Abstract
A specimen consisting of 90 wt.% Mg and 10 wt.% TiCl3 (called 95 Mg + 10 TiCl3) was made by transformation-accompanying milling, and its hydrogenation and dehydrogenation features were checked. The activation of 95 Mg + 10 TiCl3 was not demanded. 95 Mg + 10 TiCl3 revealed an useful hydrogenation-dehydrogenation capacity (the quantity of hydrogen absorbed in 60 min) of about 5.6 wt.%. At n = 1, the specimen absorbed 4.06 wt.% of hydrogen in 5 min, 5.09 wt.% of hydrogen in 10 min, and 5.59 wt.% of hydrogen in 60 min at 593 K in 1.2 MPa H2. At n = 1, the specimen desorbed 0.47 wt.% of hydrogen in 2.5 min, 3.81 wt.% of hydrogen in 30 min, and 5.20 wt.% of hydrogen in 60 min at 593 K in 0.1 MPa H2. The XRD pattern of 95 Mg + 10TiCl3 dehydrogenated at the 4th hydrogenation-dehydrogenation cycle included Mg, β-MgH2, MgO, and a small amount of TiH1.924 phases. The P (equilibrium hydrogen pressure)-C (composition)-T (temperature) curve at 593 K revealed an equilibrium plateau pressure at about 0.25 MPa. 95 Mg + 10 TiCl3 had a higher early hydrogenation rate and a larger amount of hydrogen absorbed in 60 min than Mg, 90 Mg + 10 Fe2O3, 90 Mg + 10 MnO, and 90 Mg + 10 TaF5, the hydrogenation and dehydrogenation features of which were before informed of.DOI: http://dx.doi.org/10.5755/j01.ms.23.3.16375
Highlights
The storage of hydrogen using metal hydrides as hydrogenation and dehydrogenation media has several strengths over storage by compression, storage by liquefaction, and storage by adsorption with carbon nanotube: metal hydrides own a higher hydrogenation and dehydrogenation capacity on the basis of volume and hydrogen storage by metal hydrides is safer than storage by compression and storage by liquefaction
90 Mg + 10 TiCl3 revealed an useful hydrogenation-dehydrogenation capacity of about 5.6 wt.%
The X-ray diffraction (XRD) diagram of 95 Mg + 10 TiCl3 after transformation-accompanying milling showed that the specimen included Mg, β-MgH2, and small quantities of γMgH2 and TiH1.924 phases. β-MgH2 and γ-MgH2 were built by the combination of Mg with hydrogen during transformation-accompanying milling. β-MgH2 and γMgH2 are low-pressure and high-pressure forms of MgH2, respectively, each being belong to tetragonal and orthorhombic crystal systems
Summary
The storage of hydrogen using metal hydrides as hydrogenation and dehydrogenation media has several strengths over storage by compression, storage by liquefaction, and storage by adsorption with carbon nanotube: metal hydrides own a higher hydrogenation and dehydrogenation capacity on the basis of volume and hydrogen storage by metal hydrides is safer than storage by compression and storage by liquefaction. Magnesium hydride milled with different halides was prepared by Malka et al [11] to check the optimum percentage of added halide and preparing conditions. They investigated the influences of these added halides on the dehydrogenation temperature of MgH2 and the decrease in activation energy for dehydrogenation. Considering electronic states of the metals in selected halides, the effects of the selected halides on MgH2 decomposition temperature were discussed They informed of that TiCl3 was one of the halides with the best catalytic effects for the dehydrogenation of magnesium hydride, among the studied halides. Scanning electron microscope (SEM) micrographs of the specimens were obtained in a JSM-5900 SEM operated at 15 kV
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