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Mg-Mg2Si composite hydrolytic hydrogen production material, preparation method thereof, and method using material to realize hydrolytic hydrogen production

A composite material and composite hydrolysis technology, which is applied in the field of Mg-Mg2Si composite hydrolysis hydrogen production materials and its preparation, can solve the problems of decreased hydrolysis reaction kinetics, low hardness of pure magnesium metal, and difficult hydrolysis performance, so as to improve hydrolysis performance, The effect of high hydrogen production rate, simple production process and equipment

Active Publication Date: 2018-01-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in this hydrolysis technique, as the reaction proceeds, the by-product Mg(OH) 2 A dense passivation layer is formed to cover the surface of unreacted particles, which hinders the further progress of the reaction, resulting in a sharp drop in the kinetics of the hydrolysis reaction
In addition, due to the low hardness and poor ball milling performance of pure magnesium metal, it is difficult to improve its hydrolysis performance by ball milling and other mechanical methods.

Method used

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  • Mg-Mg2Si composite hydrolytic hydrogen production material, preparation method thereof, and method using material to realize hydrolytic hydrogen production
  • Mg-Mg2Si composite hydrolytic hydrogen production material, preparation method thereof, and method using material to realize hydrolytic hydrogen production
  • Mg-Mg2Si composite hydrolytic hydrogen production material, preparation method thereof, and method using material to realize hydrolytic hydrogen production

Examples

Experimental program
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Effect test

Embodiment 1

[0046] In a glove box with 0.1MPa argon atmosphere, the Mg-14wt.%Mg 2 The Si alloy block is initially crushed. After crushing, it is put into a ball mill tank and placed in a high-energy planetary ball mill (QM-3SP4). The ball-to-material ratio is 30:1, the ball mill speed is 350 rpm, and it runs for 15 minutes. Stop for 5 minutes alternately, ball mill in argon atmosphere for 20h; after ball milling, take powder in argon atmosphere glove box, and after passing 200 mesh standard inspection sieve, collect sample powder with fine and uniform particles (Mg- 14wt.%Mg 2 Si composite material).

[0047] The XRD pattern of the sample powder obtained by ball milling is as follows figure 1 As shown by the curve (a) in figure 1 Middle curve (a) shows that except for Mg and Mg in the curve 2 Si diffraction peak, no obvious impurity peak and MgO peak are seen, which proves that the sample powder has few impurities and is not oxidized.

[0048] The SEM secondary electron scanning image of the s...

Embodiment 2

[0055] Take 0.1g of the sample powder prepared in Example 1 (Mg-14wt.%Mg 2 Si composite material) and 30mL MgCl 2 The solution (concentration is 0.5mol / L) is hydrolyzed at room temperature, 40℃, 55℃ and 70℃;

[0056] The hydrolysis reaction is carried out at room temperature, the hydrolysis reaction is mild, 648mL / g of hydrogen is released within 10 minutes, and 766mL / g of hydrogen is released within 30 minutes;

[0057] The hydrolysis reaction is carried out at a temperature of 40°C, and the hydrolysis reaction is mild, with 578mL / g of hydrogen released within 10 minutes, and 827mL / g of hydrogen released within 30 minutes;

[0058] The hydrolysis reaction is carried out at a temperature of 55°C, the hydrolysis reaction is mild, 688mL / g of hydrogen is released within 10 minutes, and 875mL / g of hydrogen is released within 30 minutes;

[0059] The hydrolysis reaction is carried out at a temperature of 70°C, and the hydrolysis reaction is mild, with 877mL / g of hydrogen released within 10 ...

Embodiment 3

[0062] In a glove box with 0.1MPa argon atmosphere, combine Mg powder with Mg 2 After the Si powder is mixed according to the mass ratio of 19:1, it is put into the ball milling tank and placed in the high-energy planetary ball mill (QM-3SP4) with the ball-to-material ratio of 20:1, the ball milling speed is 400 rpm, and running for 15 Minutes and stops for 5 minutes alternately, ball milling in argon atmosphere for 2h; after ball milling, take powder in an argon atmosphere glove box, and after passing through a 200-mesh standard inspection sieve, collect the sample powder with fine and uniform particles (Mg -5wt.%Mg 2 Si composite material).

[0063] The XRD pattern of the sample powder obtained by ball milling is as follows figure 1 As shown in the curve (b) in figure 1 Middle curve (b) shows that except for Mg and Mg in the curve 2 Si diffraction peak, no obvious impurity peak and MgO peak are seen, which proves that the sample powder has few impurities and is not oxidized.

[0...

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Abstract

The invention discloses a Mg-Mg2Si composite hydrolytic hydrogen production material, a preparation method thereof, and a method using the material to realize hydrolytic hydrogen production. Mg2Si accounts for 5-30% of the total mass of a composite material in the Mg-Mg2Si composite hydrolytic hydrogen production material. The Mg-Mg2Si composite hydrolytic hydrogen production material has the advantages of low density, high cost performance, and high unit hydrogen yield. The preparation method of the Mg-Mg2Si composite hydrolytic hydrogen production material is characterized in that the magnesium-silicon alloy composite material containing the above mass percentage of the Mg2Si or a Mg powder and Mg2Si powder mixture is placed in a ball mill and undergoes ball-milling to obtain the Mg-Mg2Si composite hydrolytic hydrogen production material. The method using the composite hydrolytic hydrogen production material to realize hydrolytic hydrogen production is characterized in that the Mg-Mg2Si composite hydrolytic hydrogen production material and an aqueous salt solution are mixed, and undergo a hydrolysis reaction. The hydrogen production method has the advantages of high efficiency, simplicity, no complex devices or processes during the production, high hydrogen production efficiency, and facilitation of industrialization and marketization.

Description

Technical field [0001] The present invention relates to the technical field of hydrogen production by hydrolysis, in particular to a Mg-Mg 2 Si composite hydrolysis hydrogen production material and its preparation method and method for hydrolysis hydrogen production. Background technique [0002] Faced with the increasingly prominent environmental and energy issues and the increasing depletion of non-renewable fuels such as petroleum and coal, the development of high-efficiency renewable energy sources and the realization of long-term sustainable energy development have become a top priority in the world today. In the field of new energy, hydrogen energy, as an environmentally friendly clean energy, has the advantages of high energy density and high heat conversion efficiency, and its combustion product is water, which does not pollute the environment. Therefore, the development and development of hydrogen energy at home and abroad Application is also becoming more and more impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/08B22F1/00B22F9/24
CPCY02E60/36
Inventor 欧阳柳章谭振华刘江文王辉朱敏
Owner SOUTH CHINA UNIV OF TECH
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