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Self-activation of CaO/Ca3Al2O6 sorbents by thermally pretreated in CO2 atmosphere

Author

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  • Jing, Jie-ying
  • Zhang, Xue-wei
  • Li, Qing
  • Li, Ting-yu
  • Li, Wen-ying

Abstract

CaO/Ca3Al2O6 sorbents have been proved to be a promising sorbent for CO2 sorption. However, the sorbents still suffer from low CO2 sorption capacity. In this work, self-activation was generated via thermally pretreating CaO/Ca3Al2O6 sorbents in CO2 atmosphere at various temperatures to enhance the CO2 sorption capacity of CaO/Ca3Al2O6 sorbents. Results showed that the thermally pretreated temperature plays an overwhelming role in the CO2 sorption capacity and stability of the CaO/Ca3Al2O6 sorbents. Superior CO2 sorption capacity (8.01 mmol g−1 for C9A1-650 at 500 °C) is achieved, which is 72% higher than that of C9A1 (no pretreatment sample). After 50 carbonation-calcination cycles, the CO2 sorption capacity of C9A1-650 still remained 20% higher than that of C9A1. The high CO2 sorption capacity is ascribed to the smaller CaO grain size (37.1 nm) and the higher surface area (13.1 m2 g−1), resulting from the self-activation process. Meanwhile, the CO2 cyclic sorption stability is due to the small original surface free energy. Furthermore, the C9A1-650 sorbent is employed to use in sorption enhanced methane steam reforming process. It provides a H2 concentration of 98.9% and CH4 conversion of 98.7%, presenting greatly potential in practical application.

Suggested Citation

  • Jing, Jie-ying & Zhang, Xue-wei & Li, Qing & Li, Ting-yu & Li, Wen-ying, 2018. "Self-activation of CaO/Ca3Al2O6 sorbents by thermally pretreated in CO2 atmosphere," Applied Energy, Elsevier, vol. 220(C), pages 419-425.
    • Handle: RePEc:eee:appene:v:220:y:2018:i:c:p:419-425
    DOI: 10.1016/j.apenergy.2018.03.069
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    References listed on IDEAS

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    1. Zhao, Yunlei & Jin, Bo & Luo, Xiao & Liang, Zhiwu, 2021. "Thermodynamic evaluation and experimental investigation of CaO-assisted Fe-based chemical looping reforming process for syngas production," Applied Energy, Elsevier, vol. 288(C).

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