Kinetic behaviour of thermal transformations of kaolinite

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F18%3A00324455" target="_blank" >RIV/68407700:21110/18:00324455 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1063/1.5047627" target="_blank" >http://dx.doi.org/10.1063/1.5047627</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/1.5047627" target="_blank" >10.1063/1.5047627</a>

Result language
angličtina
Original language name
Kinetic behaviour of thermal transformations of kaolinite
Original language description
The kinetic behaviour of kaolinite dehydroxylation and the formation of Al-Si spinel phase is studied using differential scanning calorimetry on powder samples with heating rates from 1 to 10 °C min–1 in a dynamic argon atmosphere. The values of the apparent activation energy and pre-exponential factor were calculated using the Kissinger method. The results show that the dehydroxylation of kaolinite is controlled by several possible mechanisms, including a 1D interface controlled reaction, a 2D diffusion controlled reaction and a diffusion controlled process with zero nucleation rate. The determined values of apparent activation energy and pre-exponential factor of this process are (162 ± 1) kJ mol–1 and (1.99 ± 0.01)x108 s–1, respectively. The results also show that the crystallization of cubic Al-Si spinel phase from metakaolinite is controlled by two possible mechanisms, including grain edge nucleation after saturation and the zero nucleation rate (site saturation). For this process, the determined values of apparent activation energy and pre-exponential factor are (956 ± 1) kJ mol–1 and (4.81 ± 0.11)x1037 s–1, respectively.
Czech name
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Czech description
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Project
<a href="/en/project/GBP105%2F12%2FG059" target="_blank" >GBP105/12/G059: Cumulative time dependent processes in building materials and structures</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
THERMOPHYSICS 2018: 23rd International Meeting of Thermophysics 2018
ISBN
9780735417045
ISSN
0094-243X
e-ISSN
—
Number of pages
6
Pages from-to
—
Publisher name
AIP Publishing, APL, the American Institute of Physics
Place of publication
Melville, NY
Event location
Smolenice
Event date
Nov 7, 2018
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000450557800033

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