Measurement and modelling of hydriding and dehydriding kinetics

被引:48
作者
Inomata, A [1 ]
Aoki, H [1 ]
Miura, T [1 ]
机构
[1] Tohoku Univ, Dept Chem Engn, Aoba Ku, Sendai, Miyagi 98077, Japan
关键词
kinetics; metal hydride; hydriding rate; dehydriding rate; nucleation and growth;
D O I
10.1016/S0925-8388(98)00008-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The rates of hydriding and dehydriding were measured for LaNi5Hx under isothermal and isobaric conditions. Obtained data of hydriding rates indicated that the rate controlling step was the nucleation and growth process of the hydride phase and then changed to hydrogen diffusion through the hydride phase at the later stage. On the other hand, for the desorption of hydrogen, the rate controlling step was only the homogeneous chemical reaction of the hydride phase. Theoretical rate equations were derived on the basis of the kinetic model of hydriding and dehydriding reaction proposed in this study. A satisfactory agreement between the theoretical and experimental results was obtained. (C) 1998 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:103 / 109
页数:7
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