Lifetime prediction and kinetic parameters of thermal decomposition of cashew gum by thermal analysis
| Autor: | Cheila G. Mothé, Jaqueline Souza de Freitas |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Thermogravimetric analysis
Materials science Thermal decomposition chemistry.chemical_element Thermodynamics 02 engineering and technology Activation energy 021001 nanoscience & nanotechnology Condensed Matter Physics Kinetic energy 01 natural sciences Nitrogen 010406 physical chemistry 0104 chemical sciences Thermokinetics chemistry Physical and Theoretical Chemistry 0210 nano-technology Thermal analysis Nonlinear regression |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 131:397-404 |
| ISSN: | 1588-2926 1388-6150 |
| Popis: | The thermal decomposition kinetics of cashew gum, an exudate polysaccharide from A. occidentale L., has been investigated by thermogravimetric analysis in nitrogen and air atmospheres and non-isothermal conditions. The heating rates were of 5, 10, and 20 K min−1 and gas flow of 20 mL min−1. The NETZSCH Thermokinetics 3 software estimated the activation energy and pre-exponential factor with Friedman and Ozawa–Flynn–Wall methods. Multivariate nonlinear regression analysis was applied to estimate a probable mechanism and lifetime prediction and to describe the thermal decomposition. The results obtained showed that the energy activation is dependent on the conversion degree for both atmospheres. For nitrogen, the most appropriate kinetic model was estimated with two consecutive stage reactions (FnF1 model). For air, the best model was estimated with six stages consecutive and completive reactions (FnFnFnFnFnFn model). |
| Databáze: | OpenAIRE |
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