Direct synthesis and NMR characterization of calcium alanate

Kabbour, Houria; Ahn, Channing C.; Hwang, Son‐Jong; Bowman, Robert C.; Graetz, Jason

doi:10.1016/j.jallcom.2006.12.050

Cited by 26 publications

(15 citation statements)

References 8 publications

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“…Probably the most common method for the preparation of these materials is a reaction of a binary hydride with a metal halide to form an alanate, as shown below [32,66,71,72] (7) However, these procedures are energetically and economically costly since the expensive alkali metals (e.g., Na) form stable salt (e.g., NaCl) byproducts, which are difficult to separate. Interestingly, many alanates can be prepared directly from AlH 3 and a binary metal hydride in a chemical or mechanochemical reaction [75,76], such as:…”

Section: Synthesismentioning

confidence: 99%

Metastable Metal Hydrides for Hydrogen Storage

Graetz

2012

ISRN Materials Science

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The possibility of using hydrogen as a reliable energy carrier for both stationary and mobile applications has gained renewed interest in recent years due to improvements in high temperature fuel cells and a reduction in hydrogen production costs. However, a number of challenges remain and new media are needed that are capable of safely storing hydrogen with high gravimetric and volumetric densities. Metal hydrides and complex metal hydrides offer some hope of overcoming these challenges; however, many of the high capacity "reversible" hydrides exhibit a large endothermic decomposition enthalpy making it difficult to release the hydrogen at low temperatures. On the other hand, the metastable hydrides are characterized by a low reaction enthalpy and a decomposition reaction that is thermodynamically favorable under ambient conditions. The rapid, low temperature hydrogen evolution rates that can be achieved with these materials offer much promise for mobile PEM fuel cell applications. However, a critical challenge exists to develop new methods to regenerate these hydrides directly from the reactants and hydrogen gas. This spotlight paper presents an overview of some of the metastable metal hydrides for hydrogen storage and a few new approaches being investigated to address the key challenges associated with these materials.

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Section: Synthesismentioning

confidence: 99%

Metastable Metal Hydrides for Hydrogen Storage

Graetz

2012

ISRN Materials Science

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“…Later works about the synthesis of calcium alanate went through a metathesis reaction of CaCl 2 and NaAlH 4 by wet-chemical or mechanochemistry method, thermal dissociation process as well as thermodynamic and kinetic properties of Ca(AlH 4 ) 2 were also illustrated [11][12][13]. Recently, Kabbour et al [14] reported a direct synthesis path of Ca(AlH 4 ) 2 by ball-milling the mixture of AlH 3 and CaH 2 . Besides, it was reported that CaAlH 5 as an important intermediate could also be synthesized by using AlH 3 and CaH 2 [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of calcium alanate and its dehydriding performance enhanced by FeF3 doping

Xiao

Chen

et al. 2011

Journal of Alloys and Compounds

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“…Currently, investigations about Ca(AlH 4 ) 2 were mainly concentrated on the synthetic method and theoretical calculation [10][11][12][13]. It was reported that the Ca(AlH 4 ) 2 and CaAlH 5 can be synthesized using AlH 3 and CaH 2 as primary material [14,15]. CaAlH 5 can hydrogenate/dehydrogenate reversibly by the DSC measurement and DFT calculation [11,16].…”

Section: Introductionmentioning

confidence: 99%