CaCO3与MoO3固相反应机理

采用非等温热重分析法对CaCO3与MoO3固相反应动力学进行了研究，由热重曲线及转化率分别拟合选取的13种固相反应机理函数，通过Coats-Refern方程分别求得活化能和指前因子，根据动力学参数及线性相关性判定该固相反应机理函数. 结果表明，CaCO3和MoO3于450℃开始反应，且速度较快，反应机理为随机成核随后生长，反应模型的积分形式为g(a)=-ln(1-a)，活化能和指前因子分别为170.2 kJ/mol和1.3×107 s-1.

Mechanism of Solid State Reaction between CaCO3 and MoO3

Solid state reaction between CaCO3 and MoO3 was studied using non-isothermal thermal analysis method. On the basis of TG curve and extent of reaction, the chosen 13 solid reaction mechanism functions were fitted respectively. The Coats-Redfern method used for model fitting and kinetic parameter was calculated by slope and intercept. The results indicate that the reaction between CaCO3 and MoO3 begins at 450℃, its reaction mechanism belongs to random nucleation and growth with integral form g(α)=-ln(1-α), the apparent activation energy is determined to be about 170.2 kJ/mol with pre-exponential factor of about 1.3×107 s-1.