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<p>The emission of carbon dioxide (CO₂) is a critical factor driving climate change, prompting the development of advanced capture technologies. In this study, GIS (zeolite P) and composite GIS–FAU (ZPY) zeolites were synthesized and exchanged with various cations (Na⁺, K⁺, Mg²⁺, Ca²⁺, Sr²⁺, NH₄⁺) to investigate their CO₂ adsorption capacity. Structural analyses via X-ray diffraction (XRD) and SEM–EDS confirmed successful modification of zeolite by ion-exchanging and preserved crystallinity. Among the tested samples, ZPY-K exhibited the highest CO₂ uptake at 30&#xa0;°C, outperforming other variants such as ZPY-Sr and ZPY-NH₄. N₂ adsorption–desorption showed that ZPY-K retained a high surface area (284&#xa0;m²/g) and suitable porosity. Moisture adsorption tests revealed improved hydrophobicity in the two-phase ZPY composites, making moisture less competing with carbon dioxide adsorption. The findings highlight the critical role of cation type and framework structure in tuning adsorption behavior and confirm potassium-exchanged GIS–FAU zeolite as a promising material for efficient and regenerable CO₂ capture at low pressure.</p>

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Enhancing CO2 Adsorption via Metal Cation Exchange of GIS and GIS–FAU Zeolites

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Vo Tran Minh Khoa,
  • Nguyen Manh Khang,
  • Bach Ngoc Nguyen Duy,
  • Nguyen Thi Truc Phuong,
  • Ngo Tran Hoang Duong,
  • Nguyen Quang Long

摘要

The emission of carbon dioxide (CO₂) is a critical factor driving climate change, prompting the development of advanced capture technologies. In this study, GIS (zeolite P) and composite GIS–FAU (ZPY) zeolites were synthesized and exchanged with various cations (Na⁺, K⁺, Mg²⁺, Ca²⁺, Sr²⁺, NH₄⁺) to investigate their CO₂ adsorption capacity. Structural analyses via X-ray diffraction (XRD) and SEM–EDS confirmed successful modification of zeolite by ion-exchanging and preserved crystallinity. Among the tested samples, ZPY-K exhibited the highest CO₂ uptake at 30 °C, outperforming other variants such as ZPY-Sr and ZPY-NH₄. N₂ adsorption–desorption showed that ZPY-K retained a high surface area (284 m²/g) and suitable porosity. Moisture adsorption tests revealed improved hydrophobicity in the two-phase ZPY composites, making moisture less competing with carbon dioxide adsorption. The findings highlight the critical role of cation type and framework structure in tuning adsorption behavior and confirm potassium-exchanged GIS–FAU zeolite as a promising material for efficient and regenerable CO₂ capture at low pressure.