We investigated each of the successive transformations of this material using calculations based on DFT. Possible structures produced from three reaction steps of the thermal treatment were simulated. Thermodynamic analysis was performed to assess the energy stability of each reaction. The dehydration of the interlamellar region confirmed the selective loss of water molecules, with axial HO being responsible for the first part of the mass loss experimentally observed in TG-DTA while the loss of equatorial HO molecules is observed above 150 °C. The reactions of the proposed intermediates after dehydration indicated that the formation of a zeolite SiO is thermodynamically unfavorable in relation to zeolite sodium silicate. Kinetic effects and new heat treatment protocols should be studied to improve the understanding of these materials. The final steps indicated that after the condensation of the layers, sodium silicate was formed together with quartz.
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