NDLI: Kinetics and mechanism of dehydration of kaolinite, muscovite and talc analyzed thermogravimetrically by the third-law method

Content Provider	Springer Nature Link
Author	L'vov, B. V. Ugolkov, V. L.
Copyright Year	2005
Abstract	The third-law method has been applied to determine the enthalpies, Δ$_{r}$H$_{T}$$^{0}$, for dehydration reactions of kaolinite, muscovite and talc. The Δ$_{r}$H$_{T}$$^{0}$values measured in the equimolar (in high vacuum) and isobaric (in the presence of water vapour) modes (980±15, 3710±39 and 2793±34 kJ mol$^{-1}$, for kaolinite, muscovite and talc, respectively) practically coincide if to take into account the strong self-cooling effect in vacuum. This fact strongly supports the mechanism of dissociative evaporation of these compounds in accordance with the reactions (primary stages): Al$_{2}$O$_{3}$·2SiO$_{2}$·2H$_{2}$O(s)→Al$_{2}$O$_{3}$(g)↓+2SiO$_{2}$(g)↓+2H$_{2}$O(g); K$_{2}$O·3Al$_{2}$O$_{3}$·6SiO$_{2}$·2H$_{2}$O(s) →K$_{2}$O(g)↓+3Al$_{2}$O$_{3}$(g)↓+6SiO$_{2}$(g)↓+2H$_{2}$O(g) and 3MgO·4SiO$_{2}$·H$_{2}$O(s) →3MgO(g)↓+4SiO$_{2}$(g)↓+H$_{2}$O(g). The values of the Eparameter deduced from these data for equimolar and isobaric modes of dehydration are as follows: 196 and 327 kJ mol$^{-1}$for kaolinite, 309 and 371 kJ mol$^{-1}$for muscovite and 349 and 399 kJ mol$^{-1}$for talc. These values are in agreement with quite a few early results reported in the literature in 1960s.
Starting Page	15
Ending Page	22
Page Count	8
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	82
Issue Number	1
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Physical Chemistry Polymer Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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