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Kinetics of thermal decomposition of howlite mineral at different heating rates.
- Source :
-
Sigma: Journal of Engineering & Natural Sciences / Mühendislik ve Fen Bilimleri Dergisi . Feb2023, Vol. 41 Issue 1, p74-83. 10p. - Publication Year :
- 2023
-
Abstract
- In this work, the thermal decomposition kinetics of howlite were investigated at different heating rates by using Coats-Redfern, Ozawa, and Kissinger-Akahira-Sunose kinetic models under non-isothermal conditions. The thermal decomposition of howlite occurred in two dehydroxylation stages. Results indicated that it decomposes in the first dehydroxylation stage at a very slow rate due to the higher thermal stability of the mineral. Kinetic parameters were determined using the above-mentioned models for all decomposition stages. The activation energies calculated from the Ozawa and Kissinger-Akahira-Sunose isoconversional methods fit well with each other, while the activation energies calculated with the Coats-Redfern method were different. It was also seen that the activation energy of the decomposition reaction changed with the degree of conversion, suggesting that the reaction mechanism is not single-step. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CHEMICAL decomposition
*MINERALS
*THERMAL stability
Subjects
Details
- Language :
- English
- ISSN :
- 13047191
- Volume :
- 41
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Sigma: Journal of Engineering & Natural Sciences / Mühendislik ve Fen Bilimleri Dergisi
- Publication Type :
- Academic Journal
- Accession number :
- 164794965
- Full Text :
- https://doi.org/10.14744/sigma.2022.00020