Czasopismo
Tytuł artykułu
Autorzy
Warianty tytułu
Języki publikacji
Abstrakty
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.
Czasopismo
Rocznik
Tom
Numer
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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- [3] R. Sabbah, An Xu-wu, J.S. Chickos, M.L. Planas Leitao, M.V. Roux and L.A. Torres: “Reference materials for calorimetry and differential thermal analysis”, Thermochim. Acta, Vol. 331, (1999), pp. 93–204. http://dx.doi.org/10.1016/S0040-6031(99)00009-X[Crossref]
- [4] N.A. Simakova, N.Z. Lyakhov and N.A. Rudina: “Thermal dehydration of lithium sulfate monohydrate. The reaction reversibility and the solid product morphology”, Thermochim. Acta, Vol. 256, (1995), pp. 381–389. http://dx.doi.org/10.1016/0040-6031(94)02100-3[Crossref]
- [5] A.N. Modestov, P.V. Poplaukhin and N.Z. Lyakhov: “Dehydration kinetics of lithium sulfate monohydrate single crystals”, J. Therm. Anal. Cal., Vol. 65, (2001), pp. 121–130. http://dx.doi.org/10.1023/A:1011576502046[Crossref]
- [6] B.V. Lvov and V.L. Ugolkov: “The self-cooling effect in the process of dehydration of Li2SO4·H2O, CaSO4·2H2O and CuSO4·5H2O in vacuum”, J. Therm. Anal. Cal., Vol. 74, (2003), pp. 697–708. http://dx.doi.org/10.1023/B:JTAN.0000011002.06238.97[Crossref]
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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]
- [12] P. Šimon: “Isoconversional methods. Fundamentals, meaning and application”, J. Therm. Anal. Cal., Vol. 76, (2004), pp, 123–132. http://dx.doi.org/10.1023/B:JTAN.0000027811.80036.6c[Crossref]
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- [14] L.A. Perez-Maqueda, J.M. Criado, F.J. Gotorand and J. Malek: “Advantages of combined kinetic analysis of experimental data obtained under any heating profile”, J. Phys. Chem. A, Vol. 106, (2002), pp. 2862–2868. http://dx.doi.org/10.1021/jp012246b[Crossref]
- [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]
- [17] H. Tanaka: “Thermal analysis and kinetics of solid state reactions”, Thermochim. Acta, Vol. 267, (1995), pp. 29–44. http://dx.doi.org/10.1016/0040-6031(95)02464-6[Crossref]
- [18] T. Wanjun, L. Yuwen, Z. Hen, W. Zhiyong and W. Cunxin: “New temperature integral approximate formula for nonisothermal kinetic analysis”, J. Therm. Anal. Cal., Vol. 74, (2003), pp. 309–315. http://dx.doi.org/10.1023/A:1026310710529[Crossref]
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-006-0049-6