Effect of pH-controlled synthesis on the physical properties and intermediate-temperature CO2 sorption behaviors of K-Mg double salt-based sorbents

Chan Hyun Lee, Hyuk Jae Kwon, Hyun Chul Lee, Soonchul Kwon, Sang Goo Jeon, Ki Bong Lee

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28 Citations (Scopus)


High-temperature CO2 sorption has been investigated as a new CO2 capture technology, and the development of high-temperature CO2 sorbents is critically important for the realization of this technology. In this study, K-Mg double salt-based sorbents were synthesized using a new pH-controlled precipitation method and the prepared sorbents were tested for medium high (intermediate) temperature CO2 sorption. In the new method for the synthesis of K-Mg double salt-based sorbents, the pH of the reagent solution was controlled by adding K2CO3 and/or KOH, resulting in varied ratios of different components in the sorbent. The CO2 sorption ability was enhanced in K-Mg double salt-based sorbents synthesized using the new pH-controlled method compared to the samples synthesized by the conventional precipitation method. The newly prepared K-Mg double salt-based sorbents had a high CO2 sorption uptake of up to 2.09 mol kg-1 at 300 °C and 1 bar. In addition, they showed fast sorption kinetics and good cyclic stability during multiple sorption/desorption procedures.

Original languageEnglish
Pages (from-to)439-446
Number of pages8
JournalChemical Engineering Journal
Publication statusPublished - 2016 Jun 15


  • Double salt-based sorbent
  • Intermediate-temperature CO
  • PH-controlled precipitation synthesis
  • Sorption

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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