Application of simplified version of advanced isoconversional procedure in non-isothermal kinetic study Thermal decomposition of NH4Co0.9Zn0.1PO4 center dot H2O

作者：Chen, Zhipeng; Chai, Qian; Liao, Sen^*; He, Yu; Li, Yu; Wu, Wenwei; Li, Bin

来源：Journal of Thermal Analysis and Calorimetry, 2013, 113(2): 649-657.

DOI：10.1007/s10973-012-2714-7

• NH4Co0.9Zn0.1PO4 center dot H2O
• Non-isothermal kinetics
• Thermodynamics
• Thermal decomposition
• Thermogravimetric analysis
• Solid-state reaction

The single phase NH4Co0.9Zn0.1PO4 center dot H2O was prepared via solid-state reaction at 80 A degrees C. Based on a simplified version of advanced isoconversional procedure, the values of activation energy E (alpha) associated with the first, second, and third stages of the thermal decomposition of NH4Co0.9Zn0.1PO4 center dot H2O were obtained, which demonstrates that the third stage is a kinetically complex process, and the first and second stages are single-step kinetic processes and can be described by a unique kinetic triplet [E (alpha), A, and g(alpha)]. The most probable reaction mechanisms of the first two stages were estimated by the comparison between experimental plots and modeled results. The values of pre-exponential factor A of the two stages were obtained on the basis of E (alpha) and the reaction mechanisms. The distributed activation energy model was applied to study the third stage. Besides, some thermodynamic functions of transition state complexes (Delta S (not equal), Delta H (not equal), and Delta G (not equal)) of the two stages were also calculated.

• 出版日期2013-8
• 单位广西大学