Effect of initial gas pressure on the reaction of Al with water

Gai, Wei‐Zhuo; Deng, Zhen‐Yan

doi:10.1016/j.ijhydene.2014.02.087

Cited by 28 publications

(19 citation statements)

References 33 publications

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“…39 Another was prepared by putting pure Al powder into a beaker with deionized water, then ultrasonically treating in an ultrasonic vessel (40 kHz, 100 W) at 40 C for a time period ($2 h) to form Al(OH) 3 suspension (S-UAH), and nally ltering by a lter paper and drying at 60 C to form Al(OH) 3 powder (UAH). One was prepared by reacting pure Al powder with water in a closed glass reactor in vacuum (the initial pressure is 7.4 kPa) at 40 C to form Al(OH) 3 suspension (S-VAH), and then ltering by a lter paper and drying at 60 C to form Al(OH) 3 powder (VAH).…”

Section: Methodsmentioning

confidence: 99%

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Fluoride removal from water using high-activity aluminum hydroxide prepared by the ultrasonic method

2015

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Different Al(OH) 3 powders were used as adsorbents for fluoride removal from water. The results showed that the defluoridation performance of ultrasonically prepared Al(OH) 3 (UAH) is much better than that of commercially available Al(OH) 3 and is comparable to that of activated alumina, because the ultrasonic waves effectively break the agglomerates in the suspension so that the UAH particles are fine and have a beneficial phase constituent. Furthermore, the residual aluminum concentration in aqueous solution after defluoridation by Al(OH) 3 was found to be one order of magnitude lower than that obtained with activated alumina which is below the World Health Organization (WHO) guideline for aluminum (0.2 mg L À1 ) in drinking water. The defluoridation dynamics and mechanism for UAH are discussed in detail.

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Section: Methodsmentioning

confidence: 99%

“…39 Therefore, it is not easy to break these hard agglomerates, and the surface area of J-CAH almost has no change aer the ultrasonic treatment. Aer the ultrasonic treatment, the so agglomerates in S-VAH are broken, which increases the Al(OH) 3 surface area, leading to an increase in its F À removal.…”

Section: Physicochemical Mechanismsmentioning

confidence: 99%

Fluoride removal from water using high-activity aluminum hydroxide prepared by the ultrasonic method

2015

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“…The zero hydrogen generation of some aluminum powders in reaction with water during the first hour up to 80 hours of immersion has been observed in different works. [1,20,24,46] This zero hydrogen generation can be explained in two ways; the reaction did not start, or, the reaction started, but it was very slow so that no hydrogen flow was measured (the accuracy of the flowmeter for our experiments was 0.1 mL/min). Even the 1 hour milled particles, which most probably their oxide film was removed during milling, did not produce any measurable hydrogen.…”

Section: Resultsmentioning

confidence: 94%

Role of Ball Milling of Aluminum Powders in Promotion of Aluminum-Water Reaction to Generate Hydrogen

Razavi-Tousi

Szpunar

2014

Metallurgical and Materials Transactions E

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Effect of ball milling (BM) of an aluminum powder on hydrogen generation through a reaction with hot water was investigated. BM increased surface area of the aluminum particles, increased crystalline imperfections in the aluminum lattice, and removed a native oxide film on surface of the particles. The increase in surface area of the particles was studied by measurement of particle size and examination of cross section of the particles. The effect of crystalline imperfections was studied by room temperature recovery and high temperature annealing of the ball-milled particles. The effect of the native oxide film and its thickness was studied by exposing ball-milled aluminum particles to air for different durations. Hydrogen production capability of different aluminum powders after each of the above mentioned treatments was tested and correlated to microstructural changes.

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“…6 H. Z. Wang reviewed the methods for producing hydrogen by using aluminium and aluminium alloys. 4 W. Z. Gai studied the effects of initial gas pressure, 7 trace species in water, 8 aluminium particle size and temperature 1 on the reaction of aluminium and water. Important studies have identied the reaction mechanism, established the reaction mechanism model, which is based on the shrinking core model, and discussed the effects of different initial conditions on the reaction.…”

Section: Introductionmentioning

confidence: 99%