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Constant rate thermal analysis for enhancing the long-term CO2 capture of CaO at Ca-looping conditions

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  • Valverde, Jose M.
  • Sanchez-Jimenez, Pedro E.
  • Perejon, Antonio
  • Perez-Maqueda, Luis A.

Abstract

Experimental results are reported on the (Ca-looping) multicyclic CO2 capture of CaO and nanosilica/CaO composites derived from Ca(OH)2 and nanosilica/Ca(OH)2 dry mixtures subjected in situ to linear and constant rate thermal analysis (CRTA) preheating programs in either air or air/CO2 atmospheres. By means of CRTA preheating the rates of the reactions taking place during pretreatment are kept at a constant and small value along the entire process. In agreement with a pore skeleton model, previously proposed in the literature for explaining the behavior of natural limestones thermally pretreated, our results suggest that air/CO2-CRTA pretreatment yields a thermally stable hard skeleton of poorly reactive CaO on which a soft skeleton of reactive CaO would be supported. The sorbent subjected to this preheating program exhibits a reactivation in the very first carbonation/calcination cycles, after which CaO conversion decays slowly with the cycle number. In contrast, linearly or air-CRTA preheated sorbents show a significant decrease of CaO conversion within the first cycles. In the latter case, CaO multicyclic conversion fits well to a model where it is assumed that the progressive reduction of surface area as the number of carbonation/calcination cycles is increased obeys to sintering of the preheated sorbent skeleton as it is subjected to repeated calcinations during cycling. In the former case, CaO conversion data conforms to the prediction by a model in which the loss of surface area is mainly due to sintering of a nascent CaO soft skeleton regenerated in the diffusive carbonation phase, which is enhanced by the air/CO2-CRTA pretreatment. As regards the effect of nanosilica, the results indicate that it slows down CaO sintering during pretreatment, which hinders the development of a stable CaO skeleton thus hampering reactivation and stabilization of conversion. On the other hand, as CaO sintering is also lessened during looping calcination, nanosilica is useful to increase the absolute values of CaO conversion.

Suggested Citation

  • Valverde, Jose M. & Sanchez-Jimenez, Pedro E. & Perejon, Antonio & Perez-Maqueda, Luis A., 2013. "Constant rate thermal analysis for enhancing the long-term CO2 capture of CaO at Ca-looping conditions," Applied Energy, Elsevier, vol. 108(C), pages 108-120.
    • Handle: RePEc:eee:appene:v:108:y:2013:i:c:p:108-120
    DOI: 10.1016/j.apenergy.2013.03.013
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    1. Lisbona, Pilar & Martínez, Ana & Romeo, Luis M., 2013. "Hydrodynamical model and experimental results of a calcium looping cycle for CO2 capture," Applied Energy, Elsevier, vol. 101(C), pages 317-322.
    2. Chen, Huichao & Zhao, Changsui & Yang, Yanmei & Zhang, Pingping, 2012. "CO2 capture and attrition performance of CaO pellets with aluminate cement under pressurized carbonation," Applied Energy, Elsevier, vol. 91(1), pages 334-340.
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    6. Lara, Yolanda & Lisbona, Pilar & Martínez, Ana & Romeo, Luis M., 2013. "Design and analysis of heat exchanger networks for integrated Ca-looping systems," Applied Energy, Elsevier, vol. 111(C), pages 690-700.
    7. Valverde, J.M. & Sanchez-Jimenez, P.E. & Perez-Maqueda, L.A., 2014. "Calcium-looping for post-combustion CO2 capture. On the adverse effect of sorbent regeneration under CO2," Applied Energy, Elsevier, vol. 126(C), pages 161-171.
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    10. Perejón, Antonio & Romeo, Luis M. & Lara, Yolanda & Lisbona, Pilar & Martínez, Ana & Valverde, Jose Manuel, 2016. "The Calcium-Looping technology for CO2 capture: On the important roles of energy integration and sorbent behavior," Applied Energy, Elsevier, vol. 162(C), pages 787-807.
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    12. Li, Yingjie & Su, Mengying & Xie, Xin & Wu, Shuimu & Liu, Changtian, 2015. "CO2 capture performance of synthetic sorbent prepared from carbide slag and aluminum nitrate hydrate by combustion synthesis," Applied Energy, Elsevier, vol. 145(C), pages 60-68.
    13. Zhang, Zhonghua & Wang, Baodong & Sun, Qi & Zheng, Lingru, 2014. "A novel method for the preparation of CO2 sorption sorbents with high performance," Applied Energy, Elsevier, vol. 123(C), pages 179-184.
    14. Witoon, Thongthai & Mungcharoen, Thumrongrut & Limtrakul, Jumras, 2014. "Biotemplated synthesis of highly stable calcium-based sorbents for CO2 capture via a precipitation method," Applied Energy, Elsevier, vol. 118(C), pages 32-40.
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    16. Chen, Huichao & Zhao, Changsui & Yu, Weiwei, 2013. "Calcium-based sorbent doped with attapulgite for CO2 capture," Applied Energy, Elsevier, vol. 112(C), pages 67-74.
    17. Shi, Jiewen & Li, Yingjie & Zhang, Qing & Ma, Xiaotong & Duan, Lunbo & Zhou, Xingang, 2017. "CO2 capture performance of a novel synthetic CaO/sepiolite sorbent at calcium looping conditions," Applied Energy, Elsevier, vol. 203(C), pages 412-421.
    18. 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).
    19. Valverde, J.M. & Sanchez-Jimenez, P.E. & Perez-Maqueda, L.A. & Quintanilla, M.A.S. & Perez-Vaquero, J., 2014. "Role of crystal structure on CO2 capture by limestone derived CaO subjected to carbonation/recarbonation/calcination cycles at Ca-looping conditions," Applied Energy, Elsevier, vol. 125(C), pages 264-275.
    20. Zhang, Wan & Li, Yingjie & He, Zirui & Ma, Xiaotong & Song, Haiping, 2017. "CO2 capture by carbide slag calcined under high-concentration steam and energy requirement in calcium looping conditions," Applied Energy, Elsevier, vol. 206(C), pages 869-878.
    21. Sanchez-Jimenez, P.E. & Perez-Maqueda, L.A. & Valverde, J.M., 2014. "Nanosilica supported CaO: A regenerable and mechanically hard CO2 sorbent at Ca-looping conditions," Applied Energy, Elsevier, vol. 118(C), pages 92-99.
    22. Valverde, J.M. & Sanchez-Jimenez, P.E. & Perez-Maqueda, L.A., 2014. "Role of precalcination and regeneration conditions on postcombustion CO2 capture in the Ca-looping technology," Applied Energy, Elsevier, vol. 136(C), pages 347-356.

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