Regeneration of spent-NaBH4 back to NaBH4 by using high-energy ball milling

Hsueh, Chan Li; Liu, Cheng‐Hong; Chen, Bing‐Hung; Chen, Chuh Yung; Kuo, Yi Chia; Hwang, Kuo Jen; Ku, Jie Ren

doi:10.1016/j.ijhydene.2008.12.036

Cited by 78 publications

(43 citation statements)

References 11 publications

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“…Furthermore, a high NaBH4 yield of 89.78% was achieved by this method, which is the highest compared with previous studies [67,69,78]. …”

Section: Nabh 4 Regeneration Via the Reaction Between Metal Or Other mentioning

confidence: 49%

“…It was found that the regenerated NaBH4 from NaBO2•xH2O had an excellent hydrolysis property, which was similar to the commercial NaBH4. According to Figure 3, the highest system hydrogen capacity (containing water and catalyst) was 6.75 wt %, which was the highest compared with previous studies [67,69,78]. It was produced by the reaction between MgH2 and NaBO2•xH2O.…”

Section: Hydrolysis Property Of Regenerated Nabh4 Using Nabo2•xh2o Asmentioning

confidence: 76%

“…NaBH 4 Regeneration via the Reaction between Mg 2 Si and NaBO 2 ·2H 2 O Via ball milling hydrated NaBO 2 and Mg, NaBH 4 was regenerated and the energy efficiency was further increased. However, the highest NaBH 4 yield by this method was 68.55%, which did not reach the general yield of regenerated NaBH 4 (~76%) [67,68]. According to Kojima et al [66], with Si added, the NaBH 4 yield was increased in the reaction between NaBO 2 and Mg under a hydrogen atmosphere.…”

Section: Nabh 4 Regeneration Via the Reaction Between Mg And Nabo 2 ·mentioning

confidence: 77%

“…Therefore, the thermochemistry method was substituted by room temperature ball milling in this reaction. Hsueh et al [67], Kong et al [68] and Çakanyildirim et al [69] used MgH2 to react with NaBO2 by ball milling under argon. All of their NaBH4 yields were over 70%, which strongly indicated that ball milling is suitable for the reaction between MgH2 and NaBO2.…”

Section: Nabh4 Regeneration Via the Reaction Between Metal Or Other Hmentioning

confidence: 99%

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A Recycling Hydrogen Supply System of NaBH4 Based on a Facile Regeneration Process: A Review

Ouyang

Zhong

et al. 2018

Inorganics

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NaBH 4 hydrolysis can generate pure hydrogen on demand at room temperature, but suffers from the difficult regeneration for practical application. In this work, we overview the state-of-the-art progress on the regeneration of NaBH 4 from anhydrous or hydrated NaBO 2 that is a byproduct of NaBH 4 hydrolysis. The anhydrous NaBO 2 can be regenerated effectively by MgH 2 , whereas the production of MgH 2 from Mg requires high temperature to overcome the sluggish hydrogenation kinetics. Compared to that of anhydrous NaBO 2 , using the direct hydrolysis byproduct of hydrated NaBO 2 as the starting material for regeneration exhibits significant advantages, i.e., omission of the high-temperature drying process to produce anhydrous NaBO 2 and the water included can react with chemicals like Mg or Mg 2 Si to provide hydrogen. It is worth emphasizing that NaBH 4 could be regenerated by an energy efficient method and a large-scale regeneration system may become possible in the near future.

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“…Furthermore, a high NaBH4 yield of 89.78% was achieved by this method, which is the highest compared with previous studies [67,69,78]. …”

Section: Nabh 4 Regeneration Via the Reaction Between Metal Or Other mentioning

confidence: 49%

Section: Hydrolysis Property Of Regenerated Nabh4 Using Nabo2•xh2o Asmentioning

confidence: 76%

Section: Nabh 4 Regeneration Via the Reaction Between Mg And Nabo 2 ·mentioning

confidence: 77%

Section: Nabh4 Regeneration Via the Reaction Between Metal Or Other Hmentioning

confidence: 99%

See 2 more Smart Citations

A Recycling Hydrogen Supply System of NaBH4 Based on a Facile Regeneration Process: A Review

Ouyang

Zhong

et al. 2018

Inorganics

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“…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

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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 ...

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Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

Ouyang

Chen

Liu

et al. 2017

Advanced Energy Materials

353

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Sodium borohydride (NaBH4) is regarded as an excellent hydrogen‐generated material, but its irreversibility of hydrolysis and high cost of regeneration restrict its large‐scale application. In this study a convenient and economical method for NaBH4 regeneration is developed for the first time without hydrides used as starting materials for the reduction process. The real hydrolysis by‐products (NaBO2·2H2O and NaBO2·4H2O), instead of dehydrated sodium metaborate (NaBO2), are applied for the regeneration of NaBH4 with Mg at room temperature and atmospheric pressure. Therefore, the troublesome heat‐wasting process to obtain NaBO2 using a drying procedure at over 350 °C from NaBO2·xH2O is omitted. Moreover, the highest regeneration yields of NaBH4 are achieved to date with 68.55% and 64.06% from reaction with NaBO2·2H2O and NaBO2·4H2O, respectively. The cost of NaBH4 regeneration shows a 34‐fold reduction compared to the previous study that uses MgH2 as the reduction agent, where H2 is obtained from a separate process. Furthermore, the regeneration mechanism of NaBH4 is clarified and the intermediate compound, NaBH3(OH), is successfully observed for the first time during the regeneration process.

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Regeneration of spent-NaBH4 back to NaBH4 by using high-energy ball milling

Cited by 78 publications

References 11 publications

A Recycling Hydrogen Supply System of NaBH4 Based on a Facile Regeneration Process: A Review

A Recycling Hydrogen Supply System of NaBH4 Based on a Facile Regeneration Process: A Review

Sodium borohydride production and utilisation for improved hydrogen storage

Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

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Regeneration of spent-NaBH4 back to NaBH4 by using high-energy ball milling

Cited by 78 publications

References 11 publications

A Recycling Hydrogen Supply System of NaBH4 Based on a Facile Regeneration Process: A Review

A Recycling Hydrogen Supply System of NaBH4 Based on a Facile Regeneration Process: A Review

Sodium borohydride production and utilisation for improved hydrogen storage

Enhancing the Regeneration Process of Consumed NaBH4 for Hydrogen Storage

Contact Info

Product

Resources

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Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage