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Comparison of hydroxide‐based adsorbents of Mg(OH)2 and Ca(OH)2 for CO2 capture: utilization of response surface methodology, kinetic, and isotherm modeling

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  • Ahad Ghaemi
  • Amir Hossein Behroozi

Abstract

CO2 capture using hydroxide‐based adsorbents is studied experimentally for two adsorbents of Mg(OH)2 and Ca(OH)2. The adsorbents are characterized before and after the adsorption process by X‐ray diffraction and Fourier transform infrared spectroscopy analyses. The experiments were carried out in the ranges of 25–65°C, 2–10 bar, and 0.5–2.5 g for temperature, initial pressure, and weight of adsorbent, respectively. Based on the response surface methodology with a central composite design approach, predicted CO2 adsorption capacities are fitted well with R2 values of 0.981 and 0.929 for Mg(OH)2 and Ca(OH)2, respectively. The Freundlich isotherm model with R2 values of 0.985 and 0.994 is the best model for adsorption capacity prediction of Mg(OH)2 and Ca(OH)2, respectively. Also, the pseudo‐second‐order kinetic model with R2 values more than 0.98 is selected as the best model for both adsorbents. From the thermodynamic parameters, the reactive adsorption process is found to be exothermic and spontaneous. Due to higher adsorption percentage and capacity at the same conditions, Ca(OH)2 is more efficient than Mg(OH)2 for CO2 capture at studied ranges. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

Suggested Citation

  • Ahad Ghaemi & Amir Hossein Behroozi, 2020. "Comparison of hydroxide‐based adsorbents of Mg(OH)2 and Ca(OH)2 for CO2 capture: utilization of response surface methodology, kinetic, and isotherm modeling," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 10(5), pages 948-964, October.
    • Handle: RePEc:wly:greenh:v:10:y:2020:i:5:p:948-964
    DOI: 10.1002/ghg.2015
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    References listed on IDEAS

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    1. Tan, Y.L. & Islam, Md. Azharul & Asif, M. & Hameed, B.H., 2014. "Adsorption of carbon dioxide by sodium hydroxide-modified granular coconut shell activated carbon in a fixed bed," Energy, Elsevier, vol. 77(C), pages 926-931.
    2. Fatemeh Fashi & Ahad Ghaemi & Peyman Moradi, 2019. "Piperazine‐modified activated alumina as a novel promising candidate for CO2 capture: experimental and modeling," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 9(1), pages 37-51, February.
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