, Functional Groups, Adsorption, Gas Loading, Gas Selectivity, High Pressure, Nitrogen Gas, Small Molecular, Two Electron, Gas Constant, Molecular Concentration, C4f7n/Co2, Ring Porous, Electron Donating Groups, Framework Materials, High Selectivity, Low Pressure, Binary Mixture, Elevated Pressure, Adsorption Capacity, Electron Withdrawing Group, Simulation Procedure, Binary Gas Mixtures, Grand Canonical Monte Carlo, Porous Materials, Aromatic Ring, Gas Molecules
    Publisher
    • Langmuir
    Publisher Identifier (DOI)
    • https://doi.org/10.1021/acs.langmuir.3c03169
    Description
    • <p>The selective adsorption of target acid gas molecules from binary gas mixtures by porous aromatic frameworks (PAFs) with two identical functional groups per aromatic ring (PAF-R<sub>2</sub>) was computationally investigated using grand canonical Monte Carlo simulations. PAF-R<sub>2</sub> adsorption was considered for three binary mixtures of small molecular concentrations of acid gas and abundant nitrogen gas (CO<sub>2</sub>/N<sub>2</sub>, SO<sub>2</sub>/N<sub>2</sub>, and H<sub>2</sub>S/N<sub>2</sub>). The results indicate that additional functional groups enhance acid gas loadings and selectivity, compared with pristine PAF and single-functionalized PAFs. Low pressures yield linearly increasing gas loadings and constant selectivity, while high pressures yield much higher adsorption and selectivity. In particular, SO<sub>2</sub> loading and selectivity under high pressures are heavily influenced by the PAF’s maximum adsorption limit, which can be linked back to the functional groups and their configuration. In summary, PAF-(3,5)-(COOH)<sub>2</sub> (nomenclature of PAFs is provided in the Appendix in the Supporting Information) and many other PAF with the same two electron-withdrawing groups are predicted to have great acid gas adsorption and selectivity from gas mixtures, while PAF-(3,5)-(OH)<sub>2</sub> (one of PAFs with two identical electron-donating groups) is predicted to have good adsorption and selectivity, especially under elevated pressures. The results of this work can provide insights into various types of PAFs with great selective adsorption ability and their corresponding conditions. The simulation procedures and results may inspire the exploration and screening of other types of PAFs or porous materials, for acid gas absorption.</p>
    Publication Date
    • 2024-03-19
  • Updated
  • Updated Keyword, Publication Date Show Changes
    Keyword
    • Gas Mixture, Functional Group, Selective Adsorption, Gas Adsorption, Maximum Adsorption, High Adsorption, Carbon Dioxide, Gas Absorption, Functional Groups, Adsorption, Gas Loading, Gas Selectivity, High Pressure, Nitrogen Gas, Small Molecular, Two Electron, Gas Constant, Molecular Concentration, C4f7n/Co2, Ring Porous, Electron Donating Groups, Framework Materials, High Selectivity, Low Pressure, Binary Mixture, Elevated Pressure, Adsorption Capacity, Electron Withdrawing Group, Simulation Procedure, Binary Gas Mixtures, Grand Canonical Monte Carlo, Porous Materials, Aromatic Ring, Gas Molecules
    Publication Date
    • 2024-03-19
    • 2024-03-08
  • Updated Creator Yuxiang Wang
  • Updated Creator Chang Han
  • Updated Creator Susan B. Sinnott
  • Added Supporting_Information.Final.pdf
  • Added Manuscript.Cleaned.Final.pdf
  • Updated License Show Changes
    License
    • https://rightsstatements.org/page/InC/1.0/
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