Sorption Equilibria and Kinetics of CO 2 , N 2 , and H 2 O on KOH-Treated Activated Carbon

Lei Liu, Seongmin Jin, Yongha Park, Young Cheol Park, Chang Ha Lee

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Abstract

The equilibria and kinetics of CO 2 , N 2 , and H 2 O on KOH-treated activated carbon (KOH-AC) were evaluated. The isotherms for the pure components were correlated with the Langmuir, dual-site Langmuir, Sips, and Brunauer-Emmett-Teller models. The saturated adsorption amounts followed the order qH2O > qCO2 ≫ qN2. When simulated gas composition of postcombustion CO 2 capture (15 vol % CO 2 , 4 vol % H 2 O, and balanced N 2 ) was simulated by the ideal adsorption solution theory, the adsorbed amount of H 2 O was much higher than those of CO 2 and N 2 . The adsorption amount of CO 2 dropped when H 2 O was present. The CO 2 uptake curves were well correlated with a nonisothermal kinetic model because the adsorption kinetics were controlled via heat generation and transfer. At the same temperature and pressure, the adsorption rates followed the order H 2 O > CO 2 > N 2 . Understanding the adsorption behaviors of flue gas including H 2 O is important in designing adsorptive CO 2 capture processes using KOH-AC.

Original languageEnglish
Pages (from-to)17218-17225
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume57
Issue number50
DOIs
Publication statusPublished - 2018 Dec 19

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All Science Journal Classification (ASJC) codes

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

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