Hydrogen absorption and desorption by the Li-Al-N-H system.
Hydrogen absorption and desorption by the Li-Al-N-H system.
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DOI：
10.1021/jp060525z
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发表时间：
2006-04
期刊：
影响因子：
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通讯作者：
Y. Kojima;Mitsuru Matsumoto;Yasuaki Kawai;T. Haga;N. Ohba;K. Miwa;S. Towata;Y. Nakamori;S. Orimo
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文献类型：
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作者：
Y. Kojima;Mitsuru Matsumoto;Yasuaki Kawai;T. Haga;N. Ohba;K. Miwa;S. Towata;Y. Nakamori;S. Orimo
将六氢铝酸锂Li(3)AlH(6)和LiNH2(2)按1：2摩尔比机械球磨，得到Li-Al-N-H体系。LiH(2)在Li(3)AlH(6)的脱氢过程中使Li(3)AlH(6)不稳定，这是因为Li-Al-N-H体系的脱氢起始温度低于Li(3)AlH(6)。程序升温脱附扫描表明，Li-Al-N-H体系在370~773K之间可以放出大量的氢(6.9wt%)。在初始H(2)脱附后，添加纳米Ni催化剂的Li-Al-N-H体系在10~0.004 Mpa和473~573K下的吸放氢容量为3~4wt%，而未加催化剂的Li-Al-N-H体系的吸放氢容量为1~2wt%。容量的显著提高是由于纳米镍催化剂的加入改善了反应动力学。
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.