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 Mechanism of the H2O(g) release during a dehydroxylation of montmorillonite

I. Horváth and Ľ. Gáliková

Institute of Inorganic Chemistry, Slovak Academy of Sciences, 809 34 Bratislava


Abstract: The mechanism of H2O release during the dehydroxylation of a std. sample of montmorillonite, transformed into Li, Na, K, Cs, Ca, Mg, and Ba monoionic forms, was investigated by an isothermal thermogravimetric method. The dehydroxylation of montmorillonite can be influenced by the kind of the exchangeable ion. The monoionic forms with monovalent exchangeable cations, excepting the Na form, released H2O according to the mechanism of the 1st-order kinetics. The diffusion of H2O mols. from phase boundaries was the rate-controlling process for divalent cations and Na+ in the interlayer region. It can be assumed that the H2O transport through the interlayer region into the environment is decisively influenced by the strength of the electrostatic forces between the cation and the neg. charged O atoms of the structure.

Full paper in Portable Document Format: 335a604.pdf


Chemical Papers 33 (5) 604–611 (1979)

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