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Li-B-N-H hydrogen source material and preparation thereof

A hydrogen source and oxide technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems affecting applications, poor kinetic performance, high working temperature of hydrogen desorption, etc., and achieve easy control, excellent performance, The effect of low working temperature for hydrogen release

Inactive Publication Date: 2009-01-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently developed Li-B-N-H materials generally have high dehydrogenation temperature and poor kinetic properties, which seriously affect their practical applications.

Method used

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  • Li-B-N-H hydrogen source material and preparation thereof
  • Li-B-N-H hydrogen source material and preparation thereof
  • Li-B-N-H hydrogen source material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In a glove box filled with Ar gas, the molar ratios of 1:1 and 1:1.05 LiBH 4 and LiNH 2 Respectively with 5-20mol% CoO, Co 2 o 3 and Co 3 o 4 Mix, put into a sealable stainless steel tank, use argon protection, and carry out ball milling on a planetary ball mill with a ball-to-material ratio of 50:1 and a rotational speed of 400 rpm. The hydrogen desorption performance test shows that the hydrogen desorption capacity of all samples is above 7wt%, and the dehydrogenation starting temperature is around 80-120°C. figure 1 LiBH shown 4 -LiNH 2 Hydrogen desorption curve of -15mol% CoO sample with temperature. It can be seen from the figure that the initial hydrogen release temperature of the sample is about 100°C. As the temperature rises, the amount of hydrogen released gradually increases. Can reach 8wt%.

Embodiment 2

[0021] filled with N 2 In a gas glove box, LiBH with a molar ratio of 1:2 4 and LiNH 2 Respectively with 10-30mol% Co 2 o 3 Mix, put into a stainless steel tank that can be sealed, use nitrogen protection, and carry out ball milling on a vibrating ball mill with a ball-to-material ratio of 30:1. The obtained samples were tested for dehydrogenation, and the results showed that the dehydrogenation start temperature of all samples was in the range of 120-150° C., and the hydrogen desorption amount was higher than 8wt%. figure 2 LiBH is shown 4 -2LiNH 2 -20mol%Co 2 o 3 The hydrogen desorption curve of the sample. It can be seen from the figure that the initial hydrogen desorption temperature of the sample is about 100°C, and the hydrogen release amount reaches about 8.5wt% at about 210°C.

Embodiment 3

[0023] In a glove box filled with Ar gas, LiBH with a molar ratio of 1:3 4 and LiNH 2 Respectively with 10-50mol% Co 3 o 4 Mix and put into a ball mill jar with a switch valve, after pre-evacuating the ball mill jar, perform ball milling and mixing on a planetary ball mill with a ball-to-material ratio of 80:1 and a rotating speed of 500rpm. The hydrogen desorption kinetics of the samples were tested, and it was found that all the samples achieved full dehydrogenation in the range of 100-180°C, and the hydrogen desorption amount was 6-10wt%. image 3 LiBH shown 4 -3LiNH 2 -25mol%Co 3 o 4 Hydrogen desorption kinetic curve of the sample at 150°C. Obviously, the amount of hydrogen released by the sample can reach more than 7wt% within 200 minutes.

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PUM

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Abstract

The invention discloses a Li-B-N-H hydrogen source material and a method for preparing the same. The Li-B-N-H hydrogen source material is LixBNyHz containing Co oxide, wherein x is more than or equal to 2 and less than or equal to 4, y is more than or equal to 1 and less than equal to 3 and z is more than or equal to 6 and less than equal to 10; under the condition of air insulation, a mixture formed by LiBH4, LiNH2 and Co oxides or LiBH4, LiH and Co oxides is placed in a stainless steel cylinder provided with grinding balls; by adopting the mechanical ball grinding mode and under the vacuum atmosphere, the inert atmosphere or the ammonia atmosphere, LiBH4, LiNH2 and Co oxides or LiBH4, LiH and Co oxides are evenly mixed, the mass ratio of the grinding ball and the sample is between 30 and 100:1, and the rotary speed is between 100 and 550rpm. The Li-B-N-H material of the invention has the advantages of high hydrogen content, low hydrogen-releasing temperature and quick hydrogen-releasing speed, and is the hydrogen source material with perfect performance.

Description

technical field [0001] The invention relates to a hydrogen source material, in particular to a novel Li-B-N-H hydrogen source material and a preparation method thereof. Background technique [0002] With the consumption of non-renewable energy such as oil and natural gas, and the rising price of crude oil, people's demand for efficient and clean energy is increasing. As a clean and environmentally friendly new energy, hydrogen energy has attracted widespread attention due to its many excellent properties. Especially in recent years, the development of vehicle-mounted fuel cell vehicle industry has increasingly promoted the research on new high-capacity hydrogen source materials. [0003] In recent years, the discovery of light metal nitrogen hydride hydrogen storage materials has created a new field of new high-capacity hydrogen storage materials [P.Chen, Z.T.Xiong, J.Z.Luo, J.Y.Lin, K.L.Tan, Nature, 2002, 420: 302.] . On the basis of the Li-N-H system, Li-Mg-N-H, Li-Al-N...

Claims

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Application Information

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IPC IPC(8): C01B35/00
Inventor 潘洪革刘永锋骆昆高明霞
Owner ZHEJIANG UNIV