AlH3/MgCl2 nanometer complex powder preparation method

A technology of nanocomposites and powders, applied in chemical instruments and methods, metal hydrides, inorganic chemistry, etc., can solve the problems of harsh reaction conditions, large grain size, and low dehydrogenation capacity, and achieve high thermal activity and easy Effect of dehydrogenation and cost reduction

Active Publication Date: 2014-07-16
HARBIN INST OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of AlH containing AlH prepared by existing methods. 3 Phase precursor materials have complex processes, low dehydrogenation, and AlH 3 The disadvantages of large grain size, harsh reaction conditions and high cost provide an AlH 3 / MgCl 2 Preparation method of nanocomposite powder

Method used

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  • AlH3/MgCl2 nanometer complex powder preparation method
  • AlH3/MgCl2 nanometer complex powder preparation method
  • AlH3/MgCl2 nanometer complex powder preparation method

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specific Embodiment approach

[0018] Specific embodiments: this embodiment is a kind of AlH 3 / MgCl 2 The preparation method of nanocomposite powder is specifically completed according to the following steps:

[0019] 1. Preparation of nanocrystalline MgH 2 Powder: Put magnesium powder with a particle size of 0.1mm to 2mm or magnesium alloy powder with a particle size of 0.1mm to 2mm in a ball mill pot, put the ball into the ball at a mass ratio of (30 to 120):1, and Ball milling at a speed of 250r / min to 400r / min for 15h to 20h under a hydrogen atmosphere to obtain nanocrystalline MgH with a grain size of 9nm to 11nm and a powder particle size of 1μm to 10μm 2 powder;

[0020] 2. Ball milling and reaction: ① Firstly, the nanocrystalline MgH 2 Powder and AlCl 3 Mix the powder evenly, then put it in the ball mill jar, put the ball into the ball according to the mass ratio of ball to material (30~120):1; ②under the condition of hydrogen atmosphere and pressure of 0.2MPa~1.0MPa, use Min ~ 400r / min speed...

specific Embodiment approach 2

[0025] Embodiment 2: This embodiment differs from Embodiment 1 in that: the magnesium alloy described in step 1 is ZK60; the Mg content in the ZK60 is 93.5%, the Zn content is 6%, and the Zr content is 0.5%. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step one, magnesium powder or magnesium alloy powder with a particle size of 0.05 mm to 2 mm is placed in a ball mill jar , according to the ratio of mass ratio of ball to material (40-100): 1, put the ball into the ball, and ball mill at a speed of 300r / min-400r / min for 16h-20h under the hydrogen atmosphere to obtain a powder with a grain size of 9nm-11nm. Nanocrystalline MgH with a particle size of 1 μm to 10 μm 2 powder. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses an AlH3 / MgCl2 nanometer complex powder preparation method, and relates to a preparation method for an AlH3 phase-containing precursor material. A purpose of the present invention is to solve disadvantages of complex process, low dehydrogenation amount, large AlH3 grain particle size, harsh reaction conditions and high cost of the existing preparation method for the AlH3 phase-containing precursor material. The preparation method comprises: 1, preparing nanometer crystal MgH2 powder; and 2, carrying out ball milling, and carrying out a reaction. According to the present invention, the particle size of the AlH3 grain in the prepared AlH3 / MgCl2 nanometer complex powder is 5.5-6.5 nm, the prepared AlH3 / MgCl2 nanometer complex powder has advantages of high thermal activity and easy dehydrogenation, vacuum dehydrogenation test results show that the dehydrogenation amount of the AlH3 / MgCl2 complex powder can achieve 8.5-9 wt%, and the preparation method has advantages of simple process, low cost, easily achieved reaction conditions and low risk, and is suitable for industrial preparation of the AlH3 precursor material.

Description

technical field [0001] The present invention relates to a kind of containing AlH 3 Preparation methods of phase precursor materials. Background technique [0002] H 3 It is off-white crystal with a density of about 1.48g / cm 3 , and its theoretical hydrogen storage content is 10.08wt.%. It can release hydrogen at 150°C, and it is one of the promising hydrogen storage materials. H 3 As a high-energy fuel, it has the advantages of high specific impulse, lower combustion temperature, and good compatibility, making it possible to apply it to solid propellants; as an excellent hydrogen storage material, AlH 3 It has certain applications in the fields of fuel cells, organic chemical synthesis, polymer synthesis and atomic layer deposition technology. Although theoretically AlH 3 It is an ideal hydrogen storage material, but the current preparation contains AlH 3 The method of the precursor material of the phase is mostly wet synthesis: with LiAlH 4 and 100%H 2 SO 4 As th...

Claims

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Application Information

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IPC IPC(8): C01B6/06
Inventor 胡连喜段聪文薛旦
Owner HARBIN INST OF TECH
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