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High-volume composite hydrogen storage material, and synthetic method and hydrogen desorption method thereof

A hydrogen storage material and high-capacity technology, applied in chemical instruments and methods, hydrogen, hydrogen production, etc., can solve the problems of high hydrogen depletion temperature, unfavorable practical application of materials, slow hydrogen desorption kinetics, etc., and achieve simple synthesis process Effect

Inactive Publication Date: 2013-03-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only that, borohydride will be accompanied by a gaseous hydride (B 2 h 6 ) release, which is not conducive to the practical application of this material
In recent years, scholars at home and abroad have used LiNH 2 , MgH 2 , CaH 2 and other substances to chemically modify it in order to achieve good results, but these methods still face the problems of slow hydrogen desorption kinetics and high dehydrogenation temperature.

Method used

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  • High-volume composite hydrogen storage material, and synthetic method and hydrogen desorption method thereof
  • High-volume composite hydrogen storage material, and synthetic method and hydrogen desorption method thereof
  • High-volume composite hydrogen storage material, and synthetic method and hydrogen desorption method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. LiBH 4 -NH 2 NH 2 Preparation of complex

[0039] Weigh 361.8 mg of lithium borohydride and 0.5 ml of hydrazine in the glove box, and put the two samples into the same ball mill jar. Note that the two samples cannot be in contact at this time. After the ball mill jar was sealed, it was carefully transferred to a ball mill, and ball milled for 2 hours at 150 rpm. After the ball milling, the pressure in the ball milling tank did not change, and the prepared sample was solid. figure 1 For the X-ray diffraction (XRD) spectrogram of the prepared sample, it can be seen that, with pure LiBH 4 Compared to LiBH 4 -NH 2 NH 2 The complex forms a new species, completely different from LiBH 4 .

[0040] 2. Addition of catalyst

[0041] Weigh 500mg of LiBH in the glove box 4 -NH 2 NH 2 complex, while weighing 77.6mg of FeCl 3 , put the two samples into the same ball mill jar. After sealing the ball mill jar, carefully transfer it to a ball mill, and mill it for 5 h...

Embodiment 2

[0045] 1. Mg(BH 4 ) 2 -2NH 2 NH 2 Preparation of complex

[0046] Weigh 444.1mg of homemade Mg (BH 4 ) 2 , and measure 0.5ml of hydrazine at the same time, put the two samples into image 3 in the airtight container shown in , without touching each other. Using the vapor pressure of hydrazine, Mg(BH 4 ) 2 Hydrazine can be completely adsorbed into the solid phase to form Mg(BH 4 ) 2 -2NH 2 NH 2 Complex. Sample Mg(BH 4 ) 2 -2NH 2 NH 2 Must be aged in a closed system for 1 week.

[0047] 2. Dehydrogenation reaction

[0048] Weigh Mg(BH 4 ) 2 -2NH 2 NH 2 100 mg of the sample was placed in a closed reaction tube, starting from room temperature, the temperature was programmed to rise to 250°C at 2°C / min, and the temperature was kept at 250°C until the end of the reaction. Such as Figure 4 As shown, the measured hydrogen release amount of the system is about 7.6 equiv.H 2 / Mg(BH 4 ) 2 , corresponding to 12.8 wt% H 2 / Mg(BH 4 ) 2 -2NH 2 NH 2 .

Embodiment 3

[0050] LiH-NH 2 NH 2 preparation of

[0051] Weigh 128.9 mg of lithium hydride and 0.5 ml of hydrazine in the glove box, and put the two samples into the same ball mill jar. Note that the two samples cannot be in contact at this time. After the ball mill jar was sealed, it was carefully transferred to a ball mill, and ball milled for 2 hours at 150 rpm. After the ball milling, the gas in the ball mill tank was measured by mass spectrometry to be hydrogen, and the pressure change was 1mol H 2 / LiH, and the prepared sample is solid. Figure 5 For the X-ray diffraction (XRD) spectrogram of the prepared sample, it can be seen that compared with pure LiH, LiH and NH 2 NH 2 The reaction produces a new species, completely different from LiH.

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Abstract

The invention relates to a high-volume composite hydrogen storage material, and a synthetic method and a hydrogen desorption method thereof. The composite hydrogen storage material is synthesized through interacting a substance containing H<delta-> with a substance containing H<delta+>, wherein the ratio of the substance containing H<delta-> to the substance containing H<delta+> is 20:1-1:20. Dehydrogenation is carried out through mainly utilizing a thermal decomposition or catalytic thermal decomposition method, wherein the temperature of the thermal decomposition or the catalytic heat dehydrogenation decomposition is 0-300DEG C, and the application amount of a catalyst is 0.01-20mol%.

Description

technical field [0001] The invention relates to a hydrogen storage material, in particular to a synthesis method and a hydrogen discharge method of a novel composite hydrogen storage material. Background technique [0002] Hydrogen is recognized as one of the ideal alternative energy sources in the future due to its non-polluting, renewable, and high-energy advantages. However, the existing on-board hydrogen storage technology for fuel cell vehicles is difficult to meet the needs of practical applications, and has become one of the bottlenecks restricting the development of hydrogen energy. After years of hard work, great progress has been made in the research and development of hydrogen storage materials, among which borohydride compounds have attracted widespread attention due to their high hydrogen content. For example, lithium borohydride (LiBH 4 ) and magnesium borohydride (Mg(BH 4 ) 2 ) are 18.4wt% and 14.8wt% respectively. However, they are extremely stable at no...

Claims

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Application Information

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IPC IPC(8): C01B3/02
CPCC01B6/21C01B21/16C01B3/02Y02E60/362C01B3/065C01B6/15C01B6/23Y02E60/36
Inventor 陈萍何腾熊智涛吴国涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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