ZnAc_2·2H_2O在空气中的热分解动力学研究  

Kinetics of Thermal Decomposition of ZnAc_2·2H_2O in Air Atmosphere

作　　者：从长杰[1] 罗仕婷[1] 陶友田[1] 张克立[1] 

机构地区：[1]武汉大学化学与分子科学学院,武汉430072

出　　处：《高等学校化学学报》2005年第12期2327-2330,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20071026)资助

摘　　要：用TG/DTA,DSC和XRD技术研究了固态物质ZnAc2.2H2O在空气中的热分解过程.结果表明,ZnAc2.2H2O在空气中发生两步分解,其失重率与理论计算失重率相符.XRD结果表明,ZnAc2.2H2O分解的最终产物为ZnO.用Friedm an法和F lynn-W all-Ozawa(FWO)法求得分解过程的活化能E,并通过多元线性回归方法给出了可能的机理函数.ZnAc2.2H2O在空气中两步分解的活化能分别为119.82和66.82 kJ/mol.The thermal decomposition processes occurring in the solid state ZnAc2·2H2O were studied in air atmosphere by using TG-DTG/DTA, DSC and XRD techniques. TG-DTG/DTA, DSC curves show that the decomposition proceeded through two well-defined steps in air atmosphore. Mass loss of the thermal decomposiion of ZnAc2·2H2O is in good agreement with the theoretical mass loss. XRD shows that the final product of the thermal decomposition was ZnO. The activation energies were calculated through the Friedman and Flynn- Wall-Ozawa（FWO） methods, and the possible conversion functions were estimated through the multiple-linear regression method. The activation energies for the two decomposition reactions of ZnAc2·2H2O were 119.82 and 66.82 kJ/mol, respectively.

关 键 词：TG/DTG/DTA DSC 热分解 机理 动力学 

分 类 号：O643.12[理学—物理化学]