Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5145455 | International Journal of Hydrogen Energy | 2017 | 7 Pages |
Abstract
Mg is an attractive candidate for hydrogen generation due to its low cost and high availability as well as its high theoretical H2 yield and the formation of environmentally friendly byproducts during hydrolysis. On the other hand, the hydrolysis reaction of Mg is rapidly interrupted by the formation of a passive magnesium hydroxide layer. Hydrogen generation via the reaction of ball milled Mg-oxide composites with 3.5% NaCl solution at room temperature was investigated in this paper. Several cheap metal oxides (Fe2O3, CaO, MoO3, Fe3O4, Nb2O5 and TiO2) were used to assess the effects of hydrolysis on the magnesium powder. The results show that Mg-5Â wt% MoO3 and Fe2O3 demonstrate the best hydrolysis performance (above 888Â mL/g and 95.2% of theoretical hydrogen generation yield in 10Â min) in comparison to MgFe3O4, MgTiO2, MgNb2O5 and MgCaO composites. In addition, the effects of different Mg contents and milling times on the hydrolysis property of the Mg powder were also studied and it was concluded that the addition of 5Â wt% oxide and a milling time of 1Â h are the optimal parameters for the production of the MgMoO3 composite. Moreover, the valence state of metal ions was found to have an important influence on the hydrolysis reaction for the first time. The effect of valence state has been studied for Mg-Fex+ and Mg-Mox+ composites and the results show that a higher valence value of the transition metal ions leads to a better hydrolysis property of Mg.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Minghong Huang, Liuzhang Ouyang, Zhiling Chen, Chenghong Peng, Xiaoke Zhu, Min Zhu,