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Production of magnesium-based hydrogen-storage material under equalized strong magnetic field and its producer

A technology of hydrogen storage material and strong magnetic field, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of small breakthrough in low temperature hydrogen storage and release performance of magnesium-based alloys, restricting practical applications, etc., to save energy and time, The effect of fast speed and energy saving efficiency

Inactive Publication Date: 2007-01-17
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the above methods, the thermodynamics, kinetic properties, electrochemical properties and cycle life of the material have been improved to varying degrees, but the low-temperature hydrogen storage and desorption performance of magnesium-based alloys has not made much breakthrough, which seriously restricts its practical application. In other words, the current problem facing us is still how to find a low-cost high-performance hydrogen storage alloy technology

Method used

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  • Production of magnesium-based hydrogen-storage material under equalized strong magnetic field and its producer
  • Production of magnesium-based hydrogen-storage material under equalized strong magnetic field and its producer
  • Production of magnesium-based hydrogen-storage material under equalized strong magnetic field and its producer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to hydrogen storage alloy Mg 2 Weigh the metal powders in the amount determined by the Ni chemical composition, mix them and place them in ethanol, perform ultrasonic vibration to disperse them to make them fully mixed, and then dry them naturally; press the above mixture into a shape, maintain the pressure for 10-20 minutes, and then It is mechanically broken into granules smaller than 2mm; the above-mentioned granules are placed in a high-temperature and high-pressure reactor, and the vacuum reaches 2.00×10 -3 After Pa, inert gas or hydrogen with a purity of ≥99.9% is introduced, and the pressure is maintained at 1.0 MPa for 10 minutes. The reaction kettle is placed in a constant-strength magnetic field of 2-14T, slowly heated at a heating rate of 5-20°C / min, heated to 500°C, kept for 180min, and then cooled to room temperature to obtain a hydrogen storage alloy. Mg is prepared under different intensities of applied uniform and constant magnetic fields 2 Ni. Mea...

Embodiment 2

[0030] According to chemical composition Mg 2 Weigh each metal powder with the amount determined by Fe, mix it and place it in acetone, perform high-frequency ultrasonic vibration and dispersion to make it fully mixed, and then dry it naturally; press the above mixture into a shape, hold the pressure for 20 minutes, and then mechanically crush it Into small particles smaller than 2mm; put the above-mentioned crushed particles in an autoclave and vacuum up to 2.00×10 -3 After Pa, inert gas or hydrogen with a purity of ≥99.9% is introduced, and the pressure is maintained at 7.0MPa for 20 minutes. The reaction kettle is placed in a constant-strength magnetic field of 2-5T, slowly heated at a heating rate of 5-20℃ / min, heated to 650℃, kept for 240min, and then cooled to room temperature to obtain a hydrogen storage alloy. Mg can be prepared by adopting the present invention 2 FeH 6 Hydrogen storage materials. figure 2 It is the TG diagram of Mg-Fe-H ternary system materials prepared ...

Embodiment 3

[0034] First, LaNi is made by electric arc furnace smelting 2.5 Binary alloy, crushed to 400 mesh under the protection of argon, vacuum sealed and packaged. Then follow Mg-4mol% LaNi 2.5 The stoichiometric ingredients are mixed and placed in isoacetone. The mixture is fully mixed by high-frequency ultrasonic vibration and dispersion, and then dried naturally; the above-mentioned mixture is pressed into a shape with a pressure holding time of 60min, and then it is mechanically broken into a size less than 2mm Crumbs; put the above crumbs in an autoclave, and vacuum up to 2.00×10 -5 After Pa, inert gas or hydrogen with a purity of ≥99.99% is introduced, and the pressure is maintained at 5.0MPa for 30 minutes. The reaction kettle is placed in a 10T uniformly strong magnetic field, slowly heated at a temperature increase rate of 5-20°C / min, heated to 600°C, held for 300 minutes, and then cooled to room temperature to obtain a magnesium-based composite hydrogen storage alloy. Test its ...

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Abstract

The present invention relates to the preparation process and device of Mg-based hydrogen storage materials in homogeneous high magnetic field. In this process metal powder is mixed as the designed chemical composition, dispersed by ultrasonic, dried, compacted and fragmented; then it is placed in the reaction kettle that is vacuumized and charged with hydrogen; then in homogeneous high magnetic field of 1-14T it is heated to 400-750DEG C slowly and the temperature is preserved, the hydrogen storage alloy is obtained after cooling. The special device in the present invention features that it includes generating system of homogeneous high magnetic field and reaction kettle for high temperature and pressure. This invention decreases the dehydriding temperature of the Mg-based hydrogen storage material while increases its absorbing and releasing rates of hydrogen.

Description

Technical field [0001] The invention relates to a method and a device for preparing magnesium-based hydrogen storage materials under a uniform and constant strong magnetic field, and belongs to the technical field of metal functional materials. Background technique [0002] In the face of energy shortages, environmental pollution, greenhouse effect and many other issues, hydrogen energy has received unprecedented attention today. The development of a generation of clean, efficient, safe and sustainable new energy represented by hydrogen energy is of special significance for the entire world and China's sustainable development. [0003] In the hydrogen energy system, hydrogen storage technology is the key to effective use of hydrogen energy. Metal hydride hydrogen storage has the advantages of high hydrogen storage volume density, good safety, easy operation, low operating cost, and is especially suitable for applications in volume More stringent occasions. Among them, magnesium-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/00C22C1/04C22C23/00B01J20/02
Inventor 李谦周国治林根文鲁雄刚张捷宇徐匡迪
Owner SHANGHAI UNIV
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