非均相气固反应的广义动力学模型
A Generalized Kinetic Model for Heterogeneous Gas-Solid Reactions
摘要：
本文提出了一个气固两相界面非均相反应的广义动力学模型。该模型通过考虑界面处的反应以及产物层内的传输过程来研究反应动力学。标准的未反应收缩核模型依赖于准静态扩散的假设，该假设导致产物层中气体反应物的稳态浓度分布。通过放松这一假设并解决整个问题，可以获得反应动力学的一般解，包括反应前沿速度和转化率（反应固体的体积分数）。未反应的收缩核模型被证明是准确的，并与广义模型的反应慢（或快速扩散），低浓度的气体反应物，和小固体尺寸。否则，应使用广义动力学模型。
英文摘要：
We present a generalized kinetic model for gas-solid heterogeneous reactions taking place at the interface between two phases. The model studies the reaction kinetics by taking into account the reactions at the interface, as well as the transport process within the product layer. The standard unreacted shrinking core model relies on the assumption of quasi-static diffusion that results in a steady-state concentration profile of gas reactant in the product layer. By relaxing this assumption and resolving the entire problem, general solutions can be obtained for reaction kinetics, including the reaction front velocity and the conversion (volume fraction of reacted solid). The unreacted shrinking core model is shown to be accurate and in agreement with the generalized model for slow reaction (or fast diffusion), low concentration of gas reactant, and small solid size. Otherwise, a generalized kinetic model should be used.
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