地开石热分解过程及非等温动力学研究 |
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作者单位: | 湖北师范学院化学与环境工程系,黄石,435002;湖北师范学院化学与环境工程系,黄石,435002;湖北师范学院化学与环境工程系,黄石,435002 |
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摘 要: |
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关 键 词: | 地开石 热分解 非等温动力学 TG-DTG 红外光谱 |
Thermal Decomposition and Non-isothermal Kinetics of Dickite |
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Authors: | Fang Zhengdong Wang Dunjia Zhang Chuanyue |
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Abstract: | Fourier-transform infrared emission spectroscopy was used to study the dehydroxylation behavior of the thermal decomposition of dickite from Chenxi, Hunan Province, China. Dehydroxylation of dickite was followed by a loss of intensity of the 3620.73, 3695.34 cm-1 OH-stretching bands and 916.06, 1009.33 cm-1 OH bending bands. The thermal decomposition was investigated by thermogravimetric analysis (TGA). A good agreement is found with TG curves of dickite and the mass loss is 13.7% (close to the theoretical value). The non-isothermal kinetics of the thermal decomposition of dickite was studied in TG-DTG curves over the temperature range from 298 K to 1123 K by thermogravimetry and differential thermal analysis in air. Mathematical analysis of TG-DTG data using the integral methods (Coats-Redfern equation, HM equation, MKN equation) and differential method (Achar equation) shows that the thermal decomposition of dickite accords F2 mechanism. The kinetic parameters such as the activation energy (E=131.62 kJ/mol), pre-exponential factor (A=108.30 s-1) and reaction order (n=2.1) are reported. The Ozawa method was used to analyse the activation energy of the same sample at different heating rate and gave 133.07 kJ/mol. The kinetic parameters calculated from different equation are rather close to each other. |
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Keywords: | Dickite Thermal decomposition Non-isothermal kinetics TG-DTG IR |
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