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Studies on the equilibrated thermodesorption of n-hexane from ZSM-5 zeolite

The influence of the extraframework cations

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Abstract

Equilibrated thermodesorption (TPED) and quasi-equilibrated temperature programmed desorption and adsorption (QE-TPDA) were employed as methods for studying the influence of different extraframework cations (Na+, K+, Li+, Cu2+, Zn2+, or Mg2+) on adsorption of n-hexane on ZSM-5 zeolite with high Al content (Si/Al = 15). Considerable influence of the cations on both initial adsorption in the micropores and ordering of the adsorbed molecules, occurring at high coverages, has been observed. This influence is reflected by the values of the adsorption enthalpy and entropy, determined by fitting the dual site Langmuir (DSL) adsorption function to the equilibrated thermodesorption profiles. However, no clear correlation between the determined parameters and properties of the extraframework cations could be found.

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Acknowledgements

The authors thank the Polish Ministry of Science and Higher Education for financial support (grant number N507 108 32/3175).

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  1. Department of Chemistry, The Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland

    Dorota Majda & Wacław Makowski

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  1. Dorota Majda
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  2. Wacław Makowski
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Correspondence to Dorota Majda.

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Majda, D., Makowski, W. Studies on the equilibrated thermodesorption of n-hexane from ZSM-5 zeolite. J Therm Anal Calorim 101, 519–526 (2010). https://doi.org/10.1007/s10973-010-0832-7

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