Abstract
Abstract Hydrogen generation via Al hydrolysis is significantly affected by the poor kinetics resulting from the compact by-product layer. In this study, a relatively low-cost fully-hydrogenated Al3Mg2 alloy, MgH2–Al (MHA) is mixed with NaOH by ball milling to solve this problem. MgH2 and small amount of NaOH additive are beneficial to the activation and particle refining of Al during ball milling, furthermore, MgH2 can provide part of the generated hydrogen during hydrolysis. The mixture after 2 h ball milling thus shows good hydrolysis properties in NaOH and KOH aqueous solutions, generating 1488.2 and 1452.8 mL/g of hydrogen in 60 min at 328 K, respectively. The activation energies of the hydrolysis reaction in the NaOH and KOH solutions are reduced to 29.3 and 32.19 kJ/mol, respectively, which may also result from the increased MgH2 hydrolysis and the generation of the non-compact by-product Mg2Al(OH)7 in the alkaline solutions, there by promoting the hydrolysis process.
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