A novel method for generating hydrogen by hydrolysis of highly activated aluminum nanoparticles in pure water

Alinejad, Babak; Mahmoodi, Korosh

doi:10.1016/j.ijhydene.2009.07.028

Cited by 207 publications

(83 citation statements)

References 12 publications

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“…Additives such as aluminum hydroxide [3], sodium stannate in sodium hydroxide solution [4], [5], hot water [6], CaO [7] were reported to be effective for enhanced generation of hydrogen, where serious corrosive conditions can be avoided. Alloying method such as Al-Ga alloys [8], [9], Bi doping [10], or milling additives such as SnCl 2 [10] or KCl/NaCl [11], and activated treatment on Al powders [12]- [14] are also employed to enhance the generation of hydrogen. However, these methods, accompanying with potential pollution, high cost and additional energy supply, are not very attractive.…”

Section: Introductionmentioning

confidence: 99%

Rapid Hydrogen Generation from Aluminum-Water System Using Synthesized Aluminum Hydroxide Catalyst

Wang¹,

Chin²

2015

IJCEA

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Abstract-Catalytic effect of Al(OH) 3 on the hydrogen generation from Al/water system is evaluated. The Al(OH) 3 powders are synthesized from various molar ratios of Al(NO 3 ) 3 : NaOH = 1:3 ~ 1:5. It was found that the Al(OH) 3 catalyst derived from the ratio Al(NO 3 ) 3 : NaOH = 1:3.5~1:4 in an ice bath exhibits the best catalytic effect and exerts the highest hydrogen generation rate. Over 95% yield of hydrogen from a 3 g Al/50 ml water system (with 15 g Al(OH) 3 and pH=12) can be generated within 100 s. That is, by using specially synthesized Al(OH) 3 catalyst at a Al:Al(OH) 3 :H 2 O=3:15:50 weight ratio, very rapid hydrogen generation rate (~667 ml/gAlmin), without using any alloying elements or extreme corrosive condition, can be realized.Index Terms-Aluminum hydroxide, aluminum nitrate, hydrogen generation.

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Section: Introductionmentioning

confidence: 99%

Rapid Hydrogen Generation from Aluminum-Water System Using Synthesized Aluminum Hydroxide Catalyst

Wang¹,

Chin²

2015

IJCEA

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“…As a result, the fresh Al surfaces will be exposed to water and the hydrolysis proceeding is promoted. 19) Combined with the promotion role of CaO additives, the higher hydrolysis activity of AlCaONaCl composites is obtained compared with that of AlCaO and AlNaCl materials.…”

Section: Effect Of Nacl Salt Additivementioning

confidence: 98%

“…The hydrolysis products are mainly composed of AlO(OH), which has been discussed in literature. 19) On the other hand, CaO additives in composites are also dissolved in water environment during hydrolysis reaction as follows:…”

Section: Proposed Mechanismmentioning

confidence: 99%

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Preparation and Hydrolysis of Aluminum Based Composites for Hydrogen Production in Pure Water

Wang

Dong

et al. 2014

Mater. Trans.

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A series of Al based composites were prepared using mechanical milling method in this paper. Effects of additives including CaO, NaCl salt and low melting point metals (Ga, In, and Sn) on the hydrolysis activity of Al based composites were evaluated in pure water. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were used for the microstructure analysis of as-prepared samples and their hydrolysis products. The results showed that the addition of CaO, NaCl salt and low melting point metals can effectively improve the hydrolysis properties of Al based composites. Especially, Al alloys-CaONaCl composites exhibited a higher hydrogen yields than AlCaO and AlCaO NaCl materials. The SEM images displayed that NaCl salt particles were homogeneously distributed on the surface of Al based composites and inserted into Al matrix, which may damage the surface oxide layer of Al. Furthermore, the size of NaCl salt particles was much smaller in Al alloys-CaONaCl composites than that in AlCaONaCl composites. The XRD patterns identified that the hydrolysis products were mainly composed of AlO(OH) and Al(OH) 3 . The microstructure-related hydrolysis reaction mechanism of Al based composites was proposed finally.

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“…are very active when they come in contact with water, react spontaneously, generating hydrogen and heat. Based on this chemical property, the hydrolysis reaction of pure aluminum powder is commonly used for high purity hydrogen generation [6,11,12,13,14].Although the use of pure aluminum in reaction with water to produce hydrogen is a viable method, it is expensive, if it takes into account the cost of producing pure aluminum and the use of an alkali metal hydroxide, also an expensive product. The alkali metal hydroxide is used to remove the protective layer of aluminum oxide on the surface of the aluminum particles, which prevent the contact between the metal and water, and thus slow down or substantially avoid reaction between the aluminum and water [15,16,17,18] .As a result, other methods should be studied and utilized to activate the surface of the aluminum particles, to initiate and accelerate the reaction of hydrolysis.…”

Section: Introductionmentioning

confidence: 99%

Process and Device for Generating High Purity Hydrogen Based on Hydrolysis Reaction of Aluminum Dross

David¹,

Kopač²

2017

Engineering Journal

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A novel method for generating hydrogen by hydrolysis of highly activated aluminum nanoparticles in pure water

Cited by 207 publications

References 12 publications

Rapid Hydrogen Generation from Aluminum-Water System Using Synthesized Aluminum Hydroxide Catalyst

Rapid Hydrogen Generation from Aluminum-Water System Using Synthesized Aluminum Hydroxide Catalyst

Preparation and Hydrolysis of Aluminum Based Composites for Hydrogen Production in Pure Water

Process and Device for Generating High Purity Hydrogen Based on Hydrolysis Reaction of Aluminum Dross

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