Low-temperature reversible hydrogen storage magnesium based composite material

A composite material and hydrogen storage technology, which can be applied in hydrogen separation, using liquid contact hydrogen separation, etc., can solve problems such as limiting the practical application of Mg hydride, reducing hydrogen absorption and desorption temperature, and decreasing hydrogen storage capacity.

Inactive Publication Date: 2006-05-17
ZHEJIANG UNIV
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Problems solved by technology

However due to MgH 2 The formation reaction is slow and the separation temperature is high, which limits the practical application of Mg hydride
The intermetallic compounds that generate Mg effectively reduce the temperature of hydrogen absorption and desorption, but the hydrogen storage capacity also decreases significantly, such as the better performance of Mg 2 The theoretical hydrogen storage capacity of Ni alloy is only 3.6wt.%.

Method used

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Experimental program
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Effect test

Embodiment

[0009] The low-temperature reversible hydrogen storage magnesium-based composite material contains (by weight) 1.5% nano-titanium oxide (TiO 2 ), 1.96% Cr, 8.92% Ni, remaining Mg. Mix Ni powder, Cr powder and part of Mg powder according to the ratio of material composition according to the atomic ratio of 0.8:0.2:2, cold press into a block under the pressure of 500MPa, and then sinter at 500°C in an argon atmosphere to make Mg 2 Ni 0.8 Cr 0.2 alloy. Then the sintered and pulverized Mg 2 Ni 0.8 Cr 0.2 Alloy powder and quantitative nano TiO 2 Mix with the remaining Mg powder evenly by ball milling, and hydrogenate completely at 300°C and 4MPa hydrogen pressure. The hydrogenated powder was put into a stainless steel ball mill tank at a ball-to-material ratio of 20:1, and was subjected to high-energy ball milling in an argon atmosphere for 50 hours to prepare a composite material. Before the first hydrogen absorption and desorption experiment, the composite material sample...

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Abstract

The present invention is a kind of magnesium base composite material, this material contains (weight): 0.5~5.0% nano titanium oxide (TiO 2 ), 1.0 to 3.0% Cr, 5.0 to 15.0% Ni, and remaining Mg. It can reversibly absorb and desorb hydrogen at low temperature, has high hydrogen storage capacity, good activation performance and excellent kinetic performance of hydrogen absorption and desorption. It can be used to manufacture hydrogen sources, facilitate the purification, storage and transportation of hydrogen, and can also be used as hydrogen storage materials for fuel cells.

Description

technical field [0001] The invention belongs to magnesium-based composite materials. Background technique [0002] With the gradual reduction of petroleum resources, hydrogen energy has become an ideal secondary energy due to its advantages of abundant resources and no environmental pollution. The main technical links that constitute the hydrogen energy system include the production, supply, storage, conversion, and use of hydrogen, among which energy storage and conversion have always been the key to the effective use of energy. The traditional method of hydrogen storage mainly uses steel cylinders to store hydrogen. The disadvantage is that the efficiency is low. At the same time, the steel cylinders are required to have the characteristics of high pressure resistance and leakage prevention, and the conditions are relatively strict. The use of metal hydrides to store hydrogen is a safe method with high specific volume storage capacity, which plays an irreplaceable role in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C01B3/52
Inventor 涂江平王秀丽陈长聘
Owner ZHEJIANG UNIV
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