Uesugi H.,BIOCOKE Laboratory Ltd. |
Sugiyama T.,BIOCOKE Laboratory Ltd. |
Nii H.,BIOCOKE Laboratory Ltd. |
Ito T.,BIOCOKE Laboratory Ltd.
Journal of Alloys and Compounds | Year: 2011
A process for the industrial production of magnesium hydride (MgH 2) based on a thermal equilibrium method and its application to portable hydrogen sources is proposed. Mg powders and tablets compressed with mechanically ground Mg ribbons were successfully hydrogenated in a 50-kg-batch furnace. The resultant MgH2 showed a hydrogen yield of around 96% with good reproducibility. The compression ratio of Mg tablets was found to be an important factor in the hydrogenation yield. A hydrolysis technique using citric acid as an additive was employed to generate hydrogen under 373 K. Increasing the concentration of citric acid and the temperature accelerated the hydrolysis reactivity. A hydrogen reactor utilizing hydraulic head pressure was developed. It generated hydrogen continuously for 1 h at a flow rate of 100 ml min-1 with hydrolysis of 5 g of tablet-form MgH2. The conversion yield was around 70%, regardless of the flow rate. © 2010 Elsevier B.V. All rights reserved.