Catalysis of Lithium Chloride and Alkali Metal Borohydrides on Hydrogen Generation of Ammonia and Lithium Hydride System
2015
Miyaoka, Hiroki | Nakajima, Keita | Yamaguchi, Shotaro | Aoki, Taihei | Yamamoto, Hikaru | Okuda, Takahiro | Goshome, Kiyotaka | Ichikawa, Takayuki | Kojima, Yoshitsugu
The catalytic properties of titanium (Ti), titanium hydride (TiH₂), and ammonia (NH₃) absorbing materials, which are lithium chloride (LiCl), lithium borohydride (LiBH₄), and sodium borohydride (NaBH₄), are investigated to improve the kinetic properties of the hydrogen storage system composed of NH₃ and lithium hydride (LiH). The NH₃ absorbing materials reveal a significant catalytic effect on the hydrogen generation reaction, although Ti is expected as the catalyst. NaBH₄ is the most effective catalyst among them, and then the reaction yield reaches to more than 90% for 12 h, although the yield in the case of LiH without catalysts is less than 50% for 12 h. Furthermore, the catalysis is strongly related to the NH₃ absorption properties of the catalysts. As the catalytic mechanism, it can be proposed that the NH₃ condensation state is realized in the catalysts and improves the kinetic properties, such as the frequency factor.
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