钨酸钠二水合物脱水过程的动力学研究

Non-Isothermal Kinetics of Dehydration Process of Na_2WO_4·2H_2O

采用TG DTG技术研究了钨酸钠二水合物在静态空气中的热分解过程及动力学 ,其热分解呈现一步脱水过程。运用Malek等提出的热分析动力学数据处理方法 ,确定了脱水过程的动力学模型为SB(m ,n) ,并求得相应动力学参数 ,活化能E为 91 3 2kJ·mol- 1 ,指前因子lnA为 2 9 65。

The thermal decomposition of Na 2WO 4·2H 2O and its kinetics was studied in a static air by TG-DTG. The thermal decomposition process of the Na 2WO 4·2H 2O occurred in one stage. By the kinetic method of processing thermal analysis data put forward by Malek et al, it is defined that the kinetics model for the dehydration process in SB(m, n). The activation energy E and the pre-exponential factor lnA for this step reaction are 91 32 and 29.65 kJ·mol -1, respectively.