Modified Fe₃O₄ samples for hydrogen storage with different metal additives (Mo, Al, Cr, W) used in this work were prepared by precipitation of Fe₃O₄ from the aqueous solution of FeCl₃ and (NH₄)₂Fe(SO₄)₂•6H₂O. The apparatus used for the reduction and reoxidation of Fe₃O₄-Mo, Fe₃O₄-Al, Fe₃O₄-Cr, Fe₃O₄-W and Fe₃O₄-none samples was a value system of the performance of hydrogen storage with a fixed bed of the samples at the center of a quartz-made tubular reactor. These samples were characterized and measured by X-ray powder diffraction, scanning electron microscope and BET surface area analyzer. The results show that the temperatures of the samples Fe₃O₄-Mo in their 4 cyclic tests in the range of 310～314 ℃ (the flow rate of H₂ was 300 μmol•min^―1•Fe-g^―1 at this time), were lower than that of the Fe₃O₄-none, and even lower than that of similar best one by 50 ℃. Moreover, the size of the samples Fe₃O₄ prepared by the present method used in this paper was 50～70 nm. Furthermore, cyclic stabilities and catalytic activities of the samples depended on the type of added metal and the size of the particle of the samples.

Key words: modified Fe₃O₄, hydrogen storage material, hydrogen storage property, cyclic stability