European Journal of Chemistry 2015, 6(2), 199-203 | doi: https://doi.org/10.5155/eurjchem.6.2.199-203.1249 | Get rights and content






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Non-isothermal decomposition kinetics of theobromine in nitrogen atmosphere


Laila Tosson Kamel (1,*)

(1) Narcotic Department, National Center for Social and Criminal Research, Giza, 11561, Egypt
(*) Corresponding Author

Received: 21 Jan 2015 | Accepted: 22 Mar 2015 | Published: 30 Jun 2015 | Issue Date: June 2015

Abstract


The non-isothermal decomposition process of theobromine under nitrogen atmosphere was studied using the differential thermal analysis (DTA), from room temperature up to 500 °C, at heating rates, 5, 15 and 20 °C/min. The results showed that theobromine decomposes in two steps. The kinetic analysis of the first decomposition step was performed using Kissinger, Friedman, Flynn-Wall-Ozawa, and Kissinger-Akahira-Sunose isoconventional methods. The kinetic model was determined using Šatava-Šesták method. Results showed that the non-isothermal decomposition mechanism of theobromine corresponds to nucleation and growth, following the Avrami-Erofeev equation. The forms of the integral and differential equations for the mechanism function are g(α)=(-ln(1-α))2/3 and f(α)=(3/2)(1-α)(-ln(1-α))1/3, respectively. Thermodynamic parameters of the non-isothermal decomposition process, change of enthalpy (ΔH), change of entropy (ΔS), and change of Gibbs free energy (ΔG) values were calculated.


Keywords


Theobromine; Šatava-Šesták method; Thermal decomposition; Thermodynamic parameters; Linear isoconversional methods; Non‐isothermal kinetic parameters

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DOI: 10.5155/eurjchem.6.2.199-203.1249

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How to cite


Kamel, L. Eur. J. Chem. 2015, 6(2), 199-203. doi:10.5155/eurjchem.6.2.199-203.1249
Kamel, L. Non-isothermal decomposition kinetics of theobromine in nitrogen atmosphere. Eur. J. Chem. 2015, 6(2), 199-203. doi:10.5155/eurjchem.6.2.199-203.1249
Kamel, L. (2015). Non-isothermal decomposition kinetics of theobromine in nitrogen atmosphere. European Journal of Chemistry, 6(2), 199-203. doi:10.5155/eurjchem.6.2.199-203.1249
Kamel, Laila. "Non-isothermal decomposition kinetics of theobromine in nitrogen atmosphere." European Journal of Chemistry [Online], 6.2 (2015): 199-203. Web. 9 Aug. 2020
Kamel, Laila. "Non-isothermal decomposition kinetics of theobromine in nitrogen atmosphere" European Journal of Chemistry [Online], Volume 6 Number 2 (30 June 2015)

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DOI Link: https://doi.org/10.5155/eurjchem.6.2.199-203.1249

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