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The Reinforced Separation of Intractable Gas Mixtures by Using Porous Adsorbents.

Quanli Ke1, Feng Xiong1, Guonan Fang1

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Advanced Materials (Deerfield Beach, Fla.)
|August 20, 2024
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This review explores porous adsorbents for challenging gas separations like carbon capture. Functionalization strategies enhance adsorption, improving separation efficiency for various gas mixtures.

Keywords:
functionalization strategiesintractable gas mixtureporous adsorbentsseparation mechanismstructure‐activity relationship

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Intractable gas separation is crucial for environmental and industrial applications.
  • Porous adsorbents offer tunable properties for selective gas adsorption.
  • Existing methods face challenges in efficiency and selectivity for complex mixtures.

Purpose of the Study:

  • To review mechanisms and driving forces in intractable gas separation using porous adsorbents.
  • To categorize separation systems based on adsorbate properties and separation goals.
  • To highlight functionalization strategies for enhancing adsorbent performance.

Main Methods:

  • Categorization of separation systems by adsorbate properties (kinetic diameter, dipole moment, polarizability).
  • Analysis of separation occasions (e.g., CO2 capture) and driving forces (thermodynamic, kinetic, molecular sieving).
  • Review of functionalization strategies for porous materials (carbons, zeolites, MOFs).

Main Results:

  • Functionalization strategies significantly enhance adsorption capacity, selectivity, and stability.
  • Tailoring porous materials improves performance for specific gas mixtures like CO2.
  • Different porous materials (carbons, zeolites, MOFs) require distinct functionalization approaches.

Conclusions:

  • Porous adsorbents, when appropriately functionalized, are effective for intractable gas separations.
  • Combining theoretical calculations with experimental optimization can accelerate adsorbent discovery.
  • Future research should focus on deeper understanding of adsorption forces and material design.