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Novel method for investigation of a K–Mg-based CO2 sorbent for sorption-enhanced water–gas shift reaction

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  • Byun, Chang Ki
  • Kwon, Soon Jin
  • Im, Hyo Bin
  • Ahn, Hee Sung
  • Ryu, Ho Jung
  • Yi, Kwang Bok

Abstract

CO2 sorption reactions at 20 bar and two different temperatures (i.e., 180 and 220 °C) using a K–Mg-based CO2 sorbent were carried out in a custom-designed high-pressure thermogravimetric analyzer (pressurized bubbling fluidized bed reactor on a scale) coupled with a gas chromatograph. The experimental apparatus, including the thermogravimetric analyzer, was custom-designed to measure weight changes caused by either CO2 sorption or water sorption or both. Analysis of the CO2 sorption reaction revealed that water sorption takes place rapidly with a moderate CO2 sorption rate at the early stage of the reaction. Then, the reaction migrates to CO2 sorption with simultaneous water desorption. Therefore, the mechanism of the CO2 sorption reaction is assumed to consist of fast hydration of K2CO3 and MgO, formation and decomposition of KHCO3, and finally carbonation of Mg(OH)2 resulting in MgCO3 as the main product. K2CO3 is assumed to provide an efficient pathway for CO2 and water to travel into the core region of the sorbent via a reversible reaction between K2CO3 and KHCO3.

Suggested Citation

  • Byun, Chang Ki & Kwon, Soon Jin & Im, Hyo Bin & Ahn, Hee Sung & Ryu, Ho Jung & Yi, Kwang Bok, 2016. "Novel method for investigation of a K–Mg-based CO2 sorbent for sorption-enhanced water–gas shift reaction," Renewable Energy, Elsevier, vol. 87(P1), pages 415-421.
    • Handle: RePEc:eee:renene:v:87:y:2016:i:p1:p:415-421
    DOI: 10.1016/j.renene.2015.10.020
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    1. Wilson, M & Tontiwachwuthikul, P & Chakma, A & Idem, R & Veawab, A & Aroonwilas, A & Gelowitz, D & Barrie, J & Mariz, C, 2004. "Test results from a CO2 extraction pilot plant at boundary dam coal-fired power station," Energy, Elsevier, vol. 29(9), pages 1259-1267.
    2. Descamps, C. & Bouallou, C. & Kanniche, M., 2008. "Efficiency of an Integrated Gasification Combined Cycle (IGCC) power plant including CO2 removal," Energy, Elsevier, vol. 33(6), pages 874-881.
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    1. Theo, Wai Lip & Lim, Jeng Shiun & Hashim, Haslenda & Mustaffa, Azizul Azri & Ho, Wai Shin, 2016. "Review of pre-combustion capture and ionic liquid in carbon capture and storage," Applied Energy, Elsevier, vol. 183(C), pages 1633-1663.

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