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Nanosilica supported CaO: A regenerable and mechanically hard CO2 sorbent at Ca-looping conditions

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

Abstract

This work presents a CO2 sorbent that may be synthesized from low-cost and widely available materials following a simple method basically consisting of impregnation of a nanostructured silica support with a saturated solution of calcium nitrate. In a first impregnation stage, the use of a stoichiometric CaO/SiO2 ratio serves to produce a calcium silicate matrix after calcination. This calcium silicate matrix acts as a thermally stable and mechanically hard support for CaO deposited on it by further impregnation. The CaO-impregnated sorbent exhibits a stable CaO conversion at Ca-looping conditions whose value depends on the CaO wt% deposited on the calcium silicate matrix, which can be increased by successive reimpregnations. A 10wt% CaO impregnated sorbent reaches a stable conversion above 0.6 whereas the stable conversion of a 30wt% CaO impregnated sorbent is around 0.3, which is much larger than the residual conversion of CaO derived from natural limestone (between 0.07 and 0.08). Moreover, particle size distribution measurements of samples predispersed in a liquid and subjected to high energy ultrasonic waves indicate that the CaO-impregnated sorbent has a relatively high mechanical strength as compared to limestone derived CaO.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:118:y:2014:i:c:p:92-99
    DOI: 10.1016/j.apenergy.2013.12.024
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    References listed on IDEAS

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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.
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    Keywords

    CO2 capture; Ca-based synthetic sorbents; Ca-looping;
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