Empirical kinetic model of sodium alanate reacting system (II). Hydrogen desorption

✍ Scribed by Gustavo A. Lozano; Chakkrit Na Ranong; Jose M. Bellosta von Colbe; Rüdiger Bormann; Georg Fieg; Jobst Hapke; Martin Dornheim

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 669 KB
• Volume: 35
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.04.142

✦ Synopsis

Simulation and design of hydrogen storage systems based on metal hydrides require appropriate quantitative kinetic description. This paper presents an empirical kinetic model for the two-step hydrogen desorption of sodium alanate material doped with aluminium-reduced TiCl 4 , produced in kg-scale. The model is based on kinetic data obtained by volumetric titration measurements within a range of experimental conditions varying from 0 bar to 35 bar and from 100 C to 190 C. It is shown that while the first desorption step is a zero-order reaction, the second desorption step follows the Johnsone MehleAvrami (JMA) equation with n ¼ 1. The predictions of the model are validated by experimental results and are used to asses the pressureetemperature ( peT ) performance of the desorption steps against selected hydrogen supply criteria. This paper complements a previous paper of this investigation that presented the kinetic model of the corresponding hydrogen absorption of sodium alanate material.