Abstract: The thermal decomposition process of kaolinite and kaolinite doped with Pr6O11 were investigated by simultaneous thermal analyzer. According thermogravimetric curve and differential thermogravimetric, liner method and no-liner method were used to calculate activation energy of thermal decomposition reaction, accuracy of each method was compared, Malek method was used to determined reaction mechanism function, frequency factor was obtained finally. The results show that the calculation results of no-liner method are more accurate than liner method, the accuracy of results calculated by no-liner method are consistent,the order of accuracy of each linear method is Hu>Tang> Starink> MKN>KAS>Ozawa;activation energy for thermal decomposition reaction of kaolin is 173.735 kJ·mol-1 based on no-liner method, frequency factor is 1.942 5×1011 s-1; activation energy for thermal decomposition reaction of kaolin doped with Pr6O11 is 161.538 kJ·mol-1, frequency factor is 2.584 9×1010 s-1, both conform to the chemical reaction mode; the incorporation of Pr6O11 increases the later period (removal of the internal hydroxyl) conversion rate and contribute to thermal decomposition reaction of kaolinite through contrasting reaction rate coefficient.
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