Kinetic analysis of illite dehydroxylation from differential scanning calorimetry
Result description
The two-step dehydroxylation of illite is studied using the differential scanning calorimetry on powder samples with heating rates from 1 to 10 °C min-1 in a dynamic argon atmosphere. The values of apparent activation energy and pre-exponential factor are calculated using the Kissinger method. The determined values of apparent activation energy and pre-exponential factor for the trans-vacant layer dehydroxylation are (227 ± 6) kJ mol-1 and (2.87 ± 0.09)x1013 min-1, respectively. The results also show that this process can be characterized by a 1D diffusion-controlled reaction with instantaneous nucleation rate. For the cis-vacant layer dehydroxylation, the values of apparent activation energy and pre-exponential factor are (242 ± 10) kJ mol-1 and (5.37 ± 0.23)x1012 min-1, respectively. The value of the Avrami peak factor for this step indicates diffusion-controlled growth of the new phase with zero or decreasing nucleation rate.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Kinetic analysis of illite dehydroxylation from differential scanning calorimetry
Original language description
The two-step dehydroxylation of illite is studied using the differential scanning calorimetry on powder samples with heating rates from 1 to 10 °C min-1 in a dynamic argon atmosphere. The values of apparent activation energy and pre-exponential factor are calculated using the Kissinger method. The determined values of apparent activation energy and pre-exponential factor for the trans-vacant layer dehydroxylation are (227 ± 6) kJ mol-1 and (2.87 ± 0.09)x1013 min-1, respectively. The results also show that this process can be characterized by a 1D diffusion-controlled reaction with instantaneous nucleation rate. For the cis-vacant layer dehydroxylation, the values of apparent activation energy and pre-exponential factor are (242 ± 10) kJ mol-1 and (5.37 ± 0.23)x1012 min-1, respectively. The value of the Avrami peak factor for this step indicates diffusion-controlled growth of the new phase with zero or decreasing nucleation rate.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20504 - Ceramics
Result continuities
Project
GBP105/12/G059: Cumulative time dependent processes in building materials and structures
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
AIP Conference Proceedings, International Conference on Numerical Analysis and Applied Mathematics 2018, ICNAAM 2018
ISBN
978-0-7354-1854-7
ISSN
0094-243X
e-ISSN
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Number of pages
4
Pages from-to
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Publisher name
American Institute of Physics Inc.
Place of publication
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Event location
Rhodes
Event date
Sep 13, 2018
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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Basic information
Result type
D - Article in proceedings
OECD FORD
Ceramics
Year of implementation
2019