Modeling hydrolysis kinetics of dual phase α-Mg/LPSO alloys

Legrée, M.; Bobet, Jean‐Louis; Mauvy, Fabrice; Sabatier, Jocelyn

doi:10.1016/j.ijhydene.2022.05.001

Cited by 5 publications

(5 citation statements)

References 53 publications

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“…Along with various methods of reversible hydrogen storage based on physical processes (compression, liquefaction) and the use of hydrogen storage materials (high-surface area adsorbents, hydrides, liquid organic hydrogen carriers, etc.) [6], special attention has been recently paid to on-site (or on-board) hydrogen generation by the hydrolysis of various lightweight materials like ammonia borane [7], sodium borohydride [8], aluminium [9], magnesium and magnesium alloys [10][11][12][13][14][15], magnesium hydride [11,[16][17][18][19], and so on. These materials can undergo hydrolysis at near-ambient conditions, in alkaline, acidic, or neutral medium, frequently, at presence of a catalyst.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Generation by Hydrolysis of Magnesium Hydride in Organic Acids Solutions

Lototskyy

Davids

Sekgobela

et al. 2023

Preprint

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Hydrolysis of MgH2 has a high theoretical hydrogen yield (15.2%) and is very attractive for onsite hydrogen production. However, the low solubility of Mg(OH)2 causes sluggish kinetics and incomplete utilization of MgH2. In this paper, we solve this problem by using organic acids (acetic, citric and oxalic) and nanoscale graphene-like carbon. The organic acid solution significantly increases the yield and rate of H2 generation due to its acidic nature. The hydrogen yield approaches 100% with a fast hydrolysis rate when the molar ratio Acid/MgH2 exceeds 0.9, 2.0 and 2.7 for the citric, oxalic and acetic acid, respectively. In doing so, pH of the reaction solutions after hydrolysis corresponds to 4.53, 2.11 and 4.28, accordingly, testifying about buffer nature of the solutions “citric acid / magnesium citrate” and “acetic acid / magnesium acetate”. The addition of graphene-like material (GLM) also significantly increases the yield and rate of H2 generation due to the decrease of particle size and increase of defects in the material, as well as due to stabilising the MgH2 nanoparticles and preventing their agglomeration. Additionally, GLM encapsulates the MgH2 particles thus suppressing the formation of MgO and, in turn, promoting achievement of the maximum hydrogen yield. In addition, this work presents layout and operation features of the developed apparatus for the controlled generation of pressurised hydrogen using hydrolysis of Mg or MgH2 in acidic solutions, as well as its testing results for the hydrolysis of Mg and MgH2 in the solution of citric acid.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Generation by Hydrolysis of Magnesium Hydride in Organic Acids Solutions

Lototskyy

Davids

Sekgobela

et al. 2023

Preprint

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“…Hydrolysis reactions were performed in a closed 100 mL three-neck, round bottom flask connected to a burette that dips in a beaker of tap water. This setup is described in detail in a previous paper [26]. The production of H 2 during the experiment induces water displacement back to the beaker, and a balance connected to a computer records the mass variation.…”

Section: Hydrolysismentioning

confidence: 99%

“…Therefore, the hydrolysis reaction of Al (covered with Al 2 O 3 ) is often performed in basic solutions (pH close to 14) to avoid the domain of stability of the Al 2 O 3 surface layer [38]. The hydrolysis of the Mg is possible in pure water but is often studied in simulated seawater [6,25,26] to increase the reaction kinetics. As demonstrated by our first results, the addition of Mg to Al (20 wt.% in this study) allows for the activation of the hydrolysis reaction of Al in simulated seawater and therefore improves H 2 production.…”

Section: Hydrogen Productionmentioning

confidence: 99%

“…However, all these production techniques are limited by economic, environmental, and resource constraints (especially production from biomass). H 2 production has already been extensively studied using Mg, Mg alloys, and Al [6,[25][26][27][28]. The hydrolysis reaction (i.e., oxido-reduction reaction) of 1 mole of Al (Equation ( 1)) could generate 1.5 times more H 2 than 1 mole of Mg (Equation ( 2)) because of the number of valence electrons (3 for Al and 2 for Mg).…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Production Properties of Aluminum–Magnesium Alloy Presenting β-Phase Al3Mg2

