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Dehydration kinetics of the microporous zirconosilicate elpidite

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Abstract

The dehydration kinetics of natural elpidite, Na2ZrSi6O15 · 3H2O, have been studied by isothermal (110–254°C) and nonisothermal (20–600°C) thermogravimetry. The process comprises two steps. In the first step, 50% of the water is released according to a first-order rate law with a rate constant k 1 = 108.9 ± 0.2 exp[(−98740 ± 3100)/RT] s−1 (R = 8.314 J/(mol K)). The second dehydration step cannot be described by a simple kinetic law. The effective activation energy for this step (76.5 kJ/mol) has been evaluated from the temperature dependence of its initial rate. The results on the dehydration kinetics of elpidite are discussed in relation to the structural transformations of the framework and the hydrogen bonds formed by the water molecules in the zeolite channels.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, pr. Akademika Semenova 1, Chernogolovka, Moscow oblast, 142432, Russia

    V. V. Nedel’ko & N. V. Chukanov

  2. Moscow State University, Moscow, 119899, Russia

    I. V. Pekov

Authors
  1. V. V. Nedel’ko
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  2. N. V. Chukanov
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  3. I. V. Pekov
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Correspondence to N. V. Chukanov.

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Original Russian Text © V.V. Nedel’ko, N.V. Chukanov, I.V. Pekov, 2011, published in Neorganicheskie Materialy, 2011, Vol. 47, No. 5, pp. 570–574.

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Nedel’ko, V.V., Chukanov, N.V. & Pekov, I.V. Dehydration kinetics of the microporous zirconosilicate elpidite. Inorg Mater 47, 502–505 (2011). https://doi.org/10.1134/S0020168511050165

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  • DOI: https://doi.org/10.1134/S0020168511050165

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