Abstract It is easier to optimize reactions when the mechanism is well understood. Nowadays, catalytic carbon gasification is an area of industrial importance. The mechanism based on C-bulk diffusion has been recently updated. The relevance of the Tammann temperature to get efficient carbon/catalyst nanoparticle contact is now better understood. However, the interaction between kinetics and thermodynamics still needs some clarification. Rate jump is a kinetic phenomenon observed in some cases in catalytic carbon gasification by air or oxygen following a minor increase in temperature (v.g. ΔT = 5 °C). This occurrence has been reported, but the phenomenon is not well understood. In this short review, we show that the rate jumps can be consistently explained by the “carbon-worm” mechanism due to a jump in the temperature of the moving nanocatalyst particles. The carbon bulk diffusion step is then much faster and the external film mass transfer becomes the rate-limiting step. The reaction order changes from zero to one. The nature and role of catalyst‑carbon contact in catalytic carbon gasification is discussed.

中文翻译：

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催化碳气化：了解催化剂-碳接触和与空气的速率跳跃行为

摘要 充分理解反应机理后，更容易优化反应。如今，催化碳气化是一个具有重要工业意义的领域。最近更新了基于 C-bulk 扩散的机制。现在更好地理解了塔曼温度与获得有效碳/催化剂纳米颗粒接触的相关性。然而，动力学和热力学之间的相互作用仍然需要一些澄清。速率跳跃是在某些情况下在温度略微升高（vg ΔT = 5 °C）后通过空气或氧气进行催化碳气化时观察到的动力学现象。已经报道了这种情况，但对这种现象的了解还不是很清楚。在这篇简短的评论中，我们表明，由于移动的纳米催化剂颗粒的温度跳跃，可以通过“碳蠕虫”机制一致地解释速率跳跃。然后，碳体扩散步骤要快得多，外部薄膜传质成为限速步骤。反应级数从零变为一。讨论了催化剂-碳接触在催化碳气化中的性质和作用。