Fast and energy-saving method and device for preparing Mg2NiH4 hydride

A hydride, fast technology, applied in various metal hydrides, chemical industry, sustainable manufacturing/processing, etc. Effects of rate enhancement, microwave leakage suppression, sample composition uniformity

Inactive Publication Date: 2008-03-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, magnesium-based hydrogen storage alloys are favored for their light weight, high capacity, rich resources, and low price. However, they have high hydrogen desorption temperature, slow hydrogen absorption and desorption speed, and are easy to pulverize and oxidize when used as electrode materials. Short cycle life and other issues, how to effectively solve these problems has always been a research difficulty and hotspot in this field
However, because the activation energy of the reaction cannot be reduced, the synthesis temperature is basically above 527°C, and a long time of heat preservation is required, and the total process time is about several hours.

Method used

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  • Fast and energy-saving method and device for preparing Mg2NiH4 hydride
  • Fast and energy-saving method and device for preparing Mg2NiH4 hydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to the hydrogen storage alloy Mg 2 The amount determined by Ni chemical composition weighs Mg and Ni metal powders, puts them in ethanol after mixing, carries out ultrasonic vibration dispersion to make them fully mixed, and then puts them into a vacuum drying oven for vacuum drying until all organic solvents are completely volatilized; The above mixture was pressed and formed under a pressure of 700MPa, and the pressure was maintained for 10 minutes; the above samples were fixed in a corundum crucible, and the corundum crucible was covered with heat-insulating materials. Place them together in a microwave tube furnace with a frequency of 2.4GHz, evacuate to below 150Pa, and then pass in argon gas with a purity ≥ 99.9% as a protective atmosphere to keep the internal pressure of the crucible at 0.1-0.12MPa; turn on the microwave power supply, and use 100- Heating at a heating rate of 300°C / min. The heating rate fluctuates within the range of 100-300°C / min. Afte...

Embodiment 2

[0033] According to the hydrogen storage alloy Mg 2 The amount determined by the Ni chemical composition weighs Mg and Ni metal powders, mixes them and places them in ethanol, carries out ultrasonic vibration dispersion to make them fully mixed, and then puts them into a vacuum drying oven for vacuum drying; Press and form, keep the pressure for 2 minutes; fix the above sample in a corundum crucible, and wrap the heat insulation material on the outside. Place them together in a microwave tube furnace with a frequency of 2.4GHz, evacuate to below 150Pa, and then pass in argon gas with a purity ≥ 99.9% as a protective atmosphere to keep the internal pressure of the crucible at 0.1-0.12MPa; turn on the microwave power supply, and use 100- Heating at a heating rate of 300°C / min, the heating rate fluctuates within the range of 100-300°C / min, heat up to 506°C and keep warm for 2 minutes, during which the carrier gas is passed until the sample temperature is lower than 300°C, then th...

Embodiment 3

[0035] According to the hydrogen storage alloy Mg 2 The amount determined by the Ni chemical composition weighs Mg and Ni metal powders, mixes them and puts them in ethanol, carries out ultrasonic vibration dispersion to make them fully mixed, and then puts them into a vacuum drying oven for vacuum drying; the above mixture is heated under 400MPa pressure Press and form, keep the pressure for 2 minutes; fix the above sample in a corundum crucible, and wrap the heat insulation material on the outside. Place them together in a microwave tube furnace with a frequency of 2.4GHz, evacuate to below 150Pa, and then pass in argon gas with a purity ≥ 99.9% as a protective atmosphere to keep the internal pressure of the crucible at 0.1-0.12MPa; turn on the microwave power supply, and use 100- Heating at a heating rate of 300°C / min. The heating rate fluctuates within the range of 100-300°C / min. After the temperature is raised to 506°C, it is kept for 30 minutes. During this period, the c...

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Abstract

The present invention is fast energy-saving hydride Mg2NiH4 preparing process and apparatus, and belongs to the field of functional metal material preparing technology. The Mg2NiH4 preparing process includes the following steps: mixing Mg powder and Ni powder based on the chemical composition of Mg2Ni, ultrasonic dispersing, drying and pressure molding; setting the mixture in a corundum crucible, setting in a 1.5-3.5 GHz tubular microwave oven, vacuumizing, introducing protecting gas, heating to 456-556 deg.c at the speed of 100-300 deg / min, maintaining for certain time and cooling to room temperature; crushing, and absorbing and releasing hydrogen for five times to activate and obtain the hydride Mg2NiH4. The process has the advantages of high speed, low power consumption, lowered hydrogen absorbing and releasing temperature of Mg2Ni, and obviously raised dynamic performance of Mg2NiH4.

Description

technical field [0001] The present invention relates to a fast, energy-saving Mg 2 NeH 4 The preparation method and device of hydride belong to the technical field of metal functional materials. Background technique [0002] In the context of increasingly severe global energy and environmental issues, governments of all countries are paying close attention to how to efficiently utilize hydrogen energy, and solving hydrogen energy storage is a key link in its promotion and application. Among them, magnesium-based hydrogen storage alloys are favored for their light weight, high capacity, rich resources, and low price. However, they have high hydrogen desorption temperature, slow hydrogen absorption and desorption speed, and are easy to pulverize and oxidize when used as electrode materials. Short cycle life and other problems, how to effectively solve these problems has always been a research difficulty and hot spot in this field. [0003] Mg 2 Ni, as a representative of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B6/24
CPCY02P20/10
Inventor 刘杨李谦刘静崔晓阳张旭赵云鹤林根文周国治
Owner SHANGHAI UNIV
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