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Thermogravimetry and differential thermal analysis were used in the study of the kinetics of non-isothermal sodium acetate's thermal decomposition under an air atmosphere. The diagrams were recorded on a sample mass of 20 mg at temperatures ranging from 20 to 600°C. Five different heating rates were used. The relations of α vs. T were estimated from the mass losses. The values of the kinetic parameters (activation energy and the pre-exponential factor) of the thermal decomposition were calculated from α(T) data in several ways: by using the integral method, applying the Coats-Redfern approximation, the modified isoconversional Coats-Redfern method, the differential method of Friedman and the Kissinger's method. A correlation was found between kinetic parameters estimated by different kinetic methods.
Czasopismo
Rocznik
Tom
Strony
22--25
Opis fizyczny
Bibliogr. 22 poz., rys., tab.
Twórcy
autor
autor
- Szczecin University of Technology, Institute of Chemistry and Environmental Protection, al. Piastów 42, 71-065 Szczecin, magol@ps.pl
Bibliografia
- (1) Mohamed M. A., Halawy S. A., Ebrahim I M. M.: The non-isothermal decomposition of cobalt acetate tetrahydrate. J. Therm. Anal., 1994, 41, 387.
- (2) Obaid A. Y., Alyoubi A. O., Samarkandy A. A., Al-Thabaiti S. A., Al-Juaid S. S., El-Bellihi A. A., Deifallah El- H. M: Kinetics of thermal decomposition of copper (II) acetate monohydrate, J.Therm. Anal.Cal., 2000, 61, 985.
- (3) Grotowska M., Wojciechowska R., Wojciechowski W.: The thermal decomposition of some Cr (III) complexes, J. Therm. Anal., 1990, 36, 2365.
- (4) Ball M. C, Portwood L.: The dehydration of copper (II) acetate monohydrate, J. Therm.Anal., 1994, 41, 347.
- (5) Afzal M., Butt P. K., Ahmad H.: Kinetics of thermal decomposition of metal acetates, J. Therm. Anal., 1991, 37, 1015.
- (6) Ingier-Stocka E., Grabowska A.: Thermal analysis of cobalt (II) salts with some carboxilic acids, J. Therm. Anal. Cal., 1998, 54, 115.
- (7) Judd M. D., Plunkett B. A., Pope M. I.: The thermal decomposition of calcium, sodium, silver and copper (II) acetates. J. Thermal Anal., 1974, 6, 555.
- (8) McAdie H. G., Jervis J. M.: Thermochimica Acta, 1970, 1, 19.
- (9) Atlas of Thermoanalytical Curves Edited by Liptay G.: Vol.1. Akadémiai Kiadó, Budapest, 1971.
- (10) Comprehensive Chemical Kinetics, Vol.22 Elsevier, Amsterdam, Oxford, New York, 1980.
- (11) Galwey A. K.: Decomposition reaction solid, International Review of Science: Inorganic Chemistry, Series 2, Vol. 10 Solid.(Ed. Roberts L. E. J. ) (Butterworth: London), Chap.5. 1975, 147.
- (12) Galwey A. K.: Thermal reactions of selected solids including reactants that melt during chemical change, J. Thermal Anal., 1970, 41, 267.
- (13) Coats A. W., Redfern J. P.: Kinetic parameters from thermogravimetric data, Nature, 1964, 201, 68.
- (14) Burnham A. K., Braun R. L.: Global kinetic analysis of complex materials, Energy Fuels, 1999, 13, 1.
- (15) Brown M. E., Maciejewski M, Vyazovkin S.: et al., Computational aspects of kinetic analysis, Part A, Therm. Acta, 2000, 355. 125.
- (16) Vyazovkin S., Wight C. A.: Model-free and model-fitting approaches to kinetic analysis of isothermal and nonisothermal data, Therm. Acta, 1999, 340 - 341, 53.
- (17) Friedman H.: J. Polym. Sci., Part C, 1963, 183.
- (18) Mohamed M. A., Halawy S. A., Ebrahim M. M.: The non-isothermal decomposition of cobalt acetate tetrahydrate. J. Thermal Anal., 1994, 41, 387
- (19) Kissinger H. E.: Reaction Kinetics in Differential Thermal Analysis, Anal. Chem., 1957, 29 1702.
- (20) Straszko J., Olszak-Humienik M., Możejko J.: Kinetics of thermal decomposition of ZnSO4·7H2O. Therm. Acta. 1997, 292, 145.
- (21) Vyazovkin S.: Modification of the integral method to account for variation in the activation energy, J. Comput. Chem., 2001, 22, 178.
- (22) Vyazovkin S.: Evaluation of activation energy of thermally stimulated solid-state reactions under arbitrary variation of temperature, J. Comput. Chem., 1997, 22. 393.
- (23) Vyazovkin S.: A unified approach to kinetic processing of nonisothermal data, Int. J. Chem. Kinet., 1996. 28. 95.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPS2-0039-0007