Recommendations for the Production of Silicon Carbide‐derived Carbon Based on Intrinsic Kinetic Data
Recommendations for the Production of Silicon Carbide‐derived Carbon Based on Intrinsic Kinetic Data
复制标题
基于本征动力学数据的碳化硅衍生碳生产建议
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
B. Etzold
中科院分区：
文献类型：
--
作者：
T. Knorr;F. Strobl;F. Glenk;B. Etzold
推导了从碳化硅中提取硅以生产纳米多孔碳（碳化物衍生碳，CDC）的操作模式和有关内部传质限制的关键尺寸的建议。这些建议是基于从实验数据得出的内在动力学和瞬态过程的反应工程模拟（收缩核样机制）。当反应发生在1000°C的氯气氛下时，从实验室规模反应器的积分转化数据中提取动力学数据和扩散系数。对不同氯浓度的反应速率依赖关系，用Hougen-Watson型反应速率方法对反应物进行解离吸附是最好的。在1000℃下，氯在纳米孔碳中的有效扩散系数为4·10-8 m2s-1。
Recommendations for mode of operation and critical dimensions regarding inner mass transfer limitation were deduced for the technical extraction of silicon from silicon carbide to produce nanoporous carbon (carbide-derived carbon, CDC). The recommendations are based on intrinsic kinetics derived from experimental data and reaction engineering simulation of the transient process (shrinking-core like mechanism). As the reaction takes place at 1000 °C under chlorine atmosphere, kinetic data as well as diffusion coefficients are extracted from integral conversion data in a lab scale reactor. The reaction rate dependency for varying chlorine concentrations is represented best by a Hougen-Watson type rate approach with dissociative adsorption of a reactant. From the experimental data the effective diffusion coefficient of chlorine in the resulting nanoporous carbon could also be derived to 4 · 10–8 m2s–1 at 1000 °C.