Effect of storage environment on hydrogen generation by the reaction of Al with water

Abstract

Water vapor rather than oxygen is responsible for the degradation of Al activity during storage in atmospheric environment.

Improved hydrogen generation from Al/water reaction using different synthesized Al( OH ) 3 catalyst crystalline phases

“…The activity of Al(OH) 3 depends on its superficial interaction and the contact between Al and Al(OH) 3 25 . When the small sharp edges of the casually assembled hexagonal plate‐like crystals of Al(OH) 3 NPs contact the H 2 O molecule, the water molecule dissociates into OH − and H + 46‐50 . These ions dissociated from H 2 O molecules on the Al(OH) 3 surface easily react with a passive oxide layer on the Al surface, 51 promoting and speeding up hydration development.…”

“…25 When the small sharp edges of the casually assembled hexagonal plate-like crystals of Al(OH) 3 NPs contact the H 2 O molecule, the water molecule dissociates into OH − and H + . [46][47][48][49][50] These ions dissociated from H 2 O molecules on the Al(OH) 3 surface easily react with a passive oxide layer on the Al surface, 51 promoting and speeding up hydration development. Synthesized Al(OH) 3 NPs catalyst is consumed and regenerated in the in-situ exothermic reaction of Al/H 2 O system and produces 100% (reduces the initiation time) hydrogen yield.…”

Oxide modified aluminum for removal of methyl orange and methyl blue in aqueous solution

“…In this case, the new formed passive oxide film on OM-Al is thinner than that on pristine Al particles, because the thickness of passive oxide film on Al is proportional to its exposure time in air. 63 Therefore, the thinner passive oxide film on OM-Al is the second reason leading to its higher M-orange and M-blue removal efficiency. A schematic representation of M-orange and M-blue removal by OM-Al in aqueous solution is shown in Scheme 1 .…”

Effect of crystalline phases of aluminum hydroxide catalysts on Al‐water reaction

“…6 During the past decades, researchers have made great progress in Al-hydrogen technology field and developed various methods to promote Al-water reaction, such as Al corrosion in alkaline solution, 7,8 Al alloys, [9][10][11][12] high energy milling, [13][14][15][16] and catalytic reaction. [17][18][19] For example, Macanas et al 7 developed a hydrogen production method from Al hydrolysis through adding inorganic promoters into water, because inorganic salts inhibited the repassivation of metal Al. The hydrolysis reaction of Al is affected by both the solution pH value and the nature of anions found in aqueous solution.…”