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《Journal of University of Chinese Academy of Sciences》 2015-01
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Experimental study on thermal decomposition kinetics of talc under the condition of air atmosphere

WANG Yan;WANG Duojun;YI Li;Key Laboratory of Computational Geodynamics,University of Chinese Academy of Sciences;Institute of Earthquake Science,China Earthquake Administration;  
Study on thermal decomposition kinetics of hydrous minerals is important to the exploration of the formation mechanisms of intermediate-deep earthquakes occurred in subduction zone. In the present work thermal decomposition of talc was studied by using thermogravimetric( TG) techniques under the condition of dynamical air atmosphere. The model-free methods including Friedman and FWO were employed to determine the activation energy( Ea) and the preexponential factor( A). Based on the initial values derived from Friedman method,the most probable kinetic model of the dehydration reaction was obtained by using the multivariate non-linear regression approach. The results showed that talc decomposed in the temperature range of 830 ~1 050℃ and the most probable kinetic model could be expressed as f( α) =( 1- α)nand G( α) =( 1-( 1- α)( 1-n)) /( 1- n),with the derived values of 1. 7,344. 2 k J/mol,and 4. 9E12 s- 1for n,Ea,and A,respectively.
【Fund】: 中国科学院、国家外专局创新团队国际合作伙伴计划(KZZD-EW-TZ-19);; 国家自然科学基金(41074063 41374095 41373060)资助
【CateGory Index】: O643.1
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