Recyclable hydrogen storage system composed of ammonia and alkali metal hydride |
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| Authors: | Hikaru Yamamoto Hiroki Miyaoka Satoshi Hino Haruyuki Nakanishi Takayuki Ichikawa Yoshitsugu Kojima |
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| Affiliation: | 1. Department of Quantum Matter, AdSM, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan;2. Institute for Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan;3. Higashi-Fuji Technical Center, Toyota Motor Corporation, 1200 Misyuku, Susono, Shizuoka 410-1193, Japan |
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| Abstract: | Ammonia (NH3) reacts with alkali metal hydrides MH (M = Li, Na, and K) in an exothermic reaction to release hydrogen (H2) at room temperature, resulting that alkali metal amides (MNH2) which are formed as by-products. In this work, hydrogen desorption properties of these systems and the condition for the recycle from MNH2 back to MH were investigated systematically. For the hydrogen desorption reaction, the reactivities of MH with NH3 were better following the atomic number of M on the periodic table, Li < Na < K. It was confirmed that the hydrogen absorption reaction of all the systems proceeded under 0.5 MPa of H2 flow condition below 300 °C. |
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| Keywords: | Hydrogen storage systems Thermodynamic properties Ammonia Alkali metal hydrides Mechanical milling |
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