文献类型：期刊文献

英文题名：Mechanism and Kinetics of Thermal Decomposition of MgCl₂ x 6H₂O

作者：Huang, Qiong-Zhu[1];Lu, Gui-Min[1];Wang, Jin[1];Yu, Jian-Guo[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2010

卷号：41

期号：5

起止页码：1059

外文期刊名：METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000284333700016)】；

语种：英文

摘要：The reaction mechanism and kinetic behavior of thermal decomposition of MgCl2 x 6H(2)O were studied by thermal gravimetric analysis. The results showed that the thermal decomposition process of MgCl2 x 6H(2)O could be divided into six stages. In the first two stages, four crystalline waters were lost. The dehydration and hydrolysis coexisted during the third and fourth stages. The fifth stage corresponded to the evaporation of 0.3 crystalline waters, and one molecular hydrogen chloride was eliminated in the last stage. The kinetic analysis of the thermal decomposition process was performed using the Doyle, Coats-Redfern, and Malek methods. The results suggested that the mechanisms of six stages were two-dimensional phase boundary mechanism, three-dimensional phase boundary mechanism, nucleation and nuclei growth mechanism (Avrami-Erofeev equation n = 3), two-dimensional phase boundary mechanism, three-dimensional diffusion mechanism (cylinder and G-B equation), and nucleation and nuclei growth mechanism (Avrami-Erofeev equation n = 1), respectively. The apparent active energies of six stages were 66.8 kJ x mol(-1), 138.0 kJ x mol(-1), 77.2 kJ x mol(-1), 135.6 kJ x mol(-1), 77.4 kJ x mol(-1), and 92.2 kJ x mol(-1), respectively. The frequency factors were 3.6 x 10 x s(-1), 8.8 x 10 17 s(-1), 4.6 x 10 x s(-1), 3.0 x 10 14 s(-1), 78.6 s(-1), and 1.2 x 10(3) s(-1), respectively.