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Removal of low concentration CO2 at ambient temperature using several potassium-based sorbents

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  • Zhao, Chuanwen
  • Guo, Yafei
  • Li, Changhai
  • Lu, Shouxiang

Abstract

The requirement for long-duration human operation in a confined space has made removal of low concentration CO2 a critical technology. The incorporation of organic amines into a porous support is thought to be a promising approach, but the low amine utilization ratio and the loss of amine components due to evaporation in regeneration process make it necessary to try new sorbents. As K2CO3 are more difficult to be decomposed than organic amine compound, potassium-based sorbents may be more effective for CO2 removal in confined spaces. In this work, activated carbon (AC), Al2O3, zeolite 5A, zeolite 13X, and silica aerogels (SG) were chosen as the supports and K2CO3 was provided as the active component. An experimental demonstration of the CO2 sorption performances of these sorbents was present in detail in the condition of ambient temperature and the CO2 concentration of 5000ppm. The CO2 sorption capacities are calculated as 0.87, 1.18, 0.34, 0.53, and 0.15mmol CO2/g for K2CO3/AC, K2CO3/Al2O3, K2CO3/5A, K2CO3/13X, and K2CO3/SG, respectively. The reacted products are completely regenerated in the temperature range of 100–200°C for K2CO3/AC and K2CO3/SG. Other sorbents, however, require a higher temperature of 350°C in order to be regenerated. K2CO3/Al2O3 shows the highest CO2 sorption capacity, while K2CO3/AC shows the highest bi-carbonation conversion efficiency. The CO2 sorption capacities of K2CO3/5A, K2CO3/13X, and K2CO3/SG do not reach the expected values. Among these sorbents, K2CO3/AC is a new, more efficacious choice for CO2 removal in confined space at ambient temperature.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:124:y:2014:i:c:p:241-247
    DOI: 10.1016/j.apenergy.2014.02.054
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    Cited by:

    1. 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).
    2. Yaumi, A.L. & Bakar, M.Z. Abu & Hameed, B.H., 2017. "Reusable nitrogen-doped mesoporous carbon adsorbent for carbon dioxide adsorption in fixed-bed," Energy, Elsevier, vol. 138(C), pages 776-784.
    3. Guo, Yafei & Zhao, Chuanwen & Chen, Xiaoping & Li, Changhai, 2015. "CO2 capture and sorbent regeneration performances of some wood ash materials," Applied Energy, Elsevier, vol. 137(C), pages 26-36.
    4. Qin, Changlei & Yin, Junjun & Ran, Jingyu & Zhang, Li & Feng, Bo, 2014. "Effect of support material on the performance of K2CO3-based pellets for cyclic CO2 capture," Applied Energy, Elsevier, vol. 136(C), pages 280-288.
    5. Sanna, Aimaro & Ramli, Ili & Mercedes Maroto-Valer, M., 2015. "Development of sodium/lithium/fly ash sorbents for high temperature post-combustion CO2 capture," Applied Energy, Elsevier, vol. 156(C), pages 197-206.
    6. Kong, Yong & Shen, Xiaodong & Cui, Sheng & Fan, Maohong, 2015. "Development of monolithic adsorbent via polymeric sol–gel process for low-concentration CO2 capture," Applied Energy, Elsevier, vol. 147(C), pages 308-317.

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