Effect of TiO2 on Hydrogen Desorption Properties of Al3Mg2

Studies have shown that magnesium-based compounds can be used as solid state hydrogen storage materials. In this study, the Al3Mg2 intermetallic compound was prepared by casting method. Then samples of this compound were ball milled under hydrogen atmosphere at different times. Results of thermo-gravimetry and X-ray diffraction analyses showed that the highest amount of hydrogen storage was achieved after 2 h of ball milling under hydrogen atmosphere. A weight loss of about 2.4% was achieved from mentioned sample that is the highest among the samples. This weight loss occurred during three steps at temperatures of 150, 220 and 360 °C. In the next step, Al3Mg2 ingot along with TiO2 (as catalyst) was ball milled at different times under hydrogen atmosphere. The results of thermo-gravimetry and x-ray diffraction tests showed that the highest amount of hydrogen storage in this sample was achieved after 2 hours hydrogenation and a weight loss of about 2.6% by weight was obtained due to hydrogen desorption, which is close to the theoretical value.