Kinetics study of the Al–water reaction promoted by an ultrasonically prepared Al(OH)₃ suspension

Abstract

The hydrogen-generation rate of Al in a Al(OH)3 suspension is comparable to the behavior of Al in a NaOH solution.

Hydrogen generation by aluminum-water reaction in acidic and alkaline media and its reaction dynamics

“…After removal of the alumina film, the Al–H 2 O reaction starts and a core‐shell structure formed. The exterior consists of a hydration layer that contains Al(OH) 3 /Al(OH) 4 − , and the interior consists of metallic Al . The fresh hydration layer on the Al surface has a relatively large specific amorphous and porous surface area (Figure C), which facilitates OH − and H 2 O transport and increases the concentration at the interface of Al/Al(OH) 3 /Al(OH) 4 − , resulting in Al corrosion.…”

“…And the dissolution of Al(OH) 3 the interior consists of metallic Al. 23 The fresh hydration layer on the Al surface has a relatively large specific amorphous and porous surface area ( Figure 5C), which facilitates OH − and H 2 O transport 24,25 and increases the concentration at the interface of Al/Al(OH) 3 /Al(OH) 4 − , resulting in Al corrosion.…”

Semisolid Al–Ga composites fabricated at room temperature for hydrogen generation

“…Some active metals can be used to produce hydrogen by their chemical reactions with an aqueous solution; among these, aluminium is preferred because of its low cost, abundant reserves and environment-friendliness. 3,4 However, since aluminium is easily oxidized, it is difficult for pure aluminium to react with water continually. Therefore, the key for hydrogen generation from aluminium is to remove the thin layer of oxides from aluminium.…”

Kinetics study on the generation of hydrogen from an aluminum/water system using synthesized aluminum hydroxides

“…Deng et al have demonstrated the mechanism and influence factors for the generation of hydrogen from an Al/water system. They proposed that hydroxide and oxides could dissociate water molecules and promote the hydration of the passive oxide film on the surface of Al particles .…”

“…The reclaims of Al metals from the reaction waste, Al(OH) 3 , can be done by a low temperature (<100°C) chemically reduction method in ionic liquids, making Al/water an excellent system for the clean energy. 18 Deng et al [19][20][21][22][23] have demonstrated the mechanism and influence factors for the generation of hydrogen from an Al/water system. They proposed that hydroxide and oxides could dissociate water molecules and promote the hydration of the passive oxide film on the surface of Al particles.…”