Production of sodium borohydride by using dynamic behaviors of protide at the extreme surface of magnesium particles

Suda, S.; Morigasaki, N.; Iwase, Yukari; Li, Z.P.

doi:10.1016/j.jallcom.2005.02.101

Cited by 51 publications

(42 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It starts from NaBO 2 and Mg and uses the ball-milling process in a hydrogen atmosphere [56]. Under these conditions highly reactive MgH 2 is produced, which reduces NaBO 2 directly to NaBH 4 .…”

Section: Regeneration Of Decomposed Nabh 4 In Solutionmentioning

confidence: 99%

Complex Hydrides

and

Felderhoff

2010

Handbook of Hydrogen Storage

View full text Add to dashboard Cite

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

show abstract

Section: Regeneration Of Decomposed Nabh 4 In Solutionmentioning

confidence: 99%

Complex Hydrides

and

Felderhoff

2010

Handbook of Hydrogen Storage

View full text Add to dashboard Cite

show abstract

“…In this reaction sodium metaborate (NaBO 2 ) is the by-product and can be recycled to re-prepare NaBH 4 [18]. This can be carried out in different ways, e.g., thermo chemical process, and by various catalytic routes [1,[20][21][22] with the general equation given in Eq. (2): NaBO 2 (s) + 2H 2 catalyst −→ NaBH 4 (s) + Re x O 2 (l) (2) here Re is reducing agent (Al, Na, and Ca, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…and chemical hydride (MgH 2 ) [20,21]. As H 2 is a clean energy carrier, environmentally friendly and is the most abundant element, the H 2 production from sustainable resources such as water is the most appealing avenue [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Macroporous cryogel metal nanoparticle composites for H2 generation from NaBH4 hydrolysis in seawater

Şahiner

Yıldız

Şahiner

et al. 2015

Applied Surface Science

View full text Add to dashboard Cite

“…The yield was found to increase from 43% to 78% with the addition of Na 2 CO 3 to compensate for the Na deficiency of borax [131]. (2005) estimated that using a Mg-based process to synthesise NaBH 4 could reduce its production cost by a factor of 20 [133].…”

Section: Regeneration With Metals/metal Hydridesmentioning

confidence: 99%

“…Several studies have demonstrated the MgH 2 ball milling process with NaBO 2 as the boron source, which is more useful for NaBH 4 regeneration in this context [134][135][136]. The latter reaction has been demonstrated using pure Mg instead of Mg 2 Si [133], and the yield and kinetics were shown to be improved by using Mg alloyed with 23.5 wt% Ni (which was thought to be due to enhanced MgH 2 formation) [137].…”

Section: Regeneration With Metals/metal Hydridesmentioning

confidence: 99%

Sodium borohydride production and utilisation for improved hydrogen storage

Muir¹

View full text Add to dashboard Cite

Sodium borohydride (NaBH 4 ) has been the subject of extensive investigation as a potential hydrogen storage material. Its advantages include its ability to be stored as a stabilised aqueous solution and hydrolysed catalytically on demand, providing hydrogen safely, controllably, and at mild conditions. However, several drawbacks were identified by the US Department of Energy (DOE) in their "No-Go" recommendation in 2007; namely, the limitations on its gravimetric hydrogen storage capacity (GHSC) and its prohibitive manufacturing cost.This thesis aims to address some of the major issues associated with the use of NaBH 4 for hydrogen storage. Efforts have been spread across three key research areas, which were identified in a review of the recent literature: Synthesising an efficient, durable, and inexpensive catalyst for the hydrolysis of aqueous NaBH 4 solution  The design of a hydrogen storage system based on NaBH 4 which can overcome the GHSC constraints imposed by the solubility of its hydrolysis by-product, NaBO 2  The development of a novel recycling process for regenerating NaBH 4 from NaBO 2 , with the goal of reducing its production cost to within the DOE's target range of $2-4 per gallon of gasoline equivalent (gge) To achieve the first goal, a new electroless plating method was developed for preparing cobalt-boron (Co-B) catalysts supported on shaped substrates. This method involves mixing the plating solutions at low temperature (<5 o C), in contrast to previously employed methods, which are generally carried out at room temperature or higher. The new method requires only one plating step to achieve the desired catalyst loading, and has higher loading efficiency than processes requiring multiple plating steps, due to reduced catalyst wastage. The catalysts produced by this method show significantly higher NaBH 4 hydrolysis activity than those prepared by conventional methods, with a hydrogen generation rate over 24000 mL/min/g recorded at a temperature of 30 o C and a NaBH 4 concentration of 15 wt%. The improved activity of these catalysts was thought to be due to their increased boron content and nanosheet-like morphology, both of which are products of the low temperature preparation method.ii The stability of these catalysts was examined over several usage and deactivation cycles, which involved long-term exposure to alkaline solution. It was found that the deactivated catalysts were able to recover 80-90% of their initial activity even after 10 cycles, if operated at 40 o C or higher. Characterisation of the deactivated catalysts revealed that a layer of NaBO 2 had formed on the surface, blocking the catalytically active Co sites. The improved cyclic stability is most likely due to the dissolution of this layer at higher temperatures.A new reactor design for a NaBH 4 -based hydrogen storage system was developed, with the goal of overcoming the GHSC limitations encountered by conventional system designs. The new design is based on a fed-batch configuration in which solid NaBH 4 is added ...

show abstract

Production of sodium borohydride by using dynamic behaviors of protide at the extreme surface of magnesium particles

Cited by 51 publications

References 22 publications

Complex Hydrides

Complex Hydrides

Macroporous cryogel metal nanoparticle composites for H2 generation from NaBH4 hydrolysis in seawater

Sodium borohydride production and utilisation for improved hydrogen storage

Contact Info

Product

Resources

About