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Metal ammonia borane compound hydrogen storage material and preparation method thereof

A technology of metal ammonia borane and hydrogen storage materials, which is applied in the field of new metal ammonia borane compound hydrogen storage materials and its preparation, and can solve the problems of inability to meet the needs of vehicle-mounted hydrogen storage applications, limited ammonia borane solubility, and low hydrogen storage density. problem, to achieve the effect of low hydrogen release temperature, small heat release, and high hydrogen storage capacity

Inactive Publication Date: 2009-12-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can significantly increase the NH 3 BH 3 The rate of hydrogen release at room temperature is high, but the use of volatile organic solvents restricts its practical application; the hydrogen production by catalytic hydrolysis of ammonia borane has good reaction controllability, but due to the limited solubility of ammonia borane in water, the actual hydrogen storage density of the system is far from It is lower than the practical requirements; using nano-filling method to fill ammonia borane into nano-porous materials can produce "nano-localized effect", which can effectively inhibit the hydrogen desorption temperature of ammonia borane and increase the hydrogen desorption rate Impurity gases are released; but even if the theoretical packing density is reached, the actual capacity loss of the system due to the application of nanoporous materials is still more than 50%
The above analysis shows that none of the existing methods and material systems can meet the needs of on-board hydrogen storage applications

Method used

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  • Metal ammonia borane compound hydrogen storage material and preparation method thereof
  • Metal ammonia borane compound hydrogen storage material and preparation method thereof
  • Metal ammonia borane compound hydrogen storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take NH 3 BH 3 + LiH as the starting material, LiNH was prepared by ball milling method 2 BH 3 Hydrogen storage material.

[0026] The raw material used is: NH 3 BH 3 , LiH (purity 95%, ~200 mesh). In an argon atmosphere glove box, a 1:1 molar ratio of NH 3 BH 3 / LiH mixture and stainless steel balls were put into a stainless steel ball mill jar, sealed with a cover and placed on a Fritsch 7 planetary ball mill for grinding for 2 hours. The ball milling atmosphere is high-purity argon (purity 99.9999%), and the initial pressure is 1 atmosphere. The ball to material mass ratio is 40:1.

[0027] Solid-state nuclear magnetic resonance spectrum testing equipment and conditions: Varian Infinitypulus-400 (9.4T), frequency 128.28MHz; the sample is loaded into a ZrO with a diameter of 4mm in an argon glove box 2 Rotor, the rotor rotation frequency is 12kHz; 11 B chemical shifts in solid NaBH 4 (-41mm) is reference correction; proton decoupling, 3.5μs 90° pulse, 64kH...

Embodiment 2

[0031] Take NH 3 BH 3 +0.5LiH+0.5NaH as the starting material, prepared Li by ball milling method 0.5 Na 0.5 NH 2 BH 3 Hydrogen storage material.

[0032] The raw material used is: NH 3 BH 3 , LiH (purity 95%, ~200 mesh), NaH (purity 95%, ~200 mesh). Raw material molar ratio is NH 3 BH 3 :LiH:NaH=1:0.5:0.5. The ball milling time was 1 hour. The remaining sample preparation conditions are the same as in Example 1.

[0033] The hydrogen release performance of the material was tested by the volumetric method. Figure 4 for Li 0.5 Na 0.5 NH 2 BH 3 The hydrogen desorption kinetic curve. The hydrogen release temperature is 100°C. The test results showed that: Li 0.5 Na 0.5 NH 2 BH 3 Hydrogen was released at 100°C for 4 hours, and the amount of hydrogen released was about 11 wt%.

Embodiment 3

[0035] Take NH 3 BH 3 +0.5MgH 2 As the starting material, Mg was prepared by ball milling method 0.5 NH 2 BH 3 Hydrogen storage material.

[0036] The raw material used is: NH 3 BH 3 , MgH 2 (purity 99%, ~100 mesh). Raw material molar ratio is NH 3 BH 3 : MgH 2 =1:0.5. The ball milling time is 10 hours. The remaining sample preparation conditions are the same as in Example 1.

[0037] The test conditions of solid-state NMR spectrum are the same as in Example 1. Figure 5 gives Mg 0.5 NH 2 BH 3 NMR spectrum of .

[0038] The hydrogen release performance of the material was tested by the volumetric method. Image 6 for Mg 0.5 NH 2 BH 3 The hydrogen desorption kinetic curve. The hydrogen release temperature is 100°C. The test results showed that: Mg 0.5 NH 2 BH 3 Hydrogen was released at 100°C for 4 hours, and the amount of hydrogen released was about 10 wt%.

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Abstract

The invention relates to a material and technology for storing hydrogen, in particular to a novel metal ammonia borane compound hydrogen storage material and a preparation method thereof. The novel metal ammonia borane compound hydrogen storage material is prepared by taking the mixture of ammonia borane NH3BH3 and metal M or metal hydride NHy as an initial raw material and performing ball milling on the raw material in an inert protective atmosphere or a reactive hydrogen atmosphere. The molecular formula of the novel metal ammonia borane compound hydrogen storage material is MxNH(3-nx)BH3, wherein x is more than 0 and less than or equal to 1, and n is more than or equal to 1 and less than or equal to 3. The mole ratio of NH3BH3 to M or NHy in the phase composition of the raw material is 1-50:1. The preparation method provided by the invention has high efficiency and simple and easy operation. The novel metal ammonia borane compound hydrogen storage material provided by the invention has the advantages of high hydrogen storage capacity, low hydrogen production temperature, fast hydrogen production dynamics, no impurities, no gaseous pollutants and the like and has the application prospective of automobile-mounted hydrogen storage.

Description

Technical field [0001] The invention relates to a hydrogen storage material and technology, in particular to a novel metal ammonia borane compound hydrogen storage material and a preparation method thereof. Background technique [0002] Hydrogen is recognized as the most ideal clean energy carrier, with significant advantages such as high gravimetric energy storage density, wide range of sources, recyclable utilization and no negative environmental effects in the process of energy utilization. At present, promoting the application of hydrogen energy has become a prominent focus of the energy strategies of many developed countries. The large-scale commercial application of hydrogen energy involves technical links such as hydrogen production, hydrogen storage / transportation, and hydrogen use. Among them, the hydrogen storage / transportation link is recognized for its comprehensive performance indicators in terms of hydrogen storage density, operating conditions, and safety. It...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B6/10C01B3/06
CPCY02E60/362
Inventor 康向东王平
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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