Abstract
Thermogravimetric curves were recorded for six smectites; Manito (U.S.A.) and Sampor (U.S.S.R.) nontronites, and Polkville (U.S.A.), Askangel (U.S.S.R.), Jelsovy Potok (C.S̆.A.) and Bakony (Hungary) montmorillonites. Kinetic analysis of the dehydroxylation wave was performed by using the first order equations of Horowitz and Metzger (1963), Coats and Redfem (1964), Dave and Chopra (1966), as well as the method of Šatava and S̆kvara (1969). A unimolecular nucleation mechanism seems to prevail, according to the last method, independent of diffusional effects. Nontronite dehydroxylation is associated with a higher activation energy ( E a) and preexponential factor ( A), in comparison to the dehydroxylation of montmorillonite (mean E a = 39.1 and 21.8 kcal mol −1, respectively). The compensation effect, correlating E a and log A, was found to hold and a formula was established.
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