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2007 | 5 | 1 | 341-348
Tytuł artykułu

Studies of dehydration kinetics of Li2SO4·H2O by the master plots method

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The kinetics of Li2SO4·H2O dehydration in static air atmosphere was studied on the basis of nonisothermal measurements by differential scanning calorimetry. Dehydration data were subjected to an integral composite procedure, which includes an isoconversional method, a master plots method and a model-fitting method. Avrami-Erofeev equation was found to describe all the experimental data in the range of conversion degrees from 0.1 to 0.9. The determined activation energy equals 65.45 kJ·mol−1 with standard deviation ±0.47 kJ·mol−1. The estimated value of parameter m in Avrami-Erofeev equation is 2.15 with standard deviation ±0.11. Also, the obtained pre-exponential factor is 7.79×105 s−1 with standard deviation ±0.55×105 s−1. The results show that the present integral composite procedure gives self-consistent kinetic parameters.
Wydawca
Czasopismo
Rocznik
Tom
5
Numer
1
Strony
341-348
Opis fizyczny
Daty
wydano
2007-03-01
online
2007-03-01
Twórcy
autor
  • Hubei Key Laboratory for Catalysis & Material Science, College of Chemistry & Material Science, South-Central University for Nationalities, Wuhan, 430074, China , tangmailbox@126.com
autor
  • Hubei Key Laboratory for Catalysis & Material Science, College of Chemistry & Material Science, South-Central University for Nationalities, Wuhan, 430074, China , chendh46@sina.com
Bibliografia
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  • [8] W. Kezhong, Z. Jianjun, G. Yanrui and L. Xiaodi: “Determination of nonisothermal kinetic parameters of lithium sulfate monohydrate”, Chin. J. Rare Metals, Vol. 25, (2001), pp. 389–391.
  • [9] Y. Seto, H. Sato and Y. Masuda: “Effect of water vapor pressure on thermal dehydration of lithium sulfate monohydrate”, Thermochim. Acta, Vol. 388, (2002), pp. 21–25. http://dx.doi.org/10.1016/S0040-6031(02)00049-7[Crossref]
  • [10] Z. Jianjun, B. Jihai, Z. Xiufang, Z. Xue and W. Kezhong: “Non-isothermal kinetics of the dehydration process for lithium sulfate monohydrate in solid state”, Chin. J. Anal. Chem., Vol. 31, (2003), pp. 726–730.
  • [11] G.J.T. Fernandes, A.S. Araújo, J.V.J. Fernandes and C. Novák: “Model-free kinetics applied to regeneration of coked alumina”, J. Therm. Anal. Cal., Vol. 75, (2004), pp. 687–692. http://dx.doi.org/10.1023/B:JTAN.0000027163.44593.4a[Crossref]
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  • [15] V. Mamleev, S. Bourbigot, M.L. Bras, S. Duquesne and J. Sestak: “Modeling of nonisothermal kinetics in thermogravimetry”, Phys. Chem. Chem. Phys., Vol. 2, (2000), pp. 4708–4716. http://dx.doi.org/10.1039/b004355i[Crossref]
  • [16] T. Wanjun, L. Yuwen, Z. Hen and W. Cunxin: “New approximate formula for Arrhenius temperature integral”, Thermochim. Acta, Vol. 408, (2003), pp. 39–43. http://dx.doi.org/10.1016/S0040-6031(03)00310-1[Crossref]
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Typ dokumentu
Bibliografia
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Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-006-0049-6
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