用热分析方法研究WO_(3)和Me_(2)CO_(3)固相反应的化学行为

Study on the Chemical Behavior of Solid Phase Reaction of WO_(3) and Me_(2)CO_(3) by the Method of Thermal Analysis

本文应用MOM型-Derivatograph热分析仪研究了WO_(3)与Me_(2)CO_(3)(Me=Li,Na,K,Rb,Cs)系列的固相反应.由TG和DTA二曲线指示了反应变化的全过程.对热分析的TG曲线,以Coats-Redfern计算方法处理,求取反应活化能(E),反应级数(n),频率因子(A)和速度常数(K)等动力学参数.此外,用Kissinger方法算得Na2CO_(3)与WO_(3)系统的E值(372.0千焦/摩尔)与Coats-Redfern方法计算的E值(347.8千焦/摩尔)相接近.

The reaction of WO_(3) and Me_(3)CO (Me = Li, Na, K, Rb, Cs) series in solid phase has been studied by using the MOM type-Derivatograph. The chemical behavior of reaction process was indicated by TG and DTA curves. The kinetic parameters, activation energy (E), reaction order (n), frequency factor (A) and reaction velocity constant (K) were evaluated by treating TG curves with Coats-Redfern method.For the system of WO_(3)+Na_(2)CO_(3), the E value calculated by Coats-Redfern method (347.8 KJ/mol) is consistent with the value (372.9 KJ/mol) obtained by Kissinger method.