Hydride has been introduced into Al-BiCl3 composite by ball milling. The hydrogen generation performances of Al-BiCl3-hydride composite have been effectively promoted. Among of them, Al-BiCl3-Li3AlH6 is found to have the best performance of hydrogen yield (1293 mL·g-1), the conversion efficiency (94.4%) and the max HG rate (2098 mL·g-1·min-1) at 25 oC.

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Novel hydrides are produced by mechanically alloying at least two different hydrides, preferably at least one simple alkali metal hydride and at least one complex alkali metal hydride such as an alkali metal aluminum hydride; the method of production is simple and can be carried out at room temperature; the novel hydrides are useful as a source of hydrogen and have the particular …

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Ball milling Hydrogen storage 1. Introduction Light weighted metal hydrides are attractive materials for on board hydrogen storage mediums of fuel cell vehicles and for the negative electrodes of nickel-metal hydride batteries. Mg and Ti are most popular light weighted metallic elements which form stable hydrides.

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Mill suppliers can line ball mills with ceramics to reduce contamination from abrasive materials, but mill media wear is constant, which also can contaminate a product. Jet mills. Until the introduction of jet mills in 1936, dry grinding in the subsieve range of 625 mesh (20 microns) to 2,500 mesh (5 microns) was impractical.

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and then ball milled for 30 min in a high-energy Spex Mill. MgH 2 and LiAlH 4 with a molar ratio of 1:1 will be referred to as MgH 2−LiAlH 4 for simplicity. MgH 2−LiAlH 4 was also prepared under the same conditions for comparison purposes. All samples were loaded into a 80 mL stainless steel pot in an argon-filled glovebox. ZrO 2 balls ...

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10%Three types of alloys, nickel mixed, nickel ball-milled and nickel coated Mg2Ni alloy, were used as the active material of metal hydride electrodes. The ball-milling of the alloy with nickel powder results in an amorphous or nanocrystaline phase. Chemical coating of the alloy with nickel was carried out at 25°C.

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doping was performed by ball milling NaAlH4 with Ti(OiPr)4 and Zr-fluoride. The H2 evolution versus temperature for the as -synthesized materials is shown in Figure 3. The H2 evolution for the second Figure 4. Second-Cycle Desorption for 8 Hydride Samples Analyzed in a Single Run desorption, after re-hydriding, is shown in Figure 4.

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and controlled size distribution. Magnesium hydride (MgH 2) was supplied by Sigma-Aldrich and submitted to ball milling with tungsten carbide balls under H 2 atmosphere for 24 hours at 300 rpm using a Fritsch P-6 planetary mill. After that, the MgH 2 was milled for 20 minutes more with 5 wt. (%) of carbon nanotube. The samples were handled in a ...

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PRODUCED BY BALL MILLING R.A. VARIN1,T. CZUJKO1,3, ... hydride having various grain (crystallite) and powder particle sizes. MgH 2 hydride was also mixed with 5 wt% of n-Ni

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Magnesium hydride (MgH 2) was supplied by Sigma-Aldrich and submitted to ball milling with tungsten carbide balls under H 2 atmosphere for 24 hours at 300 rpm using a Fritsch P-6 planetary mill. After that, the MgH 2 was milled for 20 minutes more with 5 …

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elemental Mg powders after 200 h of high-energy ball milling under a hydrogen gas pressure of 50 bar. The as-prepared metal hydride powders were contaminated with 2.2 wt. % of FeCr-stainless steel that was introduced to the powders upon using stainless steel milling tools made of the same alloy.

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Titanium hydride with a body centred tetragonal structure was rapidly synthesized at room temperature by ball milling titanium powders under a hydrogen atmosphere. The structure evolution was monitored by x-ray diffraction and Rietveld analysis. Unit cell volume dilation suggests the hydrogenation process begins with the formation of a titanium - hydrogen solid …

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Mg 0.25 Mn 0.75, prepared through ball milling MgH 2 and Mn powders, is a nanocomposite where the nanometer-sized MgH 2 domains are randomly embedded in a Mn matrix. This sample readily and reversibly absorbs and desorbs deuterium even at a temperature of 200 °C without the addition of any catalysts.

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In this study, magnesium hydride co-catalyzed by ZrO 2 and Ni nanostructures were prepared using a high-energy ball-milling approach. The storage material was investigated for its composition, hydrogen adsorption rates, and thermodynamics. Hydrogen absorption and desorption rates were improved without increasing milling time.

