Hydrogen absorption and desorption by the Li-Al-N-H system.
Lithium hexahydridoaluminate Li(3)AlH(6) and lithium amide LiNH(2) with 1:2 molar ratio were mechanically milled, yielding a Li-Al-N-H system. LiNH(2) destabilized Li(3)AlH(6) during the dehydrogenation process of Li(3)AlH(6), because the dehydrogenation starting temperature of the Li-Al-N-H system was lower than that of Li(3)AlH(6). Temperature-programmed desorption scans of the Li-Al-N-H system indicated that a large amount of hydrogen (6.9 wt %) can be released between 370 and 773 K. After initial H(2) desorption, the H(2) absorption and the desorption capacities of the Li-Al-N-H system with a nano-Ni catalyst exhibited 3-4 wt % at 10-0.004 MPa and 473-573 K, while the capacities of the system without the catalyst were 1-2 wt %. The remarkably increased capacity was due to the fact that the kinetics was improved by addition of the nano-Ni catalyst.
Kojima
Yoshitsugu
Y
Toyota Central R&D Labs, Inc., Nagakute-cho, Aichi-gun, Aichi, 480-1192, Japan. kojima@mosk.tytlabs.co.jp
Matsumoto
Mitsuru
M
Kawai
Yasuaki
Y
Haga
Tetsuya
T
Ohba
Nobuko
N
Miwa
Kazutoshi
K
Towata
Shin-ichi
S
Nakamori
Yuko
Y
Orimo
Shin-ichi
S