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 k1 = 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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