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CO2 adsorption and dehydration behavior of LiNaX, KNaX, CaNaX and CeNaX zeolites

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Abstract

In this study, NaX synthetic zeolite was modified by following the conventional cation exchange method at 70°C. 82, 81, 79 and 48% of sodium were exchanged with Li+, K+, Ca2+ and Ce3+, respectively. Thermal analysis data obtained by TG/DSC was used to evaluate the dehydration behavior of the zeolites. The strongest interaction with water and the highest dehydration enthalpy (ΔH) value were found for Li-exchanged form and compared with the other forms. The temperature required for complete dehydration increased with decreasing cation size (cation size: K+>Ce3+>Ca2+>Na+>Li+). CO2 adsorption at 5 and 25°C was also studied and the virial model equation was used to analyze the experimental data to calculate the Henry’s law constant, K o and isosteric heat of adsorption at zero loading Q st. K o values decreased with increasing temperature and the highest Qst was obtained for K rich zeolite. It was observed that both dehydration and CO2 adsorption properties are related to cation introduced into zeolite structure.

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Authors and Affiliations

  1. Department of Chemical Engineering, Izmir Institute of Technology, Urla, İzmir, Turkey

    Y. Erten, A. Güneş-Yerkesikli, A. E. Çetin & F. Çakιcιoǧlu-Özkan

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  1. Y. Erten
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  2. A. Güneş-Yerkesikli
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  3. A. E. Çetin
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  4. F. Çakιcιoǧlu-Özkan
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Correspondence to F. Çakιcιoǧlu-Özkan.

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Erten, Y., Güneş-Yerkesikli, A., Çetin, A.E. et al. CO2 adsorption and dehydration behavior of LiNaX, KNaX, CaNaX and CeNaX zeolites. J Therm Anal Calorim 94, 715–718 (2008). https://doi.org/10.1007/s10973-008-9117-9

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  • DOI: https://doi.org/10.1007/s10973-008-9117-9

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