Hydrogen generation by oxidation of coarse aluminum in low content alkali aqueous solution under intensive mixing

Ambaryan, Grayr N.; Vlaskin, Mikhail S.; Дудоладов, А. О.; Meshkov, E.A.; Жук, А. З.; Школьников, Е. И.

doi:10.1016/j.ijhydene.2016.08.005

Cited by 65 publications

(34 citation statements)

References 33 publications

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“…In oxidation experiments aluminium in the form of granules with aluminium content of not less than 99.99 % has been used (aluminium grade "A99") [8]. Experiments on the oxidation of aluminum were carried out in a pilot plant, those description is shown in [8].…”

Section: Methodsmentioning

confidence: 99%

“…Experiments on the oxidation of aluminum were carried out in a pilot plant, those description is shown in [8].…”

Section: Methodsmentioning

confidence: 99%

“…Recently, a method has been proposed for the oxidation of granular aluminum in low-percentage alkali solutions with vigorous stirring, in which the alkali acts as a catalyst for the oxidation process [8]. The producing aluminate under the specific experimental conditions quickly decomposed into aluminum hydroxide and alkali, which then participated in the oxidation of the next portion of aluminum.…”

Section: Introductionmentioning

confidence: 99%

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Technology for High Pure Aluminum Oxide Production from Aluminum Scrap

Ambaryan

Vlaskin

Школьников

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this study a simple ecologically benign technology of high purity alumina production is presented. The synthesis process consists of three steps) oxidation of aluminum in water at temperature of 90 °C) calcinations of Al hydroxide in atmosphere at 1100 °C) high temperature vacuum processing of aluminum alpha oxide at 1750 °C. Oxidation of aluminum scrap was carried out under intensive mixing in water with small addition of KOH as a catalyst. It was shown that under implemented experimental conditions alkali was continuously regenerated during oxidation reaction and synergistic effect of low content alkali aqueous solution and intensive mixing worked. The product of oxidation of aluminum scrap is the powder of Al(OH) 3 . Then it can be preliminary granulated or directly subjected to thermal treatment deleting the impurities from the product (aluminum oxide). It was shown the possibility to produce the high-purity aluminum oxide of 5N grade (99.999 %). Aluminum oxide, synthesized by means of the proposed method, meets the requirements of industrial manufacturers of synthetic sapphire (aluminum oxide monocrystals). Obtained high pure aluminum oxide can be also used for the manufacture of implants, artificial joints, microscalpels, high-purity ceramics and other refractory shapes for manufacture of ultra-pure products.

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Section: Methodsmentioning

confidence: 99%

“…Experiments on the oxidation of aluminum were carried out in a pilot plant, those description is shown in [8].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Technology for High Pure Aluminum Oxide Production from Aluminum Scrap

Ambaryan

Vlaskin

Школьников

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Hydrogen productionf rom the hydrolysis of active metals, such as Mg and Al, hasa ttracted much attention because of their abundance and nontoxicity. [65][66][67][68][69][70] Although Mg has al ow H 2 storage density (3.3 wt %) in water comparedt ot hat of Al (3.7 wt %), it is capable of generating hydrogen in an eutral aqueous solutioni nstead of the alkaline solutiont hat is requiredf or the hydrolysis of Al. [71][72][73][74] The Mg alloy can be fully recycled by electrical system with the efficiency of 41 %.…”

Section: Hydrolysis Of Metals In Seawatermentioning

confidence: 99%

Fuel Production from Seawater and Fuel Cells Using Seawater

2017

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Seawater is the most abundant resource on our planet and fuel production from seawater has the notable advantage that it would not compete with growing demands for pure water. This Review focuses on the production of fuels from seawater and their direct use in fuel cells. Electrolysis of seawater under appropriate conditions affords hydrogen and dioxygen with 100 % faradaic efficiency without oxidation of chloride. Photoelectrocatalytic production of hydrogen from seawater provides a promising way to produce hydrogen with low cost and high efficiency. Microbial solar cells (MSCs) that use biofilms produced in seawater can generate electricity from sunlight without additional fuel because the products of photosynthesis can be utilized as electrode reactants, whereas the electrode products can be utilized as photosynthetic reactants. Another important source for hydrogen is hydrogen sulfide, which is abundantly found in Black Sea deep water. Hydrogen produced by electrolysis of Black Sea deep water can also be used in hydrogen fuel cells. Production of a fuel and its direct use in a fuel cell has been made possible for the first time by a combination of photocatalytic production of hydrogen peroxide from seawater and dioxygen in the air and its direct use in one‐compartment hydrogen peroxide fuel cells to obtain electric power.

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“…The major obstacle for producing hydrogen by Al-H 2 O reaction is that a dense oxide layer on the Al surface which can stop the reaction of Al-H 2 O. To break down the oxide layer, Al reacting directly with alkaline solution was a simple method [16][17][18] . But alkaline solutions were easy to corrode equipment.…”

Section: Introductionmentioning

confidence: 99%