Abstract
One of the future technologies for a safe hydrogen storage media is metal hydrides. Currently, Mg-based metal hydride has a safety factor and efficient for vehicle applications. However, the thermodynamic properties of magnesium hydride (MgH 2 ) found a relatively high temperature. High desorption temperatures caused MgH 2 high thermodynamic stability resulting desorption enthalpy is also high. In this study, natural mineral (iron ore) has been extracted from iron sand into powder of magnetite (Fe 3 O 4 ) and used as a catalyst in an effort to improve the desorption properties of MgH 2 . Magnetie has been successfully extracted from iron sand using precipitation method with a purity of 85 % , where the purity of the iron sand before extracted was 81%. Then, MgH 2 -Fe 3 O 4 was milling using mechanical alloying method with a variety of catalysts and milling time. The observation by XRD showed the material was reduced to nanocrystalline scale. MgH 2 phase appears as the main phase. DSC test results showed with the addition of Fe 3 O 4 , the desorption temperature can be reduced up to 366 o C, compared to pure pure MgH2 reached by 409 o C. Furthermore, based on gravimetric test, the hydrogen release occurs at a temperature of 388 o C, weight loss of 0.66 mg during 16 minutes.
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