Studies on microstructure of activated aluminum and its hydrogen generation properties in aluminum/water reaction

Ilyukhina, A.V.; Kravchenko, O. V.; Булычев, Б. М.

doi:10.1016/j.jallcom.2016.08.151

Cited by 83 publications

(29 citation statements)

References 47 publications

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“…But the cost of this method is significantly increased due to the addition of these particular precious metals. Another way is using hydroxide ions (OH − ) in alkaline solutions to etch the Al 2 O 3 surface during the H 2 production . The aluminum oxide layer is passive in the neutral solution, but it can be dissolved in the alkaline solution by the chemical reaction between OH − and Al 2 O 3 with the following reaction .…”

Section: Introductionmentioning

confidence: 99%

“…Another way is using hydroxide ions (OH − ) in alkaline solutions to etch the Al 2 O 3 surface during the H 2 production. 15,16,[24][25][26] The aluminum oxide layer is passive in the neutral solution, but it can be dissolved in the alkaline solution by the chemical reaction between OH − and Al 2 O 3 with the following reaction. 11 The formed Al (OH) 4 − is readily dissolved in alkaline solution and allows the aluminum-water reaction to proceed continuously and release large amounts of hydrogen.…”

Section: Introductionmentioning

confidence: 99%

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Highly efficient hydrolysis of magnetic milled powder from waste aluminum (Al) cans with low‐concentrated alkaline solution for hydrogen generation

et al. 2019

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Summary Currently, recycling waste aluminum materials are of significant importance for reducing environmental pollution and improving economic efficiency. In this paper, aluminum (Al) powder prepared from waste Al cans with magnetic grinding method was directly used in hydrolysis for hydrogen generation. The prepared waste Al cans powder was characterized by scanning electron microscope (SEM), X‐ray diffraction (XRD), Brunauer–Emmett–Teller (BET), atomic absorption spectrophotometer (AAS), and density analysis. The results showed that grinding time, NaOH concentration, and reaction temperature affected the hydrolysis rate and hydrogen yield markedly; 1 g of Al cans powder with grinding time of 40 minutes could produce 1296‐mL hydrogen within 6 minutes under the optimal reaction conditions. The reaction kinetics study demonstrated that the hydrolysis of Al cans powder is kinetically controlled while hydrolysis of Al cans flakes is diffusively controlled. The hydrolysis mechanism was also predicted based on the experimental results and kinetic study. The generation of hydrogen from hydrolysis of waste Al cans powder with low‐concentrated alkaline solution is a promising way to diminish environmental pollution and instrument corrosion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly efficient hydrolysis of magnetic milled powder from waste aluminum (Al) cans with low‐concentrated alkaline solution for hydrogen generation

et al. 2019

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“…The hydrolysis byproduct Al (OH) 3 can be directly used for water treatment, papermaking, or produce the recycled Al, which can be reused for the hydrolysis reaction without any loss of quality. Al can produce H 2 directly in water by the following reaction (Equation ), and Al (OH) 3 is the most stable product at temperature of 20°C to 280°C:

2Al + {6H}_{2} normalO \to 2Al {(OH)}_{3} + {3H}_{2} .

…”

Section: Introductionmentioning

confidence: 99%

Insight into the effect of In addition on hydrogen generation behavior and hydrolysis mechanism of Al‐based ternary alloys in distilled water—A new active Al‐Ga‐In hydrolysis hydrogen generation alloy

Liu

Jin

et al. 2019

Int J Energy Res

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Al2Ga)-xIn (x = 0, 2, 4, 6, 8 wt%) ternary aluminum (Al) alloys with different weight ratio of In for hydrolysis H 2 generation were prepared by meltingcasting technique. The phase compositions and microstructures of Al-rich alloys were investigated by X-ray diffraction (XRD) and high resolution scanning electron microscope (HR-SEM) equipped with an energy dispersive spectrometer (EDS). The effect of In addition ratio on microstructures and H 2 generation performance were investigated, and the hydrolysis mechanism for Al-Ga-In ternary Al-based alloys has been proposed. Al phase as matrix phase in the Al-Ga-In ternary alloy mainly determines the hydrolysis behavior, and the second phase In strongly promotes the hydrolysis process. The increase of In content can accelerate the H 2 generation rate as well as the final capacity and generation yield in neutral water. The generation yields for (Al2Ga)-x In (x = 2, 4, 6, 8 wt%) alloys at 50°C are 0.56, 0.59, 0.62, and 0.66, respectively. The raising hydrolysis temperature can elevate the initial hydrolysis rate, final H 2 generation capacity, and yield. The H 2 generation capacities of (Al2Ga)-8In alloy at 50°C, 60°C, and 70°C are 262, 290, and 779 mL·g −1 , respectively.

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“…Generally, the mechanism of hydrogen production through Al and its alloys has been previously reviewed by Wang [11]. Specifically, many published original studies were accomplished by experimental characterizations and tests [12][13][14][15][16][17], while some other investigations were based on numerical simulations [18][19][20]. Furthermore, another conventional application is in the field of energetic materials, as pure Al shows excellent reaction and explosion properties while being exposed in atmosphere [21].…”

Section: Introductionmentioning

confidence: 99%

Corrosion and Magnetization Analyses of Iron Encapsulated Aluminum Particles by Numerical Simulations

Guo

Sun

et al. 2019

Coatings

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In this study, the effects of corrosion and magnetization on iron (Fe) encapsulated aluminum (Al) particles were uncovered through the assistance of molecular dynamic (MD) simulations and finite element analysis (FEA). The corrosion of metal particles with two phases was designed to be surrounded by O 2 or H 2 O molecules. Next, the magnetization was simulated to be under a constant magnetic field. According to the obtained results, a portion of O 2 molecules did not react with Fe atoms. They were actually adsorbed on the particle surface and the adsorption eventually reached a saturated state. However, the saturated effect did not appear to be due to the oxidation behavior of other O 2 molecules. Both oxidation and adsorption effects released pressure on Fe atoms and caused different extents of displacements. Next, a similar saturated effect was also observed for adsorbed H 2 O molecules. At the same time, other reacted H 2 O molecules produced a significant amount of OH − and caused charge transfer from Fe atoms. Additionally, the geometrical distribution of particles' magnetic flux density and magnetization intensity were also studied.

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Studies on microstructure of activated aluminum and its hydrogen generation properties in aluminum/water reaction

Cited by 83 publications

References 47 publications

Highly efficient hydrolysis of magnetic milled powder from waste aluminum (Al) cans with low‐concentrated alkaline solution for hydrogen generation

Highly efficient hydrolysis of magnetic milled powder from waste aluminum (Al) cans with low‐concentrated alkaline solution for hydrogen generation

Insight into the effect of In addition on hydrogen generation behavior and hydrolysis mechanism of Al‐based ternary alloys in distilled water—A new active Al‐Ga‐In hydrolysis hydrogen generation alloy

Corrosion and Magnetization Analyses of Iron Encapsulated Aluminum Particles by Numerical Simulations

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