Mechanistic studies of combustion-stimulated hydrogen generation from sodium borohydride

Diakov, Victor; Diwan, Moiz; Shafirovich, Evgeny; Varma, Arvind

doi:10.1016/j.ces.2006.12.006

Cited by 25 publications

(6 citation statements)

References 15 publications

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“…The temperatures required for this process are in excess of 1000 °C and performed best with nanoscale metal powders. One of the main byproducts of this pathway is methane . Therefore, condensation of the unwanted gaseous products is required to purify the H 2 upstream of the fuel cell.…”

Section: Other Pathways For Utilizing Chemical Hydridesmentioning

confidence: 99%

“…One of the main byproducts of this pathway is methane. 39 Therefore, condensation of the unwanted gaseous products is required to purify the H 2 upstream of the fuel cell. Rather than generating hydrogen and then consuming it in a fuel cell or ICE, sodium borohydride can also be oxidized directly in the so-called direct borohydride fuel cell (DBFC).…”

Section: Other Pathways For Utilizing Chemical Hydridesmentioning

confidence: 99%

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Hydrogen Generation from Chemical Hydrides

Marrero-Alfonso

Beaird

Davis

et al. 2009

Ind. Eng. Chem. Res.

143

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Complex chemical hydrides can be used to store and deliver hydrogen gas to fuel cells, and thus are one of several candidate materials to be used in storage systems for the hydrogen economy. These hydrides have high native hydrogen content, and hydrogen can be released via several chemical pathways. This review summarizes the extensive literature on the kinetic and thermodynamic properties of the various reactions of chemical hydrides, with an emphasis on hydrolysis. These properties are significant because they affect all aspects of system design, as well as the recovery and recycle of the byproducts. Hydrolysis of chemical hydrides takes place at relatively low temperatures and gives promising theoretical hydrogen storage efficiencies. Complications include metastable kinetic pathways as well as inefficient utilization of water in the byproducts.

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Section: Other Pathways For Utilizing Chemical Hydridesmentioning

confidence: 99%

Section: Other Pathways For Utilizing Chemical Hydridesmentioning

confidence: 99%

Hydrogen Generation from Chemical Hydrides

Marrero-Alfonso

Beaird

Davis

et al. 2009

Ind. Eng. Chem. Res.

143

View full text Add to dashboard Cite

show abstract

“…Hydrogen is a well-known ideal energy carrier, and its safe and efficient storage as well as facile release is the key toward a hydrogen economy (Moussa et al, 2013;Turner, 2004;Diwan et al, 2011;Diakov et al, 2007;Demirkan et al, 2019;Sogut et al, 2019;Sen et al, 2018). With high hydrogen content (19.6 wt%), long-term stability, and nontoxicity at room temperature, ammonia borane (NH 3 BH 3 , AB) has been regarded as a promising hydrogen storage material (Yan et al, 2008;Valero-Pedraza et al, 2019;Yao et al, 2016;Li et al, 2017;Metin et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Synergistic Pt-WO3 Dual Active Sites to Boost Hydrogen Production from Ammonia Borane

Chen

Qian

et al. 2020

iScience

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Development of synergistic heterogeneous catalysts with active sites working cooperatively has been a pursuit of chemists. Herein, we report for the first time the fabrication and manipulation of Pt-WO 3 dual-active-sites to boost hydrogen generation from ammonia borane. A combination of DFT calculations, structural characterization, and kinetic (isotopic) analysis reveals that Pt and WO 3 act as the active sites for ammonia borane and H 2 O activation, respectively. A trade-off between the promoting effect of WO 3 and the negative effect of decreased Pt binding energy contributes to a volcano-shaped activity, and Pt/CNT-5W delivers a 4-fold increased activity of 710.1 mol H2 $mol Pt À1 $min À1 . Moreover, WO 3 is suggested to simultaneously act as the sacrificial site that can divert B-containing by-products away from Pt sites against deactivation, yielding an increase from 24% to 68% of the initial activity after five cycles. The strategy demonstrated here could shed a new light on the design and manipulation of dual-active-site catalysts.

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“…Polymers, thickening agents play an important role in Al/H 2 O combustion. For example, the addition of polyacrylamide (PAM) to the Al/H 2 O mixture can increase combustion stability and make the mixture ignite easily. , In addition, the addition of PAM to the Al/H 2 O mixture can inhibit water evaporation during combustion. − It can be found that many studies concentrate on the PAM thickening agent. Few fundamental combustion studies have been conducted on the effect of polyoxyethylene (PEO) thickening agent on combustion characteristics of the Al/H 2 O mixture.…”

Section: Introductionmentioning

confidence: 99%

Combustion Characteristics of an Al/H₂O Mixture with Polyoxyethylene

Zhu

2011

Ind. Eng. Chem. Res.

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An experimental investigation of the combustion characteristics of an aluminum/water (Al/H 2 O) mixture with the addition of polyoxyethylene (PEO) was conducted in argon at 0.1 MPa. The burning rates were obtained using a constant-pressure strand burner. Ignition and combustion processes of an Al/H 2 O mixture were observed with a high-speed camera. The results show that PEO addition can improve the ignition and combustion performance of an Al/H 2 O mixture. The mixture of nanosized Al powder and H 2 O cannot be ignited in argon at 0.1 MPa, but the mixture of nanosized Al powder and H 2 O with the mass fraction 1% PEO or 3% PEO can be ignited, and the mixture can be self-sustaining combustion. The burning rates are 2.57 mm/s and 3.94 mm/s, respectively. In the mixture of nanosized Al powder and H 2 O with 3% PEO, the ignition can be sustained when 20% nanosized Al powder is replaced by micrometer-sized Al powder, and the burning rate is 3.36 mm/s. However, the mixture would not be ignited when 25% nanosized Al powder is replaced by micrometer-sized Al powder. In addition, the combustion process and flame image characteristics were obtained by using a high-speed photography technique, and the condensed combustion products were characterized by scanning electron microscopy combined with energy dispersive X-ray.

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Mechanistic studies of combustion-stimulated hydrogen generation from sodium borohydride

Cited by 25 publications

References 15 publications

Hydrogen Generation from Chemical Hydrides

Hydrogen Generation from Chemical Hydrides

Synergistic Pt-WO3 Dual Active Sites to Boost Hydrogen Production from Ammonia Borane

Combustion Characteristics of an Al/H₂O Mixture with Polyoxyethylene

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Mechanistic studies of combustion-stimulated hydrogen generation from sodium borohydride

Cited by 25 publications

References 15 publications

Hydrogen Generation from Chemical Hydrides

Hydrogen Generation from Chemical Hydrides

Synergistic Pt-WO3 Dual Active Sites to Boost Hydrogen Production from Ammonia Borane

Combustion Characteristics of an Al/H2O Mixture with Polyoxyethylene

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Combustion Characteristics of an Al/H₂O Mixture with Polyoxyethylene