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A kind of composite hydrogen storage material and preparation method thereof

A technology of hydrogen storage materials and lithium hydride, which is applied in the field of composite hydrogen storage materials and its preparation, can solve the problems of attenuation of hydrogen absorption and desorption, particle size, and dispersion degree of grain size catalysts, etc., to achieve improved hydrogen storage performance, Improved thermodynamic and kinetic properties, low cost effect

Active Publication Date: 2022-06-24
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Add LiBH 4 Catalysts such as metal borohydrides and alkali metal hydrides represented by KH and KH can significantly reduce the initial hydrogen absorption and desorption temperature, but in the process of cyclic hydrogen absorption and desorption, the amount of hydrogen absorption and desorption of the material will be significantly attenuated. The reason is that During the circulation process, the particle size, grain size, and catalyst dispersion degree of the material become worse, etc.

Method used

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  • A kind of composite hydrogen storage material and preparation method thereof
  • A kind of composite hydrogen storage material and preparation method thereof
  • A kind of composite hydrogen storage material and preparation method thereof

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preparation example Construction

[0028] In addition, the present application also provides a method for preparing a composite hydrogen storage material, comprising the following steps.

[0029] Step 1: Weigh magnesium amide, lithium hydride and alkali metal silicon hydride and mix them into a ball mill. Wherein, the molar ratio of magnesium amide to lithium hydride is 1:2, and the addition amount of alkali metal silicon hydride is 1-15 mol %, for example, 1 mol %, 4 mol %, 9 mol %, 15 mol % and the like.

[0030] Preferably, the alkali metal silicon hydride comprises potassium silicon hydride KSiH 3 , Rubidium silicon hydride RbSiH 3 and cesium silicon hydride CsSiH 3 at least one of them.

[0031] In step 2, the ball mill jar is evacuated and filled with hydrogen pressure.

[0032] Preferably, the hydrogen pressure is 2-5 MPa, such as 2 MPa, 3 MPa, 5 MPa and the like.

[0033] Wherein, before the step that the ball mill tank is evacuated and filled with hydrogen pressure, the following steps are also incl...

Embodiment 1

[0043] Samples were weighed in an argon atmosphere glove box with magnesium amide (Mg(NH) 2 ) 2 ), the molar ratio of lithium hydride (LiH) is 1:2, potassium silicon hydride (KSiH) 3 ) powder was added in an amount of 5 mol%. , then put the powder into the ball mill tank, add the grinding material (the ratio of ball to material is 50:1), vacuumize the ball mill tank, then fill it with a hydrogen pressure of 5MPa, and use a planetary ball mill for ball milling treatment (rotation speed 500rpm, ball mill Time 24h, alternately running clockwise and counterclockwise), after the ball milling is completed, take out the hydrogen storage material powder in the glove box to obtain Mg(NH) 2 ) 2 -2LiH-0.05KSiH 3 Composite hydrogen storage materials. Using the same conditions, the components are Mg(NH) 2 ) 2 -2LiH and Mg(NH 2 ) 2 -2LiH-0.05KH material served as a control. to Mg(NH 2 ) 2 -2LiH-0.05KSiH 3 and Mg(NH 2 ) 2 The two samples of -2LiH were tested for hydrogen relea...

Embodiment 2

[0046] Samples were weighed in an argon atmosphere glove box with magnesium amide (Mg(NH) 2 ) 2 ), the molar ratio of lithium hydride (LiH) is 1:2, rubidium silicon hydride (RbSiH) 3 ) powder was added in an amount of 8 mol%. Then put the powder into the ball mill tank, add the grinding material (the ratio of ball to material is 60:1), vacuumize the ball mill tank, then fill in the hydrogen pressure of 4MPa, and carry out the ball milling treatment with a traveling planetary mill (rotation speed 400rpm, ball mill The time is 12h, clockwise and counterclockwise alternately), after the ball milling is completed, the hydrogen storage material powder is taken out in the glove box to obtain Mg(NH) 2 ) 2 -2LiH-0.08RbSiH 3 Hydrogen storage material; under the same conditions, Mg(NH) can be obtained 2 ) 2 The -2LiH material was used as a control. Depend on image 3 It can be seen that Mg(NH 2 ) 2 The -2LiH material begins to absorb hydrogen at about 100 °C, and can only abso...

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Abstract

The invention discloses a composite hydrogen storage material and a preparation method thereof, belonging to the field of hydrogen storage materials. The composite hydrogen storage material includes magnesium amide, lithium hydride and alkali metal silicon hydride, wherein the molar ratio of magnesium amide to lithium hydride is 1:2, and the addition amount of alkali metal silicon hydride is 1-15 mol%. When applying this composite hydrogen storage material, under heating conditions, magnesium amide, lithium hydride and alkali metal silicon hydride react, and alkali metals (such as K, Rb, Cs) and silicon atoms diffuse into the amides, which promotes the formation of amino acids. The cleavage of the N-H bond in the compound improves the thermodynamic and kinetic performance of the hydrogen absorption and desorption reaction. During the hydrogen absorption and dehydrogenation cycle, the alloy formed by alkali metals (K, Rb, Cs) and silicon is continuously pulverized during the hydrogen absorption and dehydrogenation process, so that it can be uniformly dispersed in the Li‑Mg‑N‑H system, thus ensuring The material has extremely good cycle stability. Therefore, the composite hydrogen storage material provided by the present application has a low hydrogen absorption and desorption temperature and extremely excellent low-temperature cycle hydrogen absorption and desorption performance.

Description

technical field [0001] The invention belongs to the technical field of solid-state hydrogen storage, and in particular relates to a composite hydrogen storage material and a preparation method thereof. Background technique [0002] Energy is the basis for human survival, and it is also an important driving force for the rapid development of modern civilization. However, with the continuous expansion of the population and the continuous improvement of people's living standards, people's demand for energy is also increasing. The environmental pollution caused by the extensive use of traditional fossil fuels and the energy depletion caused by their non-renewability force us to seek clean energy. Renewable Energy. Hydrogen energy has attracted worldwide attention due to its wide source, high efficiency and cleanliness, and high energy density. Hydrogen storage technology is an important bottleneck for the large-scale application of hydrogen energy. Among various hydrogen stor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/00
CPCC01B3/0078Y02E60/32
Inventor 李超冯文钦范美强刘凯元蔡明源
Owner CHINA JILIANG UNIV
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