Effect of chloride dopant on the kinetics of the thermal decomposition of sodium oxalate

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• 作者：K. Muraleedharan ; M. Jose John¹ ; M.P. Kannan ; V.M. Abdul Mujeeb ; ^{vmamujeeb@gmail.com}
• 关键词：Contracting cylinder equation ; Diffusion controlled mechanism ; Isothermal thermogravimetry ; Prout&ndash ; Tompkins equation ; Sodium oxalate ; Chloride doping
• 刊名：Thermochimica Acta
• 出版年：2012
• 期刊代码：110_00406031
• 类别：ch
• 出版时间：10 June, 2012
• 卷：537
• 期：Complete
• 页码：25-30
• 文件大小：318 K

摘要

The thermal decomposition kinetics of sodium oxalate (Na₂C₂O₄) has been studied as a function of concentration of dopant, chloride, at five different temperatures in the range 783-803 K under isothermal conditions by thermogravimetry (TG). The TG data were subjected to both model free and model fitting methods of kinetic analysis. The results obtained from model fitting methods of kinetic analysis shows that no single kinetic model describes the whole 伪 versus t curve with a single rate constant throughout the decomposition reaction. Separate kinetic analysis shows that Prout-Tompkins model best describes the acceleratory stage of the decomposition while the decay region is best fitted with the contracting cylinder model, and corresponding activation energy values were evaluated. The diffusion of Na⁺ ions occupying normal lattice sites and interstitial sites was greatly affected by a change in the concentration of defects.