Geopolymers
Inorganic polymeric new materials
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Author:
Korkut Açıkalın
Korkut Açıkalın
Chemical Engineering Department, Yıldız Technical University, Davutpaşa Cad. No:127, Esenler, 34210, Istanbul, Turkey
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Abstract
Thermal degradation behavior and kinetics of a biomass waste material, namely walnut shell, were investigated by using a thermogravimetric analyzer. The desired final temperature of 800 °C was achieved at three different heating rates (2, 10, and 15 °C min−1) under nitrogen flow (50 mL min−1). The TG and DTG curves exhibited three distinct zones that can mainly be attributed to removal of water, decomposition of hemicellulose + cellulose, and decomposition of lignin, respectively. The kinetic parameters (activation energy, pre-exponential factor, and reaction order) of active pyrolysis zone were determined by applying Arrhenius, Coats–Redfern, and Horowitz–Metzger methods to TG results. The values of activation energies were found to be between 45.6 and 78.4 kJ mol−1. There was a great agreement between the results of Arrhenius and Coats–Redfern methods while Horowitz–Metzger method yielded relatively higher results. The existence of kinetic compensation effect was evident.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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