Reactions in the SrH2–Al–H2 system

Zhang, Q.A.; Akiba, Etsuo

doi:10.1016/j.jallcom.2007.06.004

Cited by 18 publications

(12 citation statements)

References 14 publications

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“…However, the sample still contains about 30% SrH 2 . The sample was shown to slowly release hydrogen at 1.3 MPa and 260 C forming SrH 2 and Al, indicating that the reaction is reversible [203]. Keeping Sr 2 AlH 7 under lower pressures (below 1.76 MPa) leads to the formation of SrAl 4 .…”

Section: Sr 2 Alhmentioning

confidence: 99%

“…Using SrAl 2 as educt, the alloy can be hydrogenated to SrAl 2 H 2 at 463 K and to Sr 2 AlH 7 at 240 C [199][200][201]. Another possibility for the synthesis of Sr 2 AlH 7 is to ball mill Sr 2 Al alloy under hydrogen followed by additional hydrogenation [202,203]. Ball milling of Sr 2 Al under 0.6 MPa hydrogen for 10 h leads first to the formation of SrH 2 and Al.…”

Section: Sr 2 Alhmentioning

confidence: 99%

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Complex Hydrides

and

Felderhoff

2010

Handbook of Hydrogen Storage

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Complex hydrides are salt-like materials in which hydrogen is covalently bound to the central atoms, in this way a crystal structure consisting of so-called complex anions is formed. In general, complex hydrides have the chemical formula A x Me y H z . Compounds where position A is preferentially occupied by elements of the first and second groups of the periodic table and Me is occupied either by boron or aluminum are well known and have been intensively investigated. However, another possibility is that complex hydrides are built by transition metal cations. Complex metal hydrides have been known for more than 50 years, but for many years they were not considered for reversible hydrogen storage due to the high kinetic barriers of the decomposition requiring high temperatures. The situation changed in 1997 when Bogdanovi c and Schwickardi discovered that the kinetic barrier of the decomposition of the complex metal hydride, NaAlH 4 , can be lowered by the addition of Ti catalysts and that the material becomes reversible close to acceptable technical conditions [1]. They further showed not only that catalysts can enhance the kinetics of dehydrogenation but also that rehydrogenation under moderate conditions becomes feasible. This breakthrough induced the publication of a tremendous number of papers focusing on the synthesis and the properties of complex hydrides. The major goal is to understand the basic steps of dehydrogenation and rehydrogenation and the role of catalysts. Many complex metal hydrides have high hydrogen gravimetric storage capacities and some of them are commercially available. Some complex hydride systems, such as Mg 2 FeH 6 and Al(BH 4 ) 3 , have an extremely high volumetric hydrogen density of up to 150 kg m À3 . Compared to liquid hydrogen with a volumetric density of 70 kg m À3 , the amount of hydrogen in such metal hydrides is much higher. This makes complex transition metal hydrides interesting as potential storage materials.Handbook of Hydrogen Storage. Edited by Michael Hirscher

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Section: Sr 2 Alhmentioning

confidence: 99%

Section: Sr 2 Alhmentioning

confidence: 99%

Complex Hydrides

and

Felderhoff

2010

Handbook of Hydrogen Storage

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“…Further studies indicate that it can also be synthesized by the reaction of SrH 2 , Al and hydrogen 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Thermal Dehydrogenation Characteristics of Li-Sr-Al-N-H Hydrogen Storage System

Zhang

et al. 2017

Mat. Res.

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Thermolysis behavior of the Li-Sr-Al-N-H hydrogen storage system prepared by ball milling of Sr 2 AlH 7 + LiNH 2 mixture was investigated in this paper. The results show that thermal decomposition of the Li-Sr-Al-N-H system proceeds mainly in two steps with only hydrogen desorption. The thermal stability of this system is lowered as compared to the individual starting material, resulting in the hydrogen desorption initiating from about 125 °C. In addition, about 0.91 and 1.53 wt.% of hydrogen can be isothermally desorbed within 180 min at 180 and 330 °C, respectively. The decreased thermal stability of the Li-Sr-Al-N-H system might be attributed to the chemical reactions between the starting materials during the heating process with the formation of LiSrH 3 and N-containing amorphous phases.

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“…Further investigation showed that Sr 2 AlH 7 can also be synthesized by the reaction of SrH 2 , Al and hydrogen at 533 K [9]. In view of the enthalpy change for the formation of Sr 2 AlH 7 from SrH 2 + Al + H 2 , Sr 2 AlH 7 can be considered as a possible candidate for hydrogen storage application [10].…”

Section: Introductionmentioning

confidence: 99%