Mg(CH_3COO)_2·4H_2O的热分解机理和动力学研究  

Kinetics and mechanism of thermal decomposition of Mg(CH_3COO)_2·4H_2O

作　　者：孙秋香[1] 宋力[2] 袁良杰[3] 张友祥[3] 张克立[3] 

机构地区：[1]湖北第二师范学院化学系,湖北武汉430205 [2]信阳师范学院化学化工学院,河南信阳464000 [3]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《湖北大学学报（自然科学版）》2009年第3期285-289,共5页Journal of Hubei University：Natural Science

基　　金：国家自然科学基金(20071026);湖北第二师范学院校管重点课题(2007A002)资助

摘　　要：用热分析(TG/DTG/DTA,DSC)、X射线衍射(XRD)技术研究了固态物质Mg(CH3COO)2.4H2O在氩气中热分解过程.热分析结果表明,Mg(CH3COO)2.4H2O在氩气中分两步分解.其质量变化率与理论计算相吻合.XRD结果表明,Mg(CH3COO)2.4H2O分解最终产物为MgO.用Friedman和FWO法对分解过程的活化能E进行了初步计算,依此为初始值,用多元非线性回归得到了分解步骤可能的机理函数和动力学参数.The thermal decomposition processes taking place in the solid state Mg（CH3COO）2·4H2O were studied in Ar with TG/DTG/DTA, DSC and XRD techniques. TG-DTG/DTA, DSC curves showed that, the decomposition proceeds through two well-defined steps in Ar. Mass loss of the thermal decomposition of Mg（CH3COO）2·4H2O is in good agreement with the theoretical mass loss. XRD showed that, the product of the thermal decomposition was MgO. The activation energies of Mg（CH3COO）2 thermal decomposition, as a initial value,were calculated through the Friedman and Flyrm-Wall-Ozawa（FWO）methods, and the possible conversion functions were estimated through the multiple-nonlinear regression method.

关 键 词：Mg(CH3COO)2·4H2O TG/DTG/DTA DSC XRD 热分解 机理 动力学 

分 类 号：O643.23[理学—物理化学]