Kinetic behaviour of thermal transformations of kaolinite

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Kinetic behaviour of thermal transformations of kaolinite

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Kinetic behaviour of thermal transformations of kaolinite

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/GBP105%2F12%2FG059" target="_blank" >GBP105/12/G059: Kumulativní časově závislé procesy ve stavebních materiálech a konstrukcích</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

THERMOPHYSICS 2018: 23rd International Meeting of Thermophysics 2018

ISBN

9780735417045

ISSN

0094-243X

e-ISSN

—

Počet stran výsledku

6

Strana od-do

—

Název nakladatele

AIP Publishing, APL, the American Institute of Physics

Místo vydání

Melville, NY

Místo konání akce

Smolenice

Datum konání akce

7. 11. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000450557800033