Production of High‐Purity Hydrogen and Layered Doubled Hydroxide by Hydrolysis of Mg‐Al Alloys

Abstract

Hydrogen is becoming an important clean energy and layered doubled hydroxide (LDH) is of great interest for many applications, including water treatment, environmental remediation, and chemical catalysis. The production of high‐purity hydrogen and LDH by the hydrolysis of Mg‐Al alloys is reported. The effects of initial pH, reaction temperature, reaction time, and alloy's Mg/Al mass ratio on the rate of hydrogen generation and the purity of LDH are evaluated and the solid hydrolysis products are characterized by different techniques. The initial rate of hydrogen generation increases with decreasing initial pH and increasing reaction temperature and Mg/Al ratio while the purity of LDH increases with Mg/Al ratio, reaction temperature and time. This study may provide a new, green, and sustainable approach for storage of hydrogen and material for water treatment.

Groundwater remediation using Magnesium–Aluminum alloys and in situ layered doubled hydroxides

“…2c, d) shows that the hydrolysis product of the Mg-Al alloy displays a typical flower-like structure of LDH. In a recent study, the composition and the BET surface area of the LDH J o u r n a l P r e -p r o o f obtained by the hydrolysis of Mg-Al alloys were determined to be [Mg18Al7(OH)50][Cl3(CO3)25H2O] and 37-55 m 2 /g, respectively (Zheng et al 2021).…”

Hydrogen Production Properties of Aluminum–Magnesium Alloy Presenting β-Phase Al3Mg2

“…The presence of precipitates of Al 3 Mg 2 has been previously investigated, and it has been demonstrated that their presence y induced structural strengthening. Furthermore, the Al 3 Mg 2 phase is typically stabilized through prolonged annealing [7,9,10] or milling times [11,12], high pressures [11], or temperatures exceeding 450 • C (the eutectic temperature on the phase diagram), leading to liquid-state sintering [13].…”

Regulation of the integrated hydrogen storage properties of magnesium hydride using 3D self-assembled amorphous carbon-embedded porous niobium pentoxide

“…Transition metals, 8–10 transition metal derivatives, 11–16 and carbon composites 17–20 have been proven to be ideal dopants to improve the hydrogen storage properties for MgH 2 . Liang et al 10 used ultra-fine nickel nanoparticles of 2–6 nm sizes to improve the hydrogen storage properties of MgH 2 and found that Ni nanoparticles reacted with Mg and H 2 to form Mg 2 NiH 0.3 /Mg 2 Ni during hydrogen uptake and discharge.…”

“…3,4 Among different solid-state hydrogen storage materials, magnesium hydride (MgH 2 ) has attracted signicant attention because of its high hydrogen storage capacity (7.6 wt%), abundant earth reserves, and low cost; 5,6 however, the high working temperature and the slow kinetic performance hinder its applications. 7 Transition metals, [8][9][10] transition metal derivatives, [11][12][13][14][15][16] and carbon composites [17][18][19][20] have been proven to be ideal dopants to improve the hydrogen storage properties for MgH 2 . Liang et al 10 used ultra-ne nickel nanoparticles of 2-6 nm sizes to improve the hydrogen storage properties of MgH 2 and found that Ni nanoparticles reacted with Mg and H 2 to form Mg 2 NiH 0.3 /Mg 2 Ni during hydrogen uptake and discharge.…”