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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Concept of variable activation energy and its validity in nonisothermal kinetics
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Concept of variable activation energy and its validity in nonisothermal kinetics

机译：可变活化能的概念及其在非等温动力学中的有效性

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摘要

The concept of variable activation energy in solid-state kinetics under nonisothermal conditions has been suffering from doubt and controversy. Rate equations of nonisothermal kinetics of solid decomposition, which involve the factors of thermodynamics conditions, pressure of gaseous product, structure parameters of solid, and/or extent of conversion, are derived from the models of the interface reaction, the diffusion of gaseous product, and the nuclei growth of the solid product, respectively. The definition of the validity function in the rate equations represents the influence of the factors on the reaction rate. A function of variable activation energy depending on the validity function is also developed. The changing trend and degree of activation energy are extrapolated from the function of variable activation energy and based on the data of nonisothermal thermal decomposition of calcium carbonate. It is shown that the concept of variable activation energy is meaningfully applicable to solid-state reactions under nonisothermal conditions.
机译：非等温条件下固态动力学中可变活化能的概念一直受到质疑和争议。固体分解的非等温动力学的速率方程，包括热力学条件，气态产物的压力，固体的结构参数和/或转化程度等因素，是从界面反应模型，气态产物的扩散，和固体产物的核生长。速率方程中有效性函数的定义表示因素对反应速率的影响。还开发了取决于有效性函数的可变激活能量的函数。活化能的变化趋势和程度是根据可变活化能的函数并基于碳酸钙的非等温热分解数据推断出来的。结果表明，可变活化能的概念可有意义地应用于非等温条件下的固态反应。

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