Catalysis of Lithium Chloride and Alkali Metal Borohydrides on Hydrogen Generation of Ammonia and Lithium Hydride System

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• 作者：Hiroki Miyaoka ; Keita Nakajima ; Shotaro Yamaguchi ; Taihei Aoki ; Hikaru Yamamoto ; Takahiro Okuda ; Kiyotaka Goshome ; Takayuki Ichikawa ; Yoshitsugu Kojima
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：August 27, 2015
• 年：2015
• 卷：119
• 期：34
• 页码：19922-19927
• 全文大小：369K
• ISSN：1932-7455

文摘

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.