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Composite hydrogen storage material contg. magnesium-transition metals oxides, prepn. method and application thereof

A technology of transition metals and hydrogen storage materials, applied in the fields of alkali metals/alkaline earth metals/beryllium/magnesium hydrides, chemical instruments and methods, and other chemical processes, which can solve the problems of reduced hydrogen absorption, expensive nickel, and increased material costs, etc. problem, achieve the effect of lowering the hydrogen storage temperature

Inactive Publication Date: 2007-01-31
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium has not been used in practice due to its high hydrogen absorption and desorption temperature and poor kinetic properties.
Chinese patent CN1204282C discloses a material with a high hydrogen storage capacity. Although the hydrogen charging and discharging kinetics and thermodynamic performance of pure magnesium hydrogen storage materials have been improved to a certain extent, due to the addition of nickel that does not absorb hydrogen, resulting in Its hydrogen absorption capacity is reduced, and because nickel is relatively expensive, the cost of materials is increased

Method used

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  • Composite hydrogen storage material contg. magnesium-transition metals oxides, prepn. method and application thereof
  • Composite hydrogen storage material contg. magnesium-transition metals oxides, prepn. method and application thereof
  • Composite hydrogen storage material contg. magnesium-transition metals oxides, prepn. method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1: Mg+xmol.%Nb 2 o 5 Preparation and Kinetic Properties of Composite Hydrogen Storage Materials

[0032] Magnesium powder (purity, 99%, 100-200 mesh) and Nb 2 o 5 (purity, 99%, 100-200 mesh) according to Mg+xmol.%Nb 2 o 5(x=0.05, 0.1, 0.2, 0.5, 1, 2) stoichiometric proportioning. Prepared by high-energy ball milling method, the ratio of ball to material is 20:1, the sample tank is evacuated, then filled with hydrogen, repeat 3 times to remove the air in the tank, and finally filled with 0.2MPa high-purity hydrogen. Control the rotating speed to 500r / min, after every 15min rotation, let it stand still for 5min, every 30min of ball milling, fill with hydrogen once to ensure the hydrogen pressure is 0.2MPa, and the desired sample can be obtained after 30h of ball milling. All the above operations were performed in a vacuum glove box. figure 1 Mg+xmol.%Nb 2 o 5 (x=0.2, 1) The X-ray diffraction pattern (XRD) of the composite hydrogen storage material after b...

Embodiment 2

[0034] Embodiment 2: Mg+xmol.%Cr 2 o 3 Preparation and Kinetic Properties of Composite Hydrogen Storage Materials

[0035] The preparation method of the composite material is the same as that of Example 1. Magnesium powder (purity, 99%, 100-200 mesh) and Cr 2 o 3 (purity, 99%, 100-200 mesh) according to x=0.05,0.1,0.2,0.5,1,2 stoichiometric proportioning. Prepared by high-energy ball milling method, the ratio of ball to material is 30:1, the sample tank is evacuated, then filled with hydrogen, repeat 3 times to remove the air in the tank, and finally filled with 0.2MPa high-purity hydrogen. Control the rotation speed to 450r / min, after each rotation for 15min, let it stand still for 5min, and fill it with hydrogen once every 30min of ball milling to ensure that the hydrogen pressure is 0.2MPa, and the desired sample can be obtained after 30h of ball milling. The structure and surface topography of the composite material are also similar to Example 1, that is, the XRD, SEM...

Embodiment 3

[0036] Embodiment 3: Mg+xmol.% Fe 3 o 4 Preparation and Kinetic Properties of Composite Hydrogen Storage Materials

[0037] The preparation method of the composite material is the same as that of Example 1. Magnesium powder (purity, 99%, 100-200 mesh) and Fe 3 o 4 (purity, 99%, 100-200 mesh) according to x=0.05,0.1,0.2,0.5,1,2 stoichiometric proportioning. Prepared by high-energy ball milling method, the ratio of ball to material is 40:1, the sample tank is evacuated, then filled with hydrogen, repeat 3 times to remove the air in the tank, and finally filled with 0.2MPa high-purity hydrogen. Control the rotation speed to 400r / min, after each rotation for 15 minutes, let it stand still for 5 minutes, and fill with hydrogen once every 30 minutes of ball milling to ensure that the hydrogen pressure is 0.2MPa, and the desired sample can be obtained after 30 hours of ball milling. The structure and surface topography of the composite material are also similar to Example 1, tha...

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Abstract

A composite hydrogen-bearing material used for the hydrogen fuel battery is prepared from Mg or magnesium hydride powder and the powdered oxide of transition metal through proportional mixing and high-energy ball grinding in H2 or Ar gas for 10-50 hr.

Description

technical field [0001] The invention relates to a hydrogen storage material, in particular to a magnesium-transition metal oxide composite hydrogen storage material and its preparation method and application. technical background [0002] Energy development and environmental protection have become the strategic core of the sustainable development of human society. The gradual depletion of fossil energy forces people to seek renewable and clean energy. Hydrogen energy is recognized as the most promising secondary energy source in the 21st century due to its cleanliness, high efficiency and renewable energy. At present, fuel cells using hydrogen as fuel have been gradually popularized and applied in practical fields such as automobiles, but their wide application needs to solve three main problems, namely, the economical production of hydrogen, safe storage and transportation, and efficient use. Among them, the safe and efficient storage and transportation of hydrogen is a bo...

Claims

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Application Information

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IPC IPC(8): B01J20/06C01B6/04
Inventor 杨化滨孙洪亮墨伟张燕燕周作祥
Owner NANKAI UNIV
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