Environmental exposure of 2LiBH4+MgH2 using empirical and theoretical thermodynamics

James, Charles W.; Tamburello, David; Brinkman, Kyle S.; Gray, Joshua R.; Hardy, B.J.; Anton, Donald L.

doi:10.1016/j.ijhydene.2010.05.025

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…For these measurements, the calorimeter equipped with a flow cell utlilizing either argon or air as the carrier gas with a flow rate of 10 ml/min reacting with 5-10 mg of solid. [11,12]. Thermal Gravimetric Analysis (TGA) was utilized at various heating heats (0.8, 2, 5, and 10 o C/min) to determine the kinetics of ammonia borane, which was inputted into the modeling effort.…”

Section: Methodsmentioning

confidence: 99%

“…No water reaction was observed. Figure 2 displays the normalized heat flow (mW/mg) for the 2LiBH 4 :MgH 2 reaction with liquid water in a mixing cell compared with water vapor in a gas flow cell [8,11]. The amount of total water addition in excess of stoichiometry is 32 times for liquid water and 4 times (after a reaction time of 12 hours) for the conditions of 40 o C and 30% relative humidity.…”

Section: Un Derivative Testingmentioning

confidence: 99%

“…Thus, there is a critical radius between ¼ and ½ inch that indicates the minimum amount of material necessary for a hydrogen reaction event to occur. Note: *based on contamination model [8] Figure 2 shows the species concentration major components of the hydrogen-air reaction for the ½ inch sphere model. Note that as the H 2 and O 2 burn away, water vapor (H 2 O) increases in their place.…”

Section: Modelingmentioning

confidence: 99%

See 2 more Smart Citations

Environmental Reactivity of Solid State Hydride Materials: Modeling and Testing for Air and Water Exposure

Anton

James

Tamburello

et al. 2010

5th FORUM ON NEW MATERIALS PART A

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To make commercially acceptable condensed phase hydrogen storage systems, it is important to understand quantitatively the risks involved in using these materials. A rigorous set of environmental reactivity tests have been developed based on modified testing procedures codified by the United Nations for the transportation of dangerous goods. Potential hydrogen storage material, 2LiBH 4 •MgH 2 and NH 3 BH 3 , have been tested using these modified procedures to evaluate the relative risks of these materials coming in contact with the environment in hypothetical accident scenarios. It is apparent that an ignition event will only occur if both a flammable concentration of hydrogen and sufficient thermal energy were available to ignite the hydrogen gas mixture. In order to predict hydride behavior for hypothesized accident scenarios, an idealized finite element model was developed for dispersed hydride from a breached system. Empirical thermodynamic calculations based on precise calorimetric experiments were performed in order to quantify the energy and hydrogen release rates and to quantify the reaction products resulting from water and air exposure. Both thermal and compositional predictions were made with identification of potential ignition event scenarios.

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Section: Methodsmentioning

confidence: 99%

Section: Un Derivative Testingmentioning

confidence: 99%

Section: Modelingmentioning

confidence: 99%

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Environmental Reactivity of Solid State Hydride Materials: Modeling and Testing for Air and Water Exposure

Anton

James

Tamburello

et al. 2010

5th FORUM ON NEW MATERIALS PART A

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Fundamental environmental reactivity testing and analysis of the hydrogen storage material 2LiBH4·MgH2

James

Brinkman

Gray

et al. 2014

International Journal of Hydrogen Energy

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While the storage of hydrogen for portable and stationary applications is regarded as critical in bringing PEM fuel cells to commercial acceptance, little is known of the environmental exposure risks posed in utilizing condensed phase chemical storage options as in complex hydrides. It is thus important to understand the effect of environmental exposure of metal hydrides in the case of accident scenarios. Simulated tests were performed following the United Nations standards to test for flammability and water reactivity in air for a destabilized lithium borohydride and magnesium hydride system in a 2 to 1 molar ratio respectively. It was determined that the mixture acted similarly to the parent, lithium borohydride, but at slower rate of reaction seen in magnesium hydride. To quantify environmental exposure kinetics, isothermal calorimetry was utilized to measure the enthalpy of reaction as a function of exposure time to dry and humid air, and liquid water. The reaction with liquid water was found to increase the heat flow significantly during exposure compared to exposure in dry or humid air environments. Calorimetric results showed the maximum normalized heat flow the fully charged material was 6 mW/mg under liquid phase hydrolysis; and 14 mW/mg for the fully discharged material also occurring under liquid phase hydrolysis conditions.

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Hydrogen storage technologies for stationary and mobile applications: Review, analysis and perspectives

Hassan

Ramadan

Saleh

et al. 2021

Renewable and Sustainable Energy Reviews

496

166

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Environmental exposure of 2LiBH4+MgH2 using empirical and theoretical thermodynamics

Cited by 3 publications

References 8 publications

Environmental Reactivity of Solid State Hydride Materials: Modeling and Testing for Air and Water Exposure

Environmental Reactivity of Solid State Hydride Materials: Modeling and Testing for Air and Water Exposure

Fundamental environmental reactivity testing and analysis of the hydrogen storage material 2LiBH4·MgH2

Hydrogen storage technologies for stationary and mobile applications: Review, analysis and perspectives

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