Hydrogen Generation from Chemical Hydrides

Marrero-Alfonso, Eyma Y.; Beaird, Amy M.; Davis, Thomas A.; Matthews, Michael A.

doi:10.1021/ie8016225

Cited by 143 publications

(78 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is typical of the presence, in equilibrium, of the base tetrahydroxyborate anion B(OH)4 − and the acid counterpart boric acid B(OH)3 [39]. Furthermore, in the hydrolysis conditions, the anhydrous borate anion BO2 − cannot exist, the hydrated form B(OH)4 − being the thermodynamically stable phase [40]. Consequently, the hydrolysis more likely takes place according to the reactions described by Equation (8) ) and Equation (9) (∆rH = −208.7 kJ·mol…”

Section: Hydrolysis Of the Bh3 Group Of Hydrazine Boranementioning

confidence: 99%

Hydrazine Borane and Hydrazinidoboranes as Chemical Hydrogen Storage Materials

Moury

Demirci

2015

Energies

View full text Add to dashboard Cite

Abstract:Hydrazine borane N2H4BH3 and alkali derivatives (i.e., lithium, sodium and potassium hydrazinidoboranes MN2H3BH3 with M = Li, Na and K) have been considered as potential chemical hydrogen storage materials. They belong to the family of boron-and nitrogen-based materials and the present article aims at providing a timely review while focusing on fundamentals so that their effective potential in the field could be appreciated. It stands out that, on the one hand, hydrazine borane, in aqueous solution, would be suitable for full dehydrogenation in hydrolytic conditions; the most attractive feature is the possibility to dehydrogenate, in addition to the BH3 group, the N2H4 moiety in the presence of an active and selective metal-based catalyst but for which further improvements are still necessary. However, the thermolytic dehydrogenation of hydrazine borane should be avoided because of the evolution of significant amounts of hydrazine and the formation of a shock-sensitive solid residue upon heating at >300 °C. On the other hand, the alkali hydrazinidoboranes, obtained by reaction of hydrazine borane with alkali hydrides, would be more suitable to thermolytic dehydrogenation, with improved properties in comparison to the parent borane. All of these aspects are surveyed herein and put into perspective.

show abstract

Section: Hydrolysis Of the Bh3 Group Of Hydrazine Boranementioning

confidence: 99%

Hydrazine Borane and Hydrazinidoboranes as Chemical Hydrogen Storage Materials

Moury

Demirci

2015

Energies

View full text Add to dashboard Cite

show abstract

“…However, the anhydrous metaborate, BO 2 À or NH 4 BO 2 , is not the thermodynamically stable form found under the reaction conditions (temperatures up to approximately 100 8C and atmospheric pressure). [50] To illustrate this, one may refer to literature dedicated to the hydrolysis of SB as both reactions are very similar. SB was introduced in the late 1990s as a promising storage material for vehicular applications owing to its material-based absolute GHSC of 10.8 wt %.…”

Section: Hydrolysis Of Sodium Borohydridementioning

confidence: 99%

“…[50] However, upon drying at < 110 8C, the species present are primarily NaBO 2 ·2 H 2 O and NaBO 2 ·4 H 2 O. [53] The formation of Na 2 B 4 O 7 ·5 H 2 O has also been reported.…”

Section: Borates In Hydrolysis Of Sodium Borohydridementioning

confidence: 99%

Hydrolysis of Ammonia Borane as a Hydrogen Source: Fundamental Issues and Potential Solutions Towards Implementation

et al. 2011

View full text Add to dashboard Cite

In today's era of energy crisis and global warming, hydrogen has been projected as a sustainable alternative to depleting CO(2)-emitting fossil fuels. However, its deployment as an energy source is impeded by many issues, one of the most important being storage. Chemical hydrogen storage materials, in particular B-N compounds such as ammonia borane, with a potential storage capacity of 19.6 wt % H(2) and 0.145 kg(H2)L(-1), have been intensively studied from the standpoint of addressing the storage issues. Ammonia borane undergoes dehydrogenation through hydrolysis at room temperature in the presence of a catalyst, but its practical implementation is hindered by several problems affecting all of the chemical compounds in the reaction scheme, including ammonia borane, water, borate byproducts, and hydrogen. In this Minireview, we exhaustively survey the state of the art, discuss the fundamental problems, and, where applicable, propose solutions with the prospect of technological applications.

show abstract

“…All of these approaches lead to materials designed to be mixed with sand, as PRBs have been traditionally constructed, offering no solution to prevent pore clogging and decreasing hydraulic conductivity caused by soil illuviation. Production of reactive media reported in most of these studies employed borohydride reduction that is also costly, 12 energy-intensive, and offers no way to reduce the climate impact of ZVI production. 13 Pyrolysis of biomass pretreated with iron salts has been demonstrated to produce ZVI.…”

Section: ■ Introductionmentioning

confidence: 99%

Macroporous Carbon Supported Zerovalent Iron for Remediation of Trichloroethylene

Lawrinenko

Wang

Horton

et al. 2017

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Groundwater contamination with chlorinated hydrocarbons has become a widespread problem that threatens water quality and human health. Permeable reactive barriers (PRBs), which employ zerovalent iron, are effective for remediation; however, a need exists to reduce the economic and environmental costs associated with constructing PRBs. We present a method to produce zerovalent iron supported on macroporous carbon using only lignin and magnetite. Biochar-ZVI (BC-ZVI) produced by this method exhibits a broad pore size distribution with micrometer sized ZVI phases dispersed throughout a carbon matrix. X-ray diffraction revealed that pyrolysis at 900 °C of a 50/50 lignin–magnetite mixture resulted in almost complete reduction of magnetite to ZVI and that compression molding promotes iron reduction in pyrolysis due to mixing of starting materials. High temperature pyrolysis of lignin yields some graphite in BC-ZVI due to reduction of carbonaceous gases on iron oxides. TCE was removed from water as it passed through a column packed with BC-ZVI at flow rates representative of average and high groundwater flow. One-dimensional convection–dispersion modeling revealed that adsorption by biochar influences TCE transport and that BC-ZVI facilitated removal of TCE from contaminated water by both adsorption and degradation.

show abstract

Hydrogen Generation from Chemical Hydrides

Cited by 143 publications

References 86 publications

Hydrazine Borane and Hydrazinidoboranes as Chemical Hydrogen Storage Materials

Hydrazine Borane and Hydrazinidoboranes as Chemical Hydrogen Storage Materials

Hydrolysis of Ammonia Borane as a Hydrogen Source: Fundamental Issues and Potential Solutions Towards Implementation

Macroporous Carbon Supported Zerovalent Iron for Remediation of Trichloroethylene

Contact Info

Product

Resources

About