Durability and reutilization capabilities of a Ni–Ru catalyst for the hydrolysis of sodium borohydride in batch reactors

Pinto, A.M.F.R.; Ferreira, M. J.; Fernandes, Vitor R.; Rangel, C. M.

doi:10.1016/j.cattod.2011.03.051

Cited by 33 publications

(14 citation statements)

References 32 publications

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“…41 On resin-NH, the basic N-functionality with moderate strength could also show strong interaction with H 2 PtCl 6 during impregnation and act as the anchoring site for the hexachloroplatinic anion. 42,43 In addition, during the preparation process of Pt/resin-NH catalyst, part of -N(CH 3 ) 3 OH can exist as -N(CH 3 ) 3 + which may also interact with hexachloroplatinic anion, 38 favoring the Pt dispersion on the resin surface. This result is also in consistent with the previous nding that surface functionalization of the support could affect the Pt dispersion by strong metal-support interaction.…”

Section: Effect Of Surface Functional Group On Catalytic Performancementioning

confidence: 99%

“…2,3 However, the problems of H 2 delivery and storage remain as two major hurdles in developing large-scale H 2 -based energy technologies. Currently, chemical hydrides (e.g., sodium borohydride, NaBH 4 ) have great potential to resolve above problems thanks to their high gravimetric/ volumetric hydrogen storage capacities.…”

Section: Introductionmentioning

confidence: 99%

“…Various types of catalysts have been reported for this reaction. Besides acid (e.g., oxalic acid and citric acid), 6 metallic salts (e.g., RuCl 3 , RhCl 3 and PtCl 3 ), 10 metal borides (e.g., CoB and Ni x B) 11,12 and reduced transition metals (e.g., Co and Ru), [12][13][14] supported metal catalysts have attracted exclusive attention because the performance can be improved by the geometric effect (e.g. shape of metal) and/or the electronic effect (change in the electronic environment of metal 23 showed that the hydrophobicity and hydrophilicity of polymer support could tune the metal loading, and thus change the hydrogen production rate.…”

Section: Introductionmentioning

confidence: 99%

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Insights into the effect of surface functional groups on catalytic performance for hydrogen generation from sodium borohydride

et al. 2016

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Sodium borohydride hydrolysis to generate hydrogen has great potential for mobile and portable applications, and designing efficient catalysts for this reaction is indispensable. In this work, the effect of surface functional groups on hydrogen generation rate (HGR) is investigated using two polystyrene resin supported Pt catalysts. The first type of resin (resin-NH) contains -N(CH 3 ) 3 OH and abundant -OH groups, while the other one (resin-SH) contains -SO 3 H and less -OH. After excluding the influences of basicity and Pt loading, it is found that the Pt/resin-NH catalyst exhibits a much higher HGR and lower activation energy compared with the Pt/resin-SH catalyst. Moreover, multiple techniques such as FT-IR, XRD, TEM and XPS are further employed to elucidate the intrinsic mechanism. Compared with the -SO 3 H group, the -N(CH 3 ) 3 OH and -OH groups not only facilitate Pt dispersion by enhancing metalsupport interaction but also improve the electronic conductivity during hydrolysis by forming electronenriched Pt active sites.

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Section: Effect Of Surface Functional Group On Catalytic Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Insights into the effect of surface functional groups on catalytic performance for hydrogen generation from sodium borohydride

et al. 2016

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“…(2011) obtained a GHSC of 6.1 wt% using a similar setup in which alkali-free water was injected into a reactor containing solid NaBH 4 and Ni-Ru catalyst [86]. These results demonstrate the potential for new designs based on alternative reactor configurations.…”

Section: Catalytic Hydrolysis Of Nabh 4 Solutionsmentioning

confidence: 76%

“…The same group later reported that the activity reduced to 25% of its initial rate after 300 cycles, which was believed to be due to the disintegration of Ru from the catalyst after extended usage [86].…”

Section: Noble Metal Catalystsmentioning

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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About the Technological Readiness of the H₂ Generation by Hydrolysis of B(−N)−H Compounds

Demirci

2018

Energy Tech

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At the beginning of the new millennium, hydrolysis of sodium borohydride (NaBH4) was presented as a promising on‐board technology to generate H2 for light‐duty vehicles. Years later, other B(−N)−H compounds (e.g., lithium borohydride (LiBH4) and ammonia borane (NH3BH3)) emerged as attractive alternatives whereas NaBH4 was struggling with several issues jeopardizing its implementation. Actually, efforts in the research and development of H2 generation by hydrolysis of B(−N)−H compounds have been intensive since the advent of NaBH4 almost 20 years ago. There may be a question with respect to this: What is the technological readiness of the promising hydrolytic B(−N)−H compounds? This Review aims at providing relevant elements in response to this question. In the first part, the most mature B(−N)−H compounds are discussed at length. In the second part, a survey of all other candidates is proposed. It is concluded that NaBH4 is the best hydrolytic B(−N)−H compound for marketing on a broad scale, but there are still key challenges to address.

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Durability and reutilization capabilities of a Ni–Ru catalyst for the hydrolysis of sodium borohydride in batch reactors

Cited by 33 publications

References 32 publications

Insights into the effect of surface functional groups on catalytic performance for hydrogen generation from sodium borohydride

Insights into the effect of surface functional groups on catalytic performance for hydrogen generation from sodium borohydride

Sodium borohydride production and utilisation for improved hydrogen storage

About the Technological Readiness of the H₂ Generation by Hydrolysis of B(−N)−H Compounds

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Durability and reutilization capabilities of a Ni–Ru catalyst for the hydrolysis of sodium borohydride in batch reactors

Cited by 33 publications

References 32 publications

Insights into the effect of surface functional groups on catalytic performance for hydrogen generation from sodium borohydride

Insights into the effect of surface functional groups on catalytic performance for hydrogen generation from sodium borohydride

Sodium borohydride production and utilisation for improved hydrogen storage

About the Technological Readiness of the H2 Generation by Hydrolysis of B(−N)−H Compounds

Contact Info

Product

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About the Technological Readiness of the H₂ Generation by Hydrolysis of B(−N)−H Compounds