Hydrogen-generating compositions based on magnesium

Influence of the support structure and composition of Ni–Cu-based catalysts on hydrogen production by methanol steam reforming

“…The most common are lowtemperature fuel cells with proton-exchange membrane [1e3]. However, hydrogen does not exist in nature in a pure form; therefore there is a problem of its synthesis [4]. Methane can be considered as a promising feedstock for technical hydrogen obtaining.…”

Autonomous Hydrogen Production for Proton Exchange Membrane Fuel Cells PEMFC

“…The energy required to recycle the Mg alloy into the secondary ingot (see Figure 5) is between 7.2 to 14.2 MJ/kg. This is greater than the energy required to produce hydrogen from Mg waste evaluated to be 3.9 MJ/kg [36], for instance, for the insertion of the catalyst. As a consequence, using Mg waste to produce hydrogen is thus economically viable.…”

“…The authors [31] explained that the metal reduced to M 0 during the grinding process as a result of the replacement reaction between Mg and the chlorides. During hydrolysis, an electrochemical interaction (a local galvanic cell) [32][33][34][35][36] occurs between metallic elements in the presence of Mg in the alkaline medium, which plays a crucial role in the reaction efficiency improvement.…”

“…Currently, the recycling of alloy wastes to secondary ingot concerns only high purity magnesium (Classes 1 and 2). More than half of the Mg wastes (Classes 3 to 8, i.e., low-grade alloys) are not recycled as it is not economically viable [36][37][38]. However, it was shown recently [39][40][41] that these alloys (Classes 1 to 8) produce hydrogen through hydrolysis using a 3.5 mass% aqueous solution of NaCl.…”

“…However, it was shown recently [39][40][41] that these alloys (Classes 1 to 8) produce hydrogen through hydrolysis using a 3.5 mass% aqueous solution of NaCl. The reaction is catalyzed using a platinum-coated titanium net (namely, Ti-Pt) [39][40][41] and 304 stainless steel [36]. The energy required to recycle the Mg alloy into the secondary ingot (see Figure 5) is between 7.2 to 14.2 MJ/kg.…”