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Hydrogen storage alloy for first stage of two-stage metal hydride hydrogen compressor

A technology of hydrogen compressor and hydrogen storage alloy, which is applied in the field of hydrogen storage alloy, can solve the problems of high compression ratio and poor anti-poisoning ability, and achieve the effect of high compression ratio, easy activation and good dynamic performance

Inactive Publication Date: 2010-08-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

V-series hydrogen storage alloys have a high compression ratio, but poor anti-poisoning ability, and need to work in high-purity hydrogen.

Method used

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  • Hydrogen storage alloy for first stage of two-stage metal hydride hydrogen compressor
  • Hydrogen storage alloy for first stage of two-stage metal hydride hydrogen compressor
  • Hydrogen storage alloy for first stage of two-stage metal hydride hydrogen compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation and testing of hydrogen storage alloy La 0.8 Y 0.2 Ni 4.8 Mn 0.2 . The preparation method, heat treatment conditions and activation method are as described above.

[0032] Test results: The hydrogen storage capacity of the hydride formed at 293K is 5.96, the equilibrium pressure of hydrogen absorption is 189KPa, the equilibrium pressure of hydrogen desorption is 117KPa, and the hysteresis coefficient is 581.26J / mol. The hydrogen absorption kinetic speed is very fast. It takes only 79s to reach 90% of the maximum hydrogen absorption capacity at 4MPa. Easy to activate. The hydrogen absorption and desorption enthalpy changes are -28.52KJ / Mol and 30.81KJ / Mol respectively. The equilibrium pressure of hydrogen absorption and desorption at 368K is 2193KPa and 1645KPa, and the compression ratio is 8.7.

Embodiment 2

[0034] The difference from Example 1 lies in the preparation and testing of hydrogen storage alloy La 0.6 Y 0.4 Ni 4.8 Mn 0.2 .

[0035] Test results: The hydrogen storage capacity of the hydride formed at 293K is 5.92, the equilibrium pressure of hydrogen absorption is 386.3KPa, the equilibrium pressure of hydrogen discharge is 261.2KPa, and the hysteresis coefficient is 953.28J / Mol. The hydrogen absorption kinetic speed is very fast. When the hydrogen pressure is 4MPa, the time required to reach 90% of the maximum hydrogen absorption is 85s. Easy to activate. The hydrogen absorption and desorption enthalpy changes are -27.4KJ / Mol and 28.1KJ / Mol respectively. The equilibrium pressure of hydrogen absorption and desorption at 368K is 2892KPa and 1980KPa, and the compression ratio is 7.6.

Embodiment 3

[0037] The difference from Example 1 lies in the preparation and testing of hydrogen storage alloy La 0.6 Y 0.4 Ni 4.8 Al 0.2 .

[0038] Test results: The hydrogen storage capacity of the hydride formed at 293K is 5.87, the equilibrium pressure of hydrogen absorption is 410.9KPa, the equilibrium pressure of hydrogen desorption is 311KPa, and the hysteresis coefficient is 678.57J / Mol. The hydrogen absorption kinetics is very fast. It only takes 100s to reach 90% of the maximum hydrogen absorption when the pressure is 4MPa. Easy to activate. The hydrogen absorption and desorption enthalpy changes are -26.7KJ / Mol and 27.7KJ / Mol respectively. The equilibrium pressure of hydrogen absorption and desorption at 368K is 3587KPa and 2061KPa, and the compression ratio is 5.1.

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Abstract

The invention relates to a rare-earth series hydrogen storage alloy, namely providing a hydrogen storage alloy La1-a-bYaNdbNicMdM'e used in the first stage of a two-stage metal hydride hydrogen compressor, wherein a is more than or equal to 0 and less than or equal to 0.7, b is more than or equal to 0 and less than or equal to 0.7, c is more than or equal to 4.7 and less than or equal to 4.9, d is more than or equal to 0 and less than or equal to 0.2, e is more than or equal to 0 and less than or equal to 0.2, and d+e is more than or equal to 0.1 and less than or equal to 0.3; M and M' are Zr, Mn or Al, and M and M' are same or different. The alloy is a single CaCu5 type hexagonal structure. The alloy production comprises a process of annealing heat treatment, the condition means that a sample is placed into a quartz tube filled with argon at a temperature of 1,273 kelvin and is annealed for 12 hours, and then is rapidly quenched into the water. The rare-earth series hydrogen storage alloy has simple alloy production method and good comprehensive property, and is quite applicable to the first-stage material of the two-stage metal hydride hydrogen compressor.

Description

Technical field [0001] The invention relates to a rare earth hydrogen storage alloy, and provides a hydrogen storage alloy suitable for the first stage of a two-stage metal hydride hydrogen compressor. To be more precise, the present invention is adopted in LaNi 5 The alloy is added with elements such as Y, Nd, Mn, Al, and Zr to improve the comprehensive hydrogen storage performance of the alloy, so that this material can be used as the first-stage alloy of the two-stage metal hydride hydrogen compressor, and belongs to the hydrogen storage alloy field. Background technique [0002] Energy shortages and environmental pollution caused by the burning of fossil fuels are becoming more and more serious. As a clean and renewable secondary energy source, hydrogen is widely used. However, the storage and transportation of hydrogen energy is still a key issue restricting the development of hydrogen energy. Different hydrogen sources of different purity and pressure are used in differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C1/02C22F1/10
Inventor 李慎兰杜屏周倩青张育森吕曼祺陈德敏杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI