TY  - JOUR
AU  - Janković, Bojan Ž.
AU  - Mentus, Slavko V.
AU  - Janković, Marija M.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3517
AB  - The thermal decomposition kinetics of potassium metabisulfite was studied by thermogravimetric (TG) and differential thermogravimetric (DTG) techniques using non-isothermal experiments. The apparent activation energy (E-a) is determined using the differential (Friedman) isoconversional method. The results of the Friedmans isoconversional analysis of the TG data suggests that the investigated decomposition process follows a single-step reaction and the observed apparent activation energy was determined as 122.4 +/- 2.1 kJ mol(-1). A kinetic rate equation was derived for the decomposition process of potassium metabisulfite with contracting area model, f(alpha) = 2(1-alpha)(1/2), which is established using the Maleks kinetic procedure. The value of pre-exponential factor (A) is also evaluated and was found to be A = 1.37 x 10(12) min(-1). By applying the Miuras procedure the distributed reactivity model (DRM) for investigated decomposition process was established. From the dependence alpha versus E-a, the experimental distribution curve of apparent activation energies, f(E-a), was estimated. By applying the non-linear least-squares analysis, it was found that the Gaussian distribution model (with distribution parameters E-0 = 121.3 kJ mol(-1) and sigma = 1.5 kJ mol(-1)) represents the best reactivity model for describing the investigated process. Using the Miuras method, the A values were estimated at five different heating rates and the average A values are plotted against E-a. The linear relationship between the A and E-a values was established (compensation effect). Also, it was concluded that the E-a values calculated by the Friedmans method and estimated distribution curve, f(E-a), are correct even in the case when the investigated decomposition process occurs through the single-step reaction mechanism. (C) 2008 Elsevier Ltd. All rights reserved.
T2  - Journal of Physics and Chemistry of Solids
T1  - A kinetic study of the thermal decomposition process of potassium metabisulfite: Estimation of distributed reactivity model
VL  - 69
IS  - 8
SP  - 1923
EP  - 1933
DO  - 10.1016/j.jpcs.2008.01.013
ER  - 

@article{
author = "Janković, Bojan Ž. and Mentus, Slavko V. and Janković, Marija M.",
year = "2008",
abstract = "The thermal decomposition kinetics of potassium metabisulfite was studied by thermogravimetric (TG) and differential thermogravimetric (DTG) techniques using non-isothermal experiments. The apparent activation energy (E-a) is determined using the differential (Friedman) isoconversional method. The results of the Friedmans isoconversional analysis of the TG data suggests that the investigated decomposition process follows a single-step reaction and the observed apparent activation energy was determined as 122.4 +/- 2.1 kJ mol(-1). A kinetic rate equation was derived for the decomposition process of potassium metabisulfite with contracting area model, f(alpha) = 2(1-alpha)(1/2), which is established using the Maleks kinetic procedure. The value of pre-exponential factor (A) is also evaluated and was found to be A = 1.37 x 10(12) min(-1). By applying the Miuras procedure the distributed reactivity model (DRM) for investigated decomposition process was established. From the dependence alpha versus E-a, the experimental distribution curve of apparent activation energies, f(E-a), was estimated. By applying the non-linear least-squares analysis, it was found that the Gaussian distribution model (with distribution parameters E-0 = 121.3 kJ mol(-1) and sigma = 1.5 kJ mol(-1)) represents the best reactivity model for describing the investigated process. Using the Miuras method, the A values were estimated at five different heating rates and the average A values are plotted against E-a. The linear relationship between the A and E-a values was established (compensation effect). Also, it was concluded that the E-a values calculated by the Friedmans method and estimated distribution curve, f(E-a), are correct even in the case when the investigated decomposition process occurs through the single-step reaction mechanism. (C) 2008 Elsevier Ltd. All rights reserved.",
journal = "Journal of Physics and Chemistry of Solids",
title = "A kinetic study of the thermal decomposition process of potassium metabisulfite: Estimation of distributed reactivity model",
volume = "69",
number = "8",
pages = "1923-1933",
doi = "10.1016/j.jpcs.2008.01.013"
}

Janković, B. Ž., Mentus, S. V.,& Janković, M. M.. (2008). A kinetic study of the thermal decomposition process of potassium metabisulfite: Estimation of distributed reactivity model. in Journal of Physics and Chemistry of Solids, 69(8), 1923-1933.
https://doi.org/10.1016/j.jpcs.2008.01.013

Janković BŽ, Mentus SV, Janković MM. A kinetic study of the thermal decomposition process of potassium metabisulfite: Estimation of distributed reactivity model. in Journal of Physics and Chemistry of Solids. 2008;69(8):1923-1933.
doi:10.1016/j.jpcs.2008.01.013 .

Janković, Bojan Ž., Mentus, Slavko V., Janković, Marija M., "A kinetic study of the thermal decomposition process of potassium metabisulfite: Estimation of distributed reactivity model" in Journal of Physics and Chemistry of Solids, 69, no. 8 (2008):1923-1933,
https://doi.org/10.1016/j.jpcs.2008.01.013 . .