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Magnesium hydride hydrogen storage composite material containing porous material and preparation method thereof

A technology of porous materials and composite materials, applied in the field of magnesium hydride hydrogen storage composite materials and their preparation, can solve the problems of slow hydrogen absorption and desorption, high temperature, poor reaction kinetic performance, etc., and achieves improved mechanical strength, easy handling, The effect of increasing hydrogen storage density

Pending Publication Date: 2020-04-10
世能氢电科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium and its alloys also have three disadvantages: 1. The hydrogen absorption and desorption rate is slow, and the reaction kinetics are poor; 2. The hydride is relatively stable, and the hydrogen release requires a high temperature; 3. The surface of magnesium and its alloys It is easy to form a dense oxide film, and these shortcomings seriously hinder the practical application of magnesium-based metal hydrogen storage materials.
Due to conventional preparation methods, it is difficult to further reduce the particle size of magnesium-based hydrogen storage materials. The development of magnesium-based materials with real physical effects of nanomaterials is the key to the preparation of magnesium-based metal hydrogen storage materials with good hydrogen storage performance.

Method used

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  • Magnesium hydride hydrogen storage composite material containing porous material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The magnesium hydride hydrogen storage composite material containing porous material comprises the following steps:

[0030] In a sealed mixer (located in a glove box under controlled atmosphere), 47.5 g of activated magnesium hydride powder with an average grain size of 4.0 μm was mixed with 35 g of expanded natural graphite with an average grain size of 6.0 μm (ENG ) for mixing.

[0031] The powder mixture is then poured into molds in a hardened steel pelletizer, also located in the glove box. The granulator is taken out from the glove box in the airtight bag and placed under the press.

[0032] The passing strength is 1t / cm 2 (10 8 Pa) uniaxial compression to compress the powder in the granulator, that is.

Embodiment 2

[0034] The magnesium hydride hydrogen storage composite material containing porous material comprises the following steps:

[0035] In a sealed mixer (glove box under controlled atmosphere), 45 g of activated magnesium hydride powder with an average grain size of 7.0 μm was mixed with 45 g of activated alumina with an average grain size of 20 μm.

[0036] The powder mixture is then poured into molds in a hardened steel pelletizer, also located in the glove box. The granulator is taken out from the glove box in the airtight bag and placed under the press.

[0037] The passing strength is 1t / cm 2 (10 8 Pa) uniaxial compression to compress the powder in the granulator, that is.

Embodiment 3

[0039] The magnesium hydride hydrogen storage composite material containing porous material comprises the following steps:

[0040] In a sealed mixer (glove box under controlled atmosphere), 45 g of activated magnesium hydride powder with an average grain size of 3.5 μm were mixed with 100 g of silica with an average grain size of 30 μm.

[0041] The powder mixture is then poured into molds in a hardened steel pelletizer, also located in the glove box. The granulator is taken out from the glove box in the airtight bag and placed under the press.

[0042] The passing strength is 1t / cm 2 (10 8 Pa) uniaxial compression to compress the powder in the granulator, that is.

[0043] Examples 1-3 recovered compressed material with a diameter of 8 cm, and the material could be processed in an open environment for several minutes. However, it is preferable to store the composite material under a controlled atmosphere to avoid the risk of temperature rise and surface oxidation.

[00...

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Abstract

The invention belongs to the technical field of inorganic porous materials, and particularly relates to a magnesium hydride hydrogen storage composite material containing a porous material and a preparation method thereof. The magnesium hydride hydrogen storage composite material containing the porous material is formed by compounding magnesium hydride and the porous material, the weight ratio ofthe magnesium hydride to the porous material is (0.1-1.2): 1, the porous material is one or more of graphite, SiO2 or Al2O3, and The method comprises the following steps: mixing the magnesium hydridewith the porous material; and compressing the mixture to form the magnesium hydride hydrogen storage composite material. According to the invention, the porous material with adjustable aperture is used as a carrier, so that the hydrogen storage performance of magnesium hydride is combined with excellent pore channels, high specific surface area and the like of the porous material, and the hydrogenstorage material has good characteristics in the aspects of hydrogen adsorption and desorption kinetics. The hydrogen storage material is compositely formed in a compression mode, the hydrogen storage density per unit volume can be improved, and the mechanical strength is improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic porous materials, and in particular relates to a magnesium hydride hydrogen storage composite material containing porous materials and a preparation method thereof. Background technique [0002] Magnesium-based metal hydrogen storage materials have been considered as ideal hydrogen storage materials because of their large hydrogen storage capacity, light weight, cheap price and abundant resources. However, magnesium and its alloys also have three disadvantages: 1. The hydrogen absorption and desorption rate is slow, and the reaction kinetics are poor; 2. The hydride is relatively stable, and the hydrogen release requires a high temperature; 3. The surface of magnesium and its alloys It is easy to form a dense oxide film, and these shortcomings seriously hinder the practical application of magnesium-based metal hydrogen storage materials. [0003] To this end, scientists from various countries h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00
CPCC01B3/0084Y02E60/32
Inventor 王鸣付强张方于如军官凤钢陈艳艳杨昆吕俊囡杨列宁赵增殿夏先畅郝晓明
Owner 世能氢电科技有限公司
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