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Rare Metals
Erschienen in: Rare Metals 6/2017

21.06.2016

Direct synthesis and dehydrogenation properties of NaAlH4 catalyzed with ball-milled Ti–B

verfasst von: Li Li, Zi-Chao Zhang, Yi-Jing Wang, Li-Fang Jiao, Hua-Tang Yuan

Erschienen in: Rare Metals | Ausgabe 6/2017

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Abstract

Ball-milled Ti–B-doped sodium aluminum hydride was directly synthesized via mechanical ball-milling of a NaH/Al mixture. The mixture was completely hydrogenated to NaAlH4 after 70 h under hydrogen pressure of 1 MPa. And higher hydrogen pressure is beneficial for the conversion from NaH/Al mixture to NaAlH4. The dehydrogenation properties of the as-synthesized Ti–B-doped sodium aluminum were systematically investigated. The result shows that ball-milled Ti–B has a remarkable catalytic effect on the enhanced dehydrogenation properties of NaAlH4. As-synthesized Ti–B-doped NaAlH4 sample releases hydrogen at the temperature of about 100 °C. Approximately 4.15 wt% H2 is released from ball-milled Ti–B-doped NaAlH4 at 233.7 °C. Even at 110 °C, it also releases about 2.83 wt% hydrogen. The apparent activation energy (E a) for the first step is estimated to be 83.97 kJ·mol−1 using Arrhenius equation. Thus, utilization of ball-milled Ti–B as catalyst would substantially enhance the practical applications of NaAlH4 for hydrogen storage.
Vorheriger Artikel Enhanced thermoelectric property and stability of NiCr–NiSi thin film thermocouple on superalloy substrate
Nächster Artikel Through-thickness texture gradient of tantalum sputtering target

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Metadaten
Titel
Direct synthesis and dehydrogenation properties of NaAlH4 catalyzed with ball-milled Ti–B
verfasst von
Li Li
Zi-Chao Zhang
Yi-Jing Wang
Li-Fang Jiao
Hua-Tang Yuan
Publikationsdatum
21.06.2016
Verlag
Nonferrous Metals Society of China
Erschienen in
Rare Metals / Ausgabe 6/2017
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI
https://doi.org/10.1007/s12598-016-0772-x

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