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Magnesium hydride is one of the most promising candidates for solid-state hydrogen storage and thermal energy storage applications. The effects of V-based solid solution alloys on the hydrogenation and dehydrogenation behavior of magnesium hydride are studied. Significant reduction of the dehydrogenation temperature and improvements of the kinetics of both …

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A Ti-NaAlH 4 sample was then ball-milled for 2 h using a SPEX 8000 high-energy mixer/mill at a milling speed of 1,000 rpm, and the weight ratio of ball to powder was 10 : 1. 0.5–1.0 gram of sample was subjected to ball-milling each time in a 65 cm 3 SUS 304 vial by ZrO 2 balls of 1.3 cm in diameter.

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The cerium hydride phase formed during ball-milling was stable at high temperatures and, thus, the formation of this phase reduced the amount of desorbed hydrogen from the milled MgH 2-catalyst mixture. Increasing the milling time to 20 and 30 h also reduced the temperature of hydrogen desorption.

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Magnesium hydride undergoes a reversible conversion reaction and it has very good theoretical performances, ... The purpose of our study is to investigate the MgH 2 redox activity by evaluating the effect of ball milling pre-treatments and by studying the conversion reaction mechanism. Three materials, ...

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Abstract Large quantities of hydrogen (H2) are released at ambient temperatures as a result of mechanical dehydrogenation during ball milling of complex hydride composites such as (LiAlH4+5wt.% nanometric Fe), (nLiAlH4+LiNH2; n=1, 3, 11.5, 30), (nLiAlH4+MnCl2; n=1, 3, 8, 13, 30, 63) and (LiNH2+nMgH2; n=0.5-2.0). For both the (nLiAlH4+LiNH2) and (LiAlH4+5wt.% …

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the mechano-chemical synthesis of the Li-Al-N-Mg-based hydride composites using an energetic ball milling in a unique magneto-mill. For the (nLiAlH 4 +LiNH 2 ; n=1, 3, 11.5, 30) composite, at the molar ratio n=1, the

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Hydrolysis of ball milling Al–Bi–hydride and Al–Bi–salt mixture for hydrogen generation Mei-Qiang Fana,b, Fen Xua,∗∗, Li-Xian Suna,c,∗, Jun-Ning Zhaoa, T. Jianga,b, Wei-Xue Lia a Materials & Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China

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hydride alloy material for an improved Ni/MH, cell. Preparation technique of the alloys as well as its composition has been reported to affect the ... ingots, mechanical alloying (ball-milling), and atomization techniques. Arc-melting technique was studied at BNL, mechanical alloying at LANL, and the pulverization and atomization techniques at ...

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Over decades of research effort, ball milling and catalytic doping have been recognized as two important avenues to improve the kinetics of hydrogen absorption and desorption by magnesium hydride [10], [11], [12], [13], [14], [15], [16], [17].

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BALL MILLING PARAMETERS OF NIOBIUM HYDRIDE . 723. 14 Gray C T, Quality Reliability Eng Int, 4 (1988) 198. 15 Bie X, Lu J, Wang Y, G ong …

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Neto et al. (2017) doped TiFe compound into MgH 2 and concluded that a fine dispersion could be achieved by increasing milling time or using higher energy ball mill. To attain the best hydrogen kinetics, the sample prepared in the planetary mill for 36 h was the optimum selection and the MgH 2 + 40 wt%TiFe sample milled for 36 h could release ...

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MgH2 (i.e. before ball milling). The present article reports further studies on ball milled magnesium hydride samples. Magnesium hydride crystalizes in a rutile-type structure with spacegroup P42/mmm. MgH2 transforms in an or-thogonal -phase ( -PbO2-type structure) at high temper-atures and pressures [8]. In ball milled samples this phase is

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The invention relates to a mechanical ball milling method for producing iron nitride magnetic powder. The method using ball milling and nitriding includes: selecting iron powder 2-80 Mum in average particle size as a raw material, placing the iron powder into a ball milling tank, selecting a ball-material ratio to be 10:1-50:1, charging nitrogen 0.1-0.5 Mpa, or selecting ammonia …

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A scanning electron micrograph of another commonly used high temperature metal hydride, MgH2, after ball milling is shown in 2. The surface and morphology of Mg particles after milling were rough and irregular. SEM observation showed small catalyst particle clusters covering larger Mg particles after milling. The surface area and effective ...

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Develop and demonstrate light-metal hydride systems that meet or exceed the 2010/2015 DOE goals for on-board hydrogen storage through the validation of storage properties and reversibility in light element hydrides • Nanophase, destabilized hydrides based upon LiH, MgH ... as a result of ball milling. ...

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Furthermore, the milling in benzene destabilizes the alloy hydride. The ball milling in organic solvent offers a new way for magnesium-based hydrogen storage materials, exploiting their higher ...

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