Cuzacq,

Polido,

Silvain

et al. 2023

Metals

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In this study, aluminum–magnesium (Al-Mg) bulk porous materials were fabricated by using uniaxial hot pressing to control the porosity rate of the material over a wide range (up to 50%). The fabricated materials were analyzed by X-ray diffraction and scanning electron microscopy. The results demonstrated the appearance of intermetallic (IM) phase Al3Mg2, and its quantity increased with the applied pressure. In the context of the decline of global fossil fuel reserves, the revalorization of these materials by hydrogen (H2) production was investigated. Hydrolysis of the Al-Mg materials was carried out in a simulated seawater solution (aqueous solution of sodium chloride 35 g/L). The results showed the role of the porosity rate in the H2 production properties of the fabricated materials; the increase of porosity rate from 10% to 50% cuts the reaction time in half. Finally, the role of IM phase Al3Mg2 in H2 production was highlighted through galvanic coupling.

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“…Along with various methods of reversible hydrogen storage based on physical processes (compression and liquefaction) and the use of hydrogen storage materials (high-surface area adsorbents, hydrides, liquid organic hydrogen carriers, etc.) [5], special attention has been recently paid to on-site (or on-board) hydrogen generation by the hydrolysis of various light-weight materials such as ammonia borane [6,7], sodium, lithium and magnesium borohydrides [8][9][10][11], aluminium [9,12] or alloys/composites on its basis [13], magnesium and magnesium alloys [9,[14][15][16][17][18], magnesium hydride [9,15,[19][20][21][22][23], and so on. These materials can undergo hydrolysis at near-ambient conditions, in alkaline, acidic, or neutral media, and frequently in the presence of a catalyst.…”

Section: Introductionmentioning

confidence: 99%

Tailoring of Hydrogen Generation by Hydrolysis of Magnesium Hydride in Organic Acids Solutions and Development of Generator of the Pressurised H2 Based on this Process

et al. 2023

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Hydrolysis of light metals and hydrides can potentially be used for the generation of hydrogen on-board fuel cell vehicles, or, alternatively, for refilling their fuel tanks with H2 generated and pressurised without compressor on site, at near-ambient conditions. Implementation of this approach requires solution of several problems, including the possibility of controlling H2 release and avoiding thermal runaway. We have solved this problem by developing the apparatus for the controlled generation of pressurised H2 using hydrolysis of Mg or MgH2 in organic acid solutions. The development is based on the results of experimental studies of MgH2 hydrolysis in dilute aqueous solutions of acetic, citric, and oxalic acids. It was shown that the hydrogen yield approaches 100% with a fast hydrolysis rate when the molar ratio acid/MgH2 exceeds 0.9, 2.0, and 2.7 for the citric, oxalic, and acetic acids, respectively. In doing so, the pH of the reaction solutions after hydrolysis corresponds to 4.53, 2.11, and 4.28, accordingly, testifying to the buffer nature of the solutions “citric acid/magnesium citrate” and “acetic acid/magnesium acetate”. We also overview testing results of the developed apparatus where the process rate is effectively controlled by the control of the acid concentration in the hydrolysis reactor.

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Modeling hydrolysis kinetics of dual phase α-Mg/LPSO alloys

Cited by 5 publications

References 53 publications

Hydrogen Generation by Hydrolysis of Magnesium Hydride in Organic Acids Solutions

Hydrogen Generation by Hydrolysis of Magnesium Hydride in Organic Acids Solutions

Hydrogen Production Properties of Aluminum–Magnesium Alloy Presenting β-Phase Al3Mg2

Tailoring of Hydrogen Generation by Hydrolysis of Magnesium Hydride in Organic Acids Solutions and Development of Generator of the Pressurised H2 Based on this Process

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