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Study on CO2 adsorption capacity and kinetic mechanism of CO2 adsorbent prepared from fly ash

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  • Guo, Baihe
  • Zhang, Jingchao
  • Wang, Yanlin
  • Qiao, Xiaolei
  • Xiang, Jun
  • Jin, Yan

Abstract

The use of fly ash from coal-fired power plants for CO2 adsorption can reduce CO2 emissions and CO2 capture costs while making efficient use of power plant solid waste. In this study, fly ash was used to prepare aerogel support with good microstructure, and the support was impregnated with an incipient wetness impregnation method to make CO2 adsorbent. Adsorption experiments of CO2 adsorbents were carried out in a self-designed small fixed-bed reactor to study the influence of reaction conditions on the adsorption capacity of adsorbents. The results showed that the aerogel support prepared from fly ash had good microscopic properties with specific surface area and specific pore volume were 400 m2/g and 1.9 cm3/g, respectively. The pore structure was uniform, and the proportion of mesopores reached more than 99%. Under the reaction condition of 60 °C reaction temperature, 15% water vapor concentration, 15% CO2 concentration and 500 mL/min total gas flow rate, the maximum adsorption capacity of KA-30 adsorbent was 2.02 mmol/g. Avrami fractional kinetics model was used to calculate the cumulative adsorption capacity to study the adsorption kinetics. Combined with mass transfer kinetic model and deactivation model, the experimental breakthrough curve was fitted to study the adsorption mechanism of the adsorbent.

Suggested Citation

  • Guo, Baihe & Zhang, Jingchao & Wang, Yanlin & Qiao, Xiaolei & Xiang, Jun & Jin, Yan, 2023. "Study on CO2 adsorption capacity and kinetic mechanism of CO2 adsorbent prepared from fly ash," Energy, Elsevier, vol. 263(PB).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pb:s0360544222026500
    DOI: 10.1016/j.energy.2022.125764
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    References listed on IDEAS

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    1. Dang Viet Quang & Abdallah Dindi & Aravind V Rayer & Nabil El Hadri & Abdurahim Abdulkadir & Mohammad R.M. Abu‐Zahra, 2015. "Effect of moisture on the heat capacity and the regeneration heat required for CO 2 capture process using PEI impregnated mesoporous precipitated silica," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 5(1), pages 91-101, February.
    2. Liu, Yamin & Yu, Xiaojing, 2018. "Carbon dioxide adsorption properties and adsorption/desorption kinetics of amine-functionalized KIT-6," Applied Energy, Elsevier, vol. 211(C), pages 1080-1088.
    3. Lee, Jaehee & Han, Sang-Jun & Wee, Jung-Ho, 2014. "Synthesis of dry sorbents for carbon dioxide capture using coal fly ash and its performance," Applied Energy, Elsevier, vol. 131(C), pages 40-47.
    4. Zhao, Chuanwen & Guo, Yafei & Li, Changhai & Lu, Shouxiang, 2014. "Removal of low concentration CO2 at ambient temperature using several potassium-based sorbents," Applied Energy, Elsevier, vol. 124(C), pages 241-247.
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    Cited by:

    1. Long Jiang & Liang Cheng & Yuxuan Zhang & Gaojun Liu & Jian Sun, 2023. "A Review on CO 2 Sequestration via Mineralization of Coal Fly Ash," Energies, MDPI, vol. 16(17), pages 1-24, August.
    2. Farihahusnah Hussin & Nur Nadira Hazani & Mohamed Kheireddine Aroua, 2023. "The Effect of Physicochemical Properties and Surface Chemistry on CO 2 Adsorption Capacity of Potassium Acetate-Treated Carbon Pellets," Sustainability, MDPI, vol. 15(6), pages 1-21, March.

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