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Surface catalyzed high activity magnesium-base hydrogen storing material and preparing method thereof

A technology for surface catalysis and hydrogen storage materials, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of reducing the hydrogen storage capacity of materials, unfavorable practical application of magnesium-based alloys, loss of mechanical energy, etc. , to achieve the effect of high hydrogen storage capacity and good hydrogen storage kinetics

Inactive Publication Date: 2009-04-29
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above reports, the hydrogen absorption and desorption temperature still needs to be around 300 °C
In addition, long-term ball milling consumes a large amount of mechanical energy, which also reduces the hydrogen storage capacity of the material.
These are not good for the practical application of magnesium-based alloys

Method used

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  • Surface catalyzed high activity magnesium-base hydrogen storing material and preparing method thereof
  • Surface catalyzed high activity magnesium-base hydrogen storing material and preparing method thereof
  • Surface catalyzed high activity magnesium-base hydrogen storing material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Magnesium metal powder is purchased commercially, and the catalyst used in the test is prepared as follows: the design alloy composition is Ti-15Mn-15Cr-25V-5Fe, and the purity of each elemental raw material is all above 99.5%. Repeated melting for 4 times on the frequency magnetic levitation melting furnace to ensure the uniformity of the alloy. The obtained alloy is the as-cast alloy.

[0023] The preparation of the high-activity magnesium-based alloy is as follows: the magnesium powder is mixed with 50wt% of Ti-15Mn-15Cr-25V-5Fe and then ball milled for 5 hours under hydrogen atmosphere. figure 1 It is the X-ray diffraction pattern after ball milling. It can be seen that the alloy has become amorphous after 5 hours of ball milling. figure 2 The mass spectrometry results show that the initial hydrogen desorption temperature of magnesium powder modified by BCC alloy is reduced to about 250 °C.

Embodiment 2

[0024] Example 2: The catalyst alloy composition is designed to be Ti-15Mn-15Cr-30V, and the purity of each elemental raw material is above 99.5%. A 50-gram sample is repeatedly smelted 4 times on a high-frequency magnetic levitation melting furnace to ensure that the alloy is uniform . The obtained as-cast alloy was hydrogenated for 2 hours at room temperature and under a hydrogen atmosphere of 10 atmospheres, and the obtained BCC alloy after absorbing hydrogen was the hydrogenated BCC alloy. Single magnesium powder and magnesium powder+20wt% hydrogenated BCC alloy mixture were ball milled under hydrogen atmosphere for 1 hour. image 3 It is the hydrogen release characteristic curve of magnesium powder and magnesium + BCC alloy after ball milling for 2 hours. It can be seen that the initial hydrogen release temperature of single magnesium powder after ball milling in hydrogen atmosphere is still about 300 ° C, while the hydrogenated BCC alloy modified The initial hydrogen de...

Embodiment 3

[0025] Example 3: The catalyst alloy composition is designed to be Ti-10Mn-15Ni-35V, and the purity of each elemental raw material is above 99.5%. A 50-gram sample is repeatedly smelted 4 times on a high-frequency magnetic levitation melting furnace to ensure that the alloy is uniform . The obtained as-cast alloy was hydrogenated at room temperature under a hydrogen atmosphere of 10 atmospheres for 2 hours. The single magnesium powder and the mixture of magnesium powder+5wt% hydrogenated BCC alloy were ball milled under hydrogen atmosphere for 2 hours. Figure 4 It is a scanning electron microscope picture of magnesium+BCC alloy after ball milling for 2 hours. It can be seen that after ball milling, BCC alloy is evenly distributed on the surface of magnesium, and the average particle size is less than 1 micron. Figure 5 The PCT results showed that the Mg-based alloy showed good PCT properties at 230 °C, 250 °C and 280 °C.

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Abstract

The present invention relates to a high-activity magnesium-based hydrogen storage material through surface catalysis and its preparing method, being characterized in that said hydrogen storage material consists of magnesium metal and a catalyzer which is used for surface catalysis and is a Ti-V based alloy having a general formula of Ti100-x-y-zVxMnyMz, wherein 15<=x<=50, 5<=y<=50, 0<=z<=50, M is at least Cr, Fe, Ni or one or two rare-earth elements, the mass percentage of the katalyst used is 5%-50%. The used catalyzer is in as-cast or hydrogenization state and is prepared by mixing magnesium metal and Ti-V based alloy for catalyzer together and then ball-milling the mixture for 0.5-5 hours under hydrogen atmosphere of 1-50 atmosphere pressures. The maximal oxygen intake of said prepared magnesium-based hydrogen storage material can reach 6.5% at normal temperature and at temperatures lower than 200 DEG C.

Description

technical field [0001] The invention relates to a surface-catalyzed high-activity magnesium-based hydrogen storage material. The alloy has good activation performance and high hydrogen storage capacity, and is an ideal material for storage and transportation of hydrogen and hydrogen storage bottles for fuel cells. . Background technique [0002] Metal hydride hydrogen storage is an important means of hydrogen storage. The principle is to realize the storage and release of hydrogen through the reversible reaction between hydrogen gas and hydrogen storage alloy, that is, when heat is transferred from the outside to the metal hydride, it decomposes into a hydrogen storage alloy and releases hydrogen gas, otherwise, hydrogen and storage When hydrogen alloys form hydrides, the hydrogen is stored in a solid bound form. Using hydrogen storage materials to store and transport hydrogen has the following characteristics: [0003] (1) High volume hydrogen storage density [0004] (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00B01J21/00B01J23/20B22F9/04
Inventor 余学斌吴铸陈秋荣李志林黄铁生
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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