TY - JOUR
T1 - Dehydriding and rehydriding properties of Mg(NH2)2-LiH systems
AU - Aoki, M.
AU - Noritake, T.
AU - Nakamori, Y.
AU - Towata, S.
AU - Orimo, S.
N1 - Funding Information:
The authors would like to thank K. Miwa and N. Ohba for valuable discussion. This work was partially supported by the New Energy and Industrial Technology Development Organization (NEDO), “Development of Safe Utilization Technology and an Infrastructure for Hydrogen Use (2003–2006)”.
PY - 2007/10/31
Y1 - 2007/10/31
N2 - The dehydriding and rehydriding properties of the mixtures of 3Mg(NH2)2 + nLiH (n = 6, 8, and 12) were investigated by pressure-composition (p-c) isotherm and X-ray diffraction (XRD) measurements in order to clarify the effects of the LiH ratio n on the properties. The amounts of the hydrogen desorbed from the mixtures with n = 6, 8, and 12 were 5.4, 5.1, and 4.5 mass%, respectively; this indicates that the amounts on a unit mass basis decrease with increasing n. However, the molar ratios of the desorbed hydrogen to the mixtures estimated from the amounts were almost equal, and also the features of the p-c isotherms were similar to each other. Moreover, the Li2Mg(NH)2 and LiH phases were observed in XRD profiles of all the mixtures after p-c isotherm measurements. These results suggest that the dehydriding reaction of the mixtures of 3Mg(NH2)2 + nLiH (n = 6, 8, and 12) under hydrogen pressure is not dominantly affected by the value of n. On the other hand, the amounts of the ammonia desorbed from the mixtures detected by mass spectroscopy decreased with increasing n.
AB - The dehydriding and rehydriding properties of the mixtures of 3Mg(NH2)2 + nLiH (n = 6, 8, and 12) were investigated by pressure-composition (p-c) isotherm and X-ray diffraction (XRD) measurements in order to clarify the effects of the LiH ratio n on the properties. The amounts of the hydrogen desorbed from the mixtures with n = 6, 8, and 12 were 5.4, 5.1, and 4.5 mass%, respectively; this indicates that the amounts on a unit mass basis decrease with increasing n. However, the molar ratios of the desorbed hydrogen to the mixtures estimated from the amounts were almost equal, and also the features of the p-c isotherms were similar to each other. Moreover, the Li2Mg(NH)2 and LiH phases were observed in XRD profiles of all the mixtures after p-c isotherm measurements. These results suggest that the dehydriding reaction of the mixtures of 3Mg(NH2)2 + nLiH (n = 6, 8, and 12) under hydrogen pressure is not dominantly affected by the value of n. On the other hand, the amounts of the ammonia desorbed from the mixtures detected by mass spectroscopy decreased with increasing n.
KW - Amide
KW - Crystal structure
KW - Gas-solid reaction
KW - Hydrogen storage materials
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U2 - 10.1016/j.jallcom.2006.11.141
DO - 10.1016/j.jallcom.2006.11.141
M3 - Article
AN - SCOPUS:35148817582
SN - 0925-8388
VL - 446-447
SP - 328
EP - 331
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -