高岭石热分解反应动力学计算方法对比

doi:10.11896/j.issn.1005-023X.2018.14.010

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Abstract The thermal decomposition process of kaolinite and kaolinite doped with Pr₆O₁₁were 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 5×10¹¹s^-1; activation energy for thermal decomposition reaction of kaolin doped with Pr₆O₁₁is 161.538 kJ·mol^-1, frequency factor is 2.584 9×10¹⁰s^-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.

Key words： Pr₆O₁₁ kaolinite activation energy mechanism function frequency factor

Published: 31 July 2018

CLC number:

TQ170.1

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	Articles by authors
	KUANG Jingzhong
	LIU Pengfei
	LUO Dafang
	ZHOU Yuanbin
	HUANG Zheyu

Cite this article:

KUANG Jingzhong,LIU Pengfei,LUO Dafang, et al. Comparative Study on Kinetic Calculation Methods of Thermal Decomposition of Kaolinite[J]. Materials Reports, 2018, 32(14): 2376-2383.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.14.010 OR http://www.mater-rep.com/EN/Y2018/V32/I14/2376

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