Kinetically Controllable Hydrogen Generation at Low Temperatures by Alcoholysis of CaMg2-Based Materials in Tailored Solutions

ChemSusChem
Miaolian MaMin Zhu

Abstract

Alcoholysis of CaMg2-based materials for hydrogen generation has been reported here. Hydrogen supply via the alcoholysis shows excellent outdoor application potential, which not only bypasses the formation of passivation layers but also breaks the temperature bottleneck. To remove the troublesome freezing issue of the water solution system in low-temperature, here, instead of pure methanol, methanol-water/ethanol solutions are applied to react with CaMg2 alloy and its hydrides for hydrogen generation. Compared with pure water and ethanol, the reaction of CaMg2-based materials with methanol possesses much faster reaction kinetics and considerable hydrogen yield. The CaMg2 can generate 858 mL/g H2 within 3 min while it reacts vigorously with methanol, as opposed to low hydrogen yield with ethanol and water (395 and 224 mL/g H2 within 180 min, respectively) under same conditions. Even at -20 °C, there is still over 600 mL/g H 2 released at a conversion rate of 70.7% within 100 min for methanolysis, rendering it a prominent advantage for hydrogen production, especially in winter or subzero areas. Interestingly, the methanolysis by-products can transform into metal hydroxides and methanol while reacting with water, wherein methanol ...Continue Reading

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