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Magnesium-calcium-based hydride powder for wide-temperature zone hydrolysis hydrogen generation and preparation method for magnesium-calcium-based hydride powder

A magnesium-calcium-based hydride and based hydride technology, which is applied in the production of alkali metal/alkaline earth metal/beryllium/magnesium hydride and hydrogen, can solve the problems of poor hydrolysis performance, uncontrollable process and safety of hydride composite materials. Low-level problems, to achieve the effect of increasing the actual hydrogen production, increasing the hydrogen production rate, and ensuring safety

Active Publication Date: 2014-05-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors of this patent application have found through research that due to Ca 4 Mg 3 h 14 High activity, when used as a hydrogen storage material to produce hydrogen by hydrolysis, the reaction will be quite violent, the whole process is uncontrollable, and the safety is low
[0005] Chinese patent CN101891151 discloses "a magnesium-aluminum hydride composite material for hydrogen production by hydrolysis", but the prepared hydride composite material has poor hydrolysis performance at room temperature and low temperature, and the actual hydrogen release rate is low

Method used

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  • Magnesium-calcium-based hydride powder for wide-temperature zone hydrolysis hydrogen generation and preparation method for magnesium-calcium-based hydride powder
  • Magnesium-calcium-based hydride powder for wide-temperature zone hydrolysis hydrogen generation and preparation method for magnesium-calcium-based hydride powder
  • Magnesium-calcium-based hydride powder for wide-temperature zone hydrolysis hydrogen generation and preparation method for magnesium-calcium-based hydride powder

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Experimental program
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Effect test

Embodiment 1

[0034] The magnesium-calcium alloy containing 35wt% calcium and 65wt% magnesium is crushed to less than 200 meshes, and ball milled for 2h under the condition of argon atmosphere with a ball-to-battery ratio of 20:1. Then the powder obtained by ball milling is placed in Sieverts-type (Western In the Fitz type) device, activate 4 times at a temperature of 400°C and a hydrogen pressure of 4 MPa, and then absorb hydrogen for 24 hours to obtain magnesium-calcium-based hydride powder. The SEM image is shown in figure 1 , Of which magnesium calcium hydride Ca 4 Mg 3 H 14 50.2wt%, magnesium hydride MgH 2 It is 47.3wt%, and the balance Mg is 2.5wt%.

[0035] Take 0.2g of the prepared magnesium-calcium-based hydride powder and place it in a reactor at a constant temperature of 0°C, and inject 10ml of distilled water at a temperature of 0°C for the reaction, and collect the hydrogen by the drainage gas collection method and react for 60 minutes. The conversion yields 775ml of hydrogen per g...

Embodiment 2

[0037] The magnesium-calcium alloy containing 25wt% calcium and 75wt% magnesium is crushed to less than 300 mesh, and ball milled for 3h under the conditions of argon atmosphere and ball-to-battery ratio of 20:1, and then the powder obtained by ball milling is placed in Sieverts-type (Western In the Fitz type) device, activate 4 times at a temperature of 400°C and a hydrogen pressure of 4.5 MPa, and then absorb hydrogen for 6 hours to obtain a magnesium-calcium-based hydride powder, in which the magnesium-calcium hydride Ca 4 Mg 3 H 14 35.8wt%, magnesium hydride MgH 2 It is 61.5wt%, and the balance Mg is 2.7wt%.

[0038] Take 0.2g of the prepared magnesium calcium-based hydride powder and place it in a reactor at a constant temperature of 10°C, and inject 10ml of distilled water at a temperature of 10°C for reaction, and collect hydrogen by the drainage gas collection method, and react for 60 minutes. The conversion yields 585ml of hydrogen per gram of the above materials.

Embodiment 3

[0040] (1) The magnesium-calcium alloy containing 35wt% calcium and 65wt% magnesium is crushed to less than 100 mesh, and ball milled for 1h under the conditions of argon atmosphere and ball-to-battery ratio of 8:1, and then the powder obtained by ball milling is placed in Sieverts -type (Siffertz type) device, activated once at a temperature of 400°C and a hydrogen pressure of 3.5MPa, and then hydrogenated for 24 hours to obtain magnesium-calcium-based hydride powder, of which the magnesium-calcium hydride Ca 4 Mg 3 H 14 50.2wt%, magnesium hydride MgH 2 It is 34.8wt%, and the balance Mg is 15.0wt%.

[0041] (2) The obtained magnesium-calcium-based hydride powder is mechanically ball-milled in a ball mill under an argon atmosphere with a ball-to-material ratio of 2:1 for 10 hours.

[0042] Take 0.2g of the prepared magnesium-calcium-based hydride powder and place it in a reactor at a constant temperature of 25°C, and inject 10ml of distilled water at a temperature of 25°C for reacti...

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Abstract

The invention discloses magnesium-calcium-based hydride powder for hydrolysis hydrogen generation. The magnesium-calcium-based hydride powder comprises the following components in percentage by mass: 14.2 to 50.2 percent of Ca4Mg3H14, 34.8 to 85.7 percent of MgH2 and 0.1 to 15 percent of Mg. In order to increase the hydrolysis hydrogen generation rate, other hydrides and / or salts can also be compounded, and the mass content of the other hydrides is 0 to 5 percent based on the total mass of the components Ca4Mg3H14, MgH2 and Mg; the mass content of the salts is 0 to 11 percent based on the total mass of the components Ca4Mg3H14, MgH2 and Mg; the content of the other hydrides and the content of the salts is not 0 simultaneously. According to the preparation method for the magnesium-calcium-based hydride powder, a magnesium-calcium alloy is activated for hydrogen absorption after being crushed and ball-milled. According to the magnesium-calcium-based hydride powder for the hydrolysis hydrogen generation, the hydrogen yield can be increased on the premise of ensuring the reaction safety and controllability, and particularly the hydrogen yield at room temperature and low temperature is increased.

Description

Technical field [0001] The invention belongs to the technical field of hydrolysis hydrogen production materials, and particularly relates to a magnesium-calcium-based hydride powder for hydrolysis hydrogen production and a preparation method. Background technique [0002] Hydrogen energy has attracted much attention as a clean energy and high-density energy carrier, and is considered to be an ideal mobile energy source in the future. The use of hydrogen energy first needs to solve the hydrogen source problem, but the traditional hydrogen production process not only consumes a lot of energy, but also has relatively low hydrogen production efficiency. At the same time, because hydrogen is flammable and explosive, the safety of hydrogen application is also a problem that must be addressed and resolved. Therefore, finding low-energy, high-efficiency, safe and stable hydrogen storage technologies and hydrogen production methods is of great significance for hydrogen energy utilization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/06C01B6/04
CPCY02E60/36
Inventor 吴朝玲陈云贵刘佩佩吴海文
Owner SICHUAN UNIV
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