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Role of crystal structure on CO2 capture by limestone derived CaO subjected to carbonation/recarbonation/calcination cycles at Ca-looping conditions

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  • Valverde, J.M.
  • Sanchez-Jimenez, P.E.
  • Perez-Maqueda, L.A.
  • Quintanilla, M.A.S.
  • Perez-Vaquero, J.

Abstract

Large scale pilot plants are currently demonstrating the feasibility of the Calcium-looping (CaL) technology built on the multicyclic calcination/carbonation of natural limestone for post-combustion and pre-combustion CO2 capture. Yet, limestone derived CaO exhibits a drop of conversion when subjected to multiple carbonation/calcination cycles, which lessens the efficiency of the technology. In this paper we analyze a novel CaL concept recently proposed to mitigate this drawback based on the introduction of an intermediate stage wherein carbonation is intensified at high temperature and high CO2 partial pressure. It is shown that carbonation in this stage is mainly driven by solid-state diffusion, which is determined by the solid’s crystal structure. Accordingly, a reduction of crystallinity by ball milling, which favors diffusion, serves to promote recarbonation. Conversely, thermal annealing, which enhances crystallinity, hinders recarbonation. An initial fast phase has been identified in the recarbonation stage along which the rate of carbonation is also a function of the crystal structure indicating a relevant role of surface diffusion. This is consistent with a recently proposed mechanism for nucleation of CaCO3 on the CaO surface in islands with a critical size determined by surface diffusion. A further issue analyzed has been the effects of pretreatment and cycling on the mechanical strength of the material, whose fragility hampers the CaL process efficiency. Particle size distribution of samples dispersed in a liquid and subjected to high energy ultrasonic irradiation indicate that milling promotes friability whereas thermal annealing enhances the resistance of the particles to fragmentation even though pretreatment effects become blurred after cycling. Our study demonstrates that recarbonation conditions and crystal-structure controlled diffusion are important parameters to be considered in order to assess the efficiency of CO2 capture in the novel CaL concept.

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  • 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.
  • Handle: RePEc:eee:appene:v:125:y:2014:i:c:p:264-275
    DOI: 10.1016/j.apenergy.2014.03.065
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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, Shiyi & Xiang, Wenguo & Wang, Dong & Xue, Zhipeng, 2012. "Incorporating IGCC and CaO sorption-enhanced process for power generation with CO2 capture," Applied Energy, Elsevier, vol. 95(C), pages 285-294.
    3. 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.
    4. 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.
    5. 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.
    6. Wang, Jinsheng & Manovic, Vasilije & Wu, Yinghai & Anthony, Edward J., 2010. "A study on the activity of CaO-based sorbents for capturing CO2 in clean energy processes," Applied Energy, Elsevier, vol. 87(4), pages 1453-1458, April.
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    1. Xie, Xin & Li, Yingjie & Wang, Wenjing & Shi, Lei, 2014. "HCl removal using cycled carbide slag from calcium looping cycles," Applied Energy, Elsevier, vol. 135(C), pages 391-401.
    2. Sánchez Jiménez, Pedro E. & Perejón, Antonio & Benítez Guerrero, Mónica & Valverde, José M. & Ortiz, Carlos & Pérez Maqueda, Luis A., 2019. "High-performance and low-cost macroporous calcium oxide based materials for thermochemical energy storage in concentrated solar power plants," Applied Energy, Elsevier, vol. 235(C), pages 543-552.
    3. Gao, Jubao & Cao, Lingdi & Dong, Haifeng & Zhang, Xiangping & Zhang, Suojiang, 2015. "Ionic liquids tailored amine aqueous solution for pre-combustion CO2 capture: Role of imidazolium-based ionic liquids," Applied Energy, Elsevier, vol. 154(C), pages 771-780.
    4. 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.
    5. Valverde, J.M. & Sanchez-Jimenez, P.E. & Perez-Maqueda, L.A., 2015. "Ca-looping for postcombustion CO2 capture: A comparative analysis on the performances of dolomite and limestone," Applied Energy, Elsevier, vol. 138(C), pages 202-215.
    6. 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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    Keywords

    CO2 capture; Solid sorbents; Ca-looping;
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