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《材料导报》期刊社  2018, Vol. 32 Issue (14): 2376-2383    https://doi.org/10.11896/j.issn.1005-023X.2018.14.010
  无机非金属及其复合材料 |
高岭石热分解反应动力学计算方法对比
匡敬忠, 刘鹏飞, 罗大芳, 周原彬, 黄哲誉
江西理工大学资源与环境工程学院,赣州 341000
Comparative Study on Kinetic Calculation Methods of Thermal Decomposition of Kaolinite
KUANG Jingzhong, LIU Pengfei, LUO Dafang, ZHOU Yuanbin, HUANG Zheyu
Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000
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摘要 采用综合热分析仪研究了高岭石及掺入Pr6O11高岭石的热分解过程。依据热重曲线和微商热重数据,运用线性法和非线性法分别计算出热分解反应的活化能,比较了不同方法的精确性,使用Malek法确定了反应机理函数,进一步求出频率因子。结果表明:非线性法比线性法的计算结果更精确,三种非线性法的计算精度一致;各线性法精确度的高低顺序为胡荣祖法>唐万军法>Starink法>MKN法>KAS法>Ozawa法;基于非线性法计算得出高岭石热分解反应活化能为173.735 kJ·mol-1,频率因子为1.942 5×1011 s-1,掺入Pr6O11的高岭石热分解反应的活化能为161.538 kJ·mol-1,频率因子为2.584 9×1010 s-1,两者均符合化学反应模型;对比热分解反应速率系数发现,Pr6O11的掺入提高了高岭石热分解后期(结构内部羟基脱除阶段)的反应速率,有助于高岭石热分解反应的进行。
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匡敬忠
刘鹏飞
罗大芳
周原彬
黄哲誉
关键词:  Pr6O11  高岭石  活化能  机理函数  频率因子    
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.
Key words:  Pr6O11    kaolinite    activation energy    mechanism function    frequency factor
               出版日期:  2018-07-25      发布日期:  2018-07-31
ZTFLH:  TQ170.1  
基金资助: 国家自然科学基金(51264009)
作者简介:  匡敬忠:1971年生,博士,教授,主要研究方向为矿物材料、矿物分选理论与工艺和二次资源综合利用 E-mail:kjz692@163.com
引用本文:    
匡敬忠, 刘鹏飞, 罗大芳, 周原彬, 黄哲誉. 高岭石热分解反应动力学计算方法对比[J]. 《材料导报》期刊社, 2018, 32(14): 2376-2383.
KUANG Jingzhong, LIU Pengfei, LUO Dafang, ZHOU Yuanbin, HUANG Zheyu. Comparative Study on Kinetic Calculation Methods of Thermal Decomposition of Kaolinite. Materials Reports, 2018, 32(14): 2376-2383.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.14.010  或          http://www.mater-rep.com/CN/Y2018/V32/I14/2376
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