Catalyzed hydrogen desorption in mg-based hydrogen storage material and methods for production thereof

A technology of hydrogen storage material and magnesium-based hydrogen storage alloy, applied in the field of magnesium-based hydrogen storage materials, can solve the problems of impossible maintenance, short-range order not being preserved, etc.

Inactive Publication Date: 2007-11-14
TEXACO OVONIC HYDROGEN SYST LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0047] The short-range order is not preserved...in fact, when the crystal symmetry is broken, it is impossible to maintain the same short-range order

Method used

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  • Catalyzed hydrogen desorption in mg-based hydrogen storage material and methods for production thereof
  • Catalyzed hydrogen desorption in mg-based hydrogen storage material and methods for production thereof
  • Catalyzed hydrogen desorption in mg-based hydrogen storage material and methods for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Raw materials consisting of pure metal powders magnesium (99.8%, 325 mesh), aluminum (99.5%, 325 mesh), iron (99.9+%, 10 microns) and other minor components were mixed in an agate mortar-pestle. Ten different compositions were prepared, and their weight percentage compositions are shown in Table 1. The mixed powders were pressed into pellets 1 cm in diameter and 1 cm in length using a hardened steel die. The pressed pellets were placed in a quartz tube and sintered under vacuum at a temperature above 500°C for 22 hours.

[0080] Table 1, chemical composition (all figures are percent by weight)

[0081] Alloy Number

Mg

Al

Fe

B

Cu

PD

V

Ni

C

sc

MM-1

88.8

2.7

8.5

-

-

-

-

-

-

-

MM-2

87

3

9

1

-

-

-

-

-

-

MM-3

86

3

9

2

-

-

-

...

Embodiment 2

[0085] Another MM-1 material was prepared by changing the sintering / annealing temperature by the method of Example 1. Figure 6 shows the PCT curves of the samples sintered / annealed at 570°C and 600°C, respectively. While the PCT of the material sintered / annealed at 570°C (sintered / annealed at 500°C) and the PCT of the material of Example 1 showed little deviation, the material sintered / annealed at 600°C provided an extended plateau at slightly higher pressures .

Embodiment 3

[0087] Mechanically alloyed (MA) powders of MM-1 were prepared from a mixture of pure elemental magnesium (99.8%, 325 mesh), aluminum (99.5%, 325 mesh) and iron (99.9+%, 10 microns). Grinding was carried out in an attritor equipped with Cr-steel balls. The mechanical alloying process was carried out under an argon atmosphere with the addition of 1% graphite and heptane to prevent agglomeration of the material on the walls of the attritor. Usually the ball milling time is 2 hours. Figure 7 is a SEM backscattered micrograph of the sample. The figure shows severe phase segregation in the material. Area 1 (bright contrast on the photo) is filled with Fe and Al powders, while area 2 (the darker area in the center) is all magnesium. Figure 8 is the XRD pattern of the sample, showing that this process did not form any amorphous intermetallic products. MA-MM-1 powder was pressed onto an expanded nickel metal substrate, and then coated with 100 Å of iron on both sides as a surface ...

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PUM

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Abstract

A magnesium-based hydrogen storage material including magnesium or a magnesium-based hydrogen storage alloy and a hydrogen desorption catalyst which is insoluble in said magnesium-based hydrogen storage alloy and is in the form of: 1) discrete dispersed regions of catalytic material in the bulk of said magnesium or magnesium-based hydrogen storage alloy; 2) discrete dispersed regions on the surface of particles of said magnesium or magnesium-based hydrogen storage alloy; 3) a continuous or semi-continuous layer of catalytic material on the surface of said magnesium or magnesium-based hydrogen storage alloy which is in bulk or particulate form; or 4) combinations thereof. Methods of producing the material are also disclosed.

Description

technical field [0001] The present invention relates generally to hydrogen storage materials, and more particularly to magnesium-based hydrogen storage materials, wherein hydrogen desorption is catalyzed by a material insoluble in the magnesium-based hydrogen storage materials. The insoluble catalytic material may be in the form of: 1) discretely dispersed catalytic material regions in the hydrogen storage material block; 2) discretely dispersed regions on the surface of hydrogen storage material particles; 3) hydrogen storage in block or granular form A continuous or semi-continuous layer of catalytic material on the surface of the material; or 4) a combination thereof. Background technique [0002] The ever-increasing demand for energy forces experts to recognize the fact that conventional energy sources such as coal, oil or natural gas are not infinite, or at least their costs are increasing all the time, and that it is advisable to replace these conventional sources with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C32/00H01M4/38C22C23/00
CPCB01J37/0244B22F2998/10C22C1/0408C01B3/0031C22C2202/04B01J23/745C01B3/0026Y02E60/327C01B3/0078Y02E60/32C22C1/1084B22F3/02B22F3/10B22F9/04C22C23/00
Inventor M·A·费琴科杨国雄董正忠S·R·奥夫辛斯基
Owner TEXACO OVONIC HYDROGEN SYST LLC
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