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Thermal Decomposition and Non-isothermal Kinetics of Dickite
Fang Zhengdong*,Wang Dunjia,Zhang Chuanyue
Author NameAffiliationE-mail
Fang Zhengdong* Department of Chemistry and Environmental Engineering, Hubei Normal University, Huangshi 435002 zdfangluo@sina.com 
Wang Dunjia Department of Chemistry and Environmental Engineering, Hubei Normal University, Huangshi 435002  
Zhang Chuanyue Department of Chemistry and Environmental Engineering, Hubei Normal University, Huangshi 435002  
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.
Key words:  Dickite, Thermal decomposition, Non-isothermal kinetics, TG-DTG, IR
FundProject:
地开石热分解过程及非等温动力学研究
方正东*,汪敦佳,张传越
摘要:
用傅利叶变换红外光谱仪研究了湖南晨溪地开石热分解前后的红外光谱,加热反应后原矿粉红外光谱在3620.73、3695.34 cm-1处的地开石羟基伸缩振动吸收峰和在916.06、1009.33 cm-1处的羟基弯曲振动吸收峰都消失,表明其质量失重为羟基脱水.在298~1123 K,用TG-DTA综合分析仪研究了地开石在程序升温下的热分解行为.结果表明,在600~1000 K,其质量损失为13.7%,与理论计算的脱水量相近.根据TG-DTG曲线上的基础数据,联合运用积分法(Coats-Redfern方程、HM
关键词:  地开石  热分解  非等温动力学  TG-DTG  红外光谱
DOI:10.1088/1674-0068/18/4/619-624
分类号: