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Self-ignition combustion synthesis of LaNi5 utilizing hydrogenation heat of metallic calcium

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Title: Self-ignition combustion synthesis of LaNi5 utilizing hydrogenation heat of metallic calcium
Authors: Yasuda, Naoto Browse this author
Sasaki, Shino Browse this author
Okinaka, Noriyuki Browse this author
Akiyama, Tomohiro Browse this author
Keywords: Hydrogen storage alloy
Combustion synthesis
Calciothermic reduction
Gas-solid reaction
Issue Date: Oct-2010
Publisher: ELSEVIER
Volume: 35
Issue: 20
Start Page: 11035
End Page: 11041
Publisher DOI: 10.1016/j.ijhydene.2010.07.034
Abstract: This paper describes self-ignition combustion synthesis (SICS) of LaNi5 in a pressurized hydrogen atmosphere using metallic calcium as both the reducing agent and the heat source. In this study, the effects of hydrogen on the ignition temperature and the hydrogenation properties of the products were mainly examined. In the experiments, La2O3, Ni, and Ca were dry-mixed in the molar ratio of 1:10:6 and then heated up at a hydrogen pressure of 1.0 MPa until the ignition due to the hydrogenation of calcium. For the sake of comparison, the same experiments were performed in a normal argon atmosphere. The results showed that the ignition temperature was drastically lowered by hydrogen; it was only 600 K in the case of hydrogen as compared to 1.100K in the case of argon. The products also exhibited high initial activity and hydrogen storage capacity of 1.54 mass%. The proposed method offers many benefits for using cost-effective rare-earth oxide, saving productive time and energy, improving initial activity of the product and applying to any AB(5)-type hydrogen storage alloy. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 安田 尚人

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