期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 36, 期 14, 页码 8373-8380出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2011.04.086
关键词
Magnesium amide; Cycle properties; Ammonia by-product; Reaction kinetics; Hydrogen storage
资金
- New Energy and Industrial Technology Development Organization (NEDO), Japan
A magnesium amide-based hydrogen storage material, 3 Mg(NH(2))(2) + 8LiH, was subjected to cycling tests of dehydrogenation and hydrogenation, in which the cyclic trend in the hydrogen storage capacity as well as the amount of the ammonia by-product contained in the desorbed hydrogen gas were recorded. After 300 cycles at 473 K, the initial hydrogen capacity of 4.2 mass% dropped to 3.6 mass%, corresponding to the decay rate of 0.0004 per cycle. The average ammonia concentration through the 300 cycles was determined to be 0.05 +/- 0.01 mol%(NH(3)/H(2)) which is entirely responsible for the hydrogen capacity decay because the ammonia emission leads to the loss of elemental nitrogen from the system. When the dehydrogenation temperature was raised to 573 K, the hydrogen capacity decay became more significant and the ammonia concentration increased to 0.27 +/- 0.06 mol %(NH(3)/H(2)). The reaction kinetics also severely deteriorated during cycling at the higher temperature. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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