A Systematic Study of the Effects of Metal Chloride Additives on H2 Desorption Properties of Ammonia Borane

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• 作者：Yuki Nakagawa ; Tengfei Zhang ; Masaumi Kitamura ; Shigehito Isobe ; Satoshi Hino ; Naoyuki Hashimoto ; Somei Ohnuki
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：May 12, 2016
• 年：2016
• 卷：61
• 期：5
• 页码：1924-1929
• 全文大小：383K
• 年卷期：0
• ISSN：1520-5134

文摘

The effects of metal-based additives in a wide range of elements doping into ammonia borane (AB) were systematically investigated. Pure transition metals in period 4 and total of 17 metal chlorides were selected as additives and ball-milled with AB. Metal chloride additives were effective to decrease H₂ desorption temperature and the amounts of byproduct gas emissions of AB, whereas pure transition metals did not show any ability because they did not work as Lewis acids. The strong correlation between H₂ desorption temperature and the Pauling electronegativity of metal (χ_p) was observed. Mⁿ⁺ of MCl_n would work as Lewis acid to initiate the AB dehydrocoupling reaction. The amount of NH₃ emission was correlated with the ionic radius of M, suggesting MCl_n·mNH₃ complexes be formed in this system. AB–CuCl₂ and AB–AgCl mixtures showed the similar H₂ desorption processes. The Cl-containing intermediate phase would destabilize AB during reaction.