七水合硫酸亚铁热分解及脱水非等温动力学研究

Studies on the Nonisothermal Kinetics of Thermal Decomposition of Iron(Ⅱ) Sulfate Septhydrate

用ＴＧ，ＤＴＧ技术研究了ＦｅＳＯ４７Ｈ２Ｏ的热分解过程．运用Ａｃｈａｒ法与ＣｏａｔｓＲｅｄｆｅｒｎ法对非等温动力学数据进行分析。

The thermal decomposition of Iron(Ⅱ) sulfate septhydrate and it's kinetics were studied using nonisothermal condition by TG and DTG technique.The nonsiothermal kinetic data were analysed by means of Achar and CoatsRedfern methods.Possible reaction mechanisms have been suggested by comparing the kinetic parameters.The kinetic equotion for the first stage can be expressed as:d α /d t = A e - E/RT ·3(1- α ) 2/3 and for the second stage,d α /d t = A e - E/RT (3/2)(1- α ) -ln(1- α ) 1/3 .Mathematic expression have been derived from the kinetic compensation effects.