The Kinetic Analysis of Carbide Lime Reaction Based on Multi-Heating Rate Method

Abstract:

In this paper, research was focused on the carbide lime decomposition mechanism in pure N2 atmosphere by using thermo-gravimetric analysis with multi-heating rate method. Appling equal conversion rate method, activity energy E was calculated which was equal to 84.79 kJ/mol without proposing decomposition mechanism. A more accurate and reliable method based on multi-heating rate methods was put forward to deduce the mechanism function of above reaction, which was called “master plot methods”. Comparison was done between the theoretical master plots drawn by assuming various kinetic models and the experimental master plot, which allows us to select the probably appropriate kinetic model of the process under investigation. And the further detailed kinetic analysis was achieved as the knowledge of the kinetic model. The results are as follows: the reaction mechanism function f(α)=2.95(1-α)0.661 or G(α)=1-(1-α)0.339, the pre-exponential factor lnA=15.95. And the decomposition mechanism of carbide lime turned out to be the phase boundary shrinking sphere reaction.

• Periodical: Applied Mechanics and Materials (Volumes 148-149)
• Pages: 313-317
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.148-149.313
• Online since: December 2011
• Authors: Duo Jiao Guan, You Ning Xu, Jiu Ju Cai, Wen Qiang Sun, Hai Zhao
• Keywords: Carbide Lime, Multi-Heating Rate, Thermal Decomposition, Thermo-Gravimetric

References

[1] Gotor F J，Criado J M，Malek J and Koga N, "Kinetic analysis of solid-state reactions: the university of master plots for analyzing isothermal and nonisothermal experiments," Journal of Physical Chemistry， 2000， 104(46): 10777-10782．

DOI: 10.1021/jp0022205

[2] Perez-Maqueda L A，Criado J M and Goto F J, "Advantages of combined kinetic analysis of experimental data obtained under any heating profile," Journal of Physical Chemistry，2002，106(12): 2862-2868.

DOI: 10.1021/jp012246b

[3] Ozawa, T. J. Therm. Anal. Calorim. 2001,64,109.

[4] Raymond C. Eversona, Hein W.J.P. Neomagusa, Delani Njapha, "Kinetic analysisof non-isothermal thermogravimetric analyzer results using a new method for the evaluation of the temperature integral and multi-heating rates," Fuel, 85(2006), 418-422.

DOI: 10.1016/j.fuel.2005.07.003

[5] Orfao JJM, Martins FG. Thermochimica 2002;390:195.

[6] Fan Zhaoyan, Lu Chunmei, Zhao Gaiju and Zhao Jianli, "Experiment Study on Calcination and Dynamics Reaction of Industrial Wastes," Power System Engineering, 2007, 23(06):8-11.

[7] Qi Qingjie，Ma Yundong, Liu Jianzhong, Cao Xinyu and Chen Kefa, "Thermogravimetric experiment research on thermal decomposition mechanics of calcium arbonate," Journal of Liaoning Technical University，2002，21(6)：689-692．

[8] Zheng Ying，Chen Xiaohua，Zhou Yingbiao and Zheng Chuguang, "The decomposition mechanism of CaCO3 and its kinetics parameters," Journal of HuaZhong University of Science & Technology： Nature Science Edition，2002，30(12)： 86-88．

[9] ˙Irfan Ar, Gül¸sen Do˘gu, "Calcination kinetics of high purity limestones," Chemical Engineering Journal 83 (2001) 131–137.

DOI: 10.1016/s1385-8947(00)00258-8