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Gasification slag magnesium-nickel alloy hydrogen storage composite material and preparation method thereof

A composite material and gasification slag technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve problems such as high cost, unsuitable application conditions for dissociation temperature and speed, and low reaction rate

Active Publication Date: 2020-11-03
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the hydrogen collection process, the dissociation of hydrogen molecules and the high activation energy of hydrogen atoms entering the interior of magnesium metal through diffusion, magnesium hydride (MgH 2 ) lower reaction rate for nucleation and growth, MgH 2 The high dehydrogenation temperature (>300°C) during the dehydrogenation process and the resulting coarsening of magnesium grains limit the application of metal magnesium for hydrogen storage.
[0004] On this basis, researchers have proposed magnesium alloy hydrogen storage materials, such as magnesium aluminum, magnesium nickel, magnesium palladium, etc. The hydrogen absorption and desorption speed of magnesium alloy hydrogen storage materials is significantly accelerated, and the reaction enthalpy change is reduced. The unique structure and electronic properties have attracted widespread attention and have potential application value. However, the current magnesium alloy hydrogen storage materials themselves still have disadvantages such as high cost, and the dissociation temperature and speed of hydrogen do not meet the actual vehicle application conditions.

Method used

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  • Gasification slag magnesium-nickel alloy hydrogen storage composite material and preparation method thereof
  • Gasification slag magnesium-nickel alloy hydrogen storage composite material and preparation method thereof
  • Gasification slag magnesium-nickel alloy hydrogen storage composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] The raw materials are as shown in Table 1:

[0033] Table 1

[0034] raw material purity(%) Average particle size (μm) Average pore size (μm) mass (g) Magnesium powder 99.8 5 - 850 nickel powder 99.8 4 - 50 Gasification slag 99 80 7 100

[0035] The raw materials in Table 1 were uniformly mixed by ball milling, the ball milling time was 4h, and the mixture A was obtained by ultrasonic vibration, and the mixture A was ultrasonically vibrated for 0.5h, and then the mixture A was pressed into a block B, and B was placed in a graphite crucible ; Put the graphite crucible into the vacuum atmosphere sintering furnace, and the vacuum pressure is 1.0×10 -1 Pa; 0.5MPa inert gas atmosphere, sintering at 550°C for 1h, and after cooling, a gasification slag magnesium-nickel alloy hydrogen storage composite material was obtained.

Embodiment 2

[0037] The raw materials are as shown in Table 2:

[0038] Table 2

[0039] raw material purity(%) Average particle size (μm) Average pore size (μm) mass (g) Magnesium powder 99.8 4 - 800 nickel powder 99.8 3 - 60 Gasification slag 99 100 6 140

[0040] The raw materials in Table 2 were uniformly mixed by ball milling, the ball milling time was 5h, and the mixture A was obtained by ultrasonic vibration, and the mixture A was ultrasonically vibrated for 0.8h, and then the mixture A was pressed into a block B, and B was placed in a graphite crucible ;Put the graphite crucible into the vacuum atmosphere sintering furnace, and vacuum the pressure to 6.0×10 -2 Pa; 0.9MPa inert gas atmosphere, sintering at 575°C for 1.6h, and cooling to obtain gasification slag magnesium-nickel alloy hydrogen storage composite material.

Embodiment 3

[0042] The raw materials are as shown in Table 3:

[0043] table 3

[0044] raw material purity(%) Average particle size (μm) Average pore size (μm) mass (g) Magnesium powder 99.8 3 - 740 nickel powder 99.8 2 - 70 Gasification slag 99 130 5 190

[0045] The raw materials in Table 3 were uniformly mixed by ball milling, the ball milling time was 6 hours, and the mixture A was obtained by ultrasonic vibration, and the mixture A was ultrasonically vibrated for 1 hour, and then the mixture A was pressed into a block B, and B was placed in a graphite crucible; Put the graphite crucible into the vacuum atmosphere sintering furnace, and the vacuum pressure is 5.5×10 -2 Pa; 1.1MPa inert gas atmosphere, sintered at 600°C for 2h, and obtained vaporized slag magnesium-nickel alloy hydrogen storage composite material after cooling.

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Abstract

The invention provides a preparation method of a gasification slag magnesium-nickel alloy hydrogen storage composite material. The method is characterized in that after magnesium powder, nickel powderand gasification slag are mixed, by means of a porous structure of the gasification slag, pore channels of the gasification slag are filled with the magnesium powder and the nickel powder through ball milling, ultrasonic vibration and other modes, and a mixture is uniformly mixed; and then through pressing, sintering and cooling, the gasification slag magnesium-nickel alloy hydrogen storage composite material is prepared. When the composite material is used for hydrogen storage, the porous gasification slag serving as a catalyst is distributed in a magnesium-nickel alloy matrix, so that alloyhydrogenation and hydride dehydrogenation can be promoted, alloy hydrogen collection and hydrogen desorption speed can be increased, and the activation energy of a hydrogen storage system can be reduced; and fine magnesium-nickel alloy particles are distributed in the gasification slag pore channels, so that the growth, caused by heating in a hydrogen desorption process, of the magnesium-nickel alloy particles can be effectively inhibited, and then the hydrogen storage cycle stability of the composite material is maintained. The preparation method is low in cost and wide in raw material source, has the effects of solid waste gasification slag treatment, and reclamation and higher value application of the gasification slag at the same time, and is remarkable in advantage and suitable for popularization.

Description

technical field [0001] The invention relates to the field of hydrogen storage material preparation, in particular to a gasification slag magnesium-nickel alloy hydrogen storage composite material and a preparation method thereof. Background technique [0002] At present, facing the current situation of high environmental pressure, low effective utilization rate of resources and the verge of depletion of fossil fuels, my country's energy future will develop in the direction of energy saving, environmental protection and sustainability. Among many green energy sources, hydrogen, as a renewable energy source, has the advantages of greenness, environmental protection, sustainability and various ways of obtaining it. However, the storage and transportation of hydrogen are the main bottlenecks restricting the development of hydrogen energy. At present, the main hydrogen storage technologies include high-pressure gaseous hydrogen storage, low-temperature liquid hydrogen storage an...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/05B22F3/02B22F3/11B22F9/04C22C1/10C01B3/00
CPCB22F3/02B22F3/101B22F3/11B22F9/04B22F2009/043C01B3/0078C22C1/05C22C23/00Y02E60/32
Inventor 蔡小龙许云华曹保卫刘建勃白靖郭磊刘明欣
Owner YULIN UNIV
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