A solid-solid reaction enhanced by an inhomogeneous catalyst in the (de)hydrogenation of a lithium-hydrogen-nitrogen system

作者：Zhang Tengfei^*; Isobe Shigehito; Wang Yongming; Hashimoto Naoyuki; Ohnuki Somei

来源：RSC Advances, 2013, 3(18): 6311-6314.

DOI：10.1039/c3ra40379c

The reaction mechanism of the (de) hydrogenation of a LiNH2 + LiH mixture with a nanoscale catalyst has been investigated. In this research, the position of each solid phase was examined by transmission electron microscopy (TEM). The observation showed that LiH particles, around 100 nm in size, formed around LiNH2 in the hydrogenation process. According to in situ TEM observation of the dehydrogenation process, the LiH particles became smaller as they reacted with LiNH2. Fine particles of Li2NH with crystallites of size 30-40 nm formed on the surface of the LiNH2. It indicated that H+ from the LiNH2 moved to the interface and combined with H- from the LiH in the dehydrogenation process, consequently H-2 was released. At the same time, Li+ ions diffused from the LiH to the LiNH2 through the interface and Li2NH formed. On the other hand, it was confirmed that the catalyst was located at the interface between the LiH and LiNH2. It was found that the catalyst had the effect of improving the migration of Li+ from LiH to LiNH2.

• 出版日期2013