Hydriding kinetics of powders
Hydriding kinetics of powders
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DOI：
10.1016/0925-8388(94)01269-n
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发表时间：
1995-04
影响因子：
6.2
通讯作者：
M. Mintz;Y. Zeiri
中科院分区：
文献类型：
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作者：
M. Mintz;Y. Zeiri
在粉末上进行气固反应的动力学测量，通常是根据单粒子分析(SPA)模型来解释的。使用SPA函数不是先验合理的，因为由于三个因素：(I)颗粒尺寸分布，(Ii)颗粒形状变化和(Iii)组成粉末的每个颗粒开始反应的时间分布，粉末中可能会出现偏离函数依赖关系的情况。定量分析了这些因素的影响，并估计了它们对SPA过程的干扰。结果表明，在一定条件下，SPA可以给出正确的反应机理，甚至可以合理地估计相应的本征动力学参数。这种分析一般与气固动力学有关，特别强调氢化反应。
Kinetic measurements of gas-solid reactions performed on powders, are usually interpreted according to single-particle analysis (SPA) models. The use of SPA functions is not a priori justified, since deviations from that functional dependence may occur in the powder, owing to three factors: (i) particle size distributions, (ii) particle shape variations and (iii) time distributions for the beginning of the reaction on each one of the particles composing the powder. The effects of these factors are quantitatively analysed and their interference in the SPA procedure is estimated. It is concluded that under certain circumstances the SPA can yield the correct reaction mechanism and even enables a reasonable estimate of the corresponding intrinsic kinetic parameters. This analysis is relevant generally to gas-solid kinetics, with particular emphasis on hydriding reactions.