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Improved LiNH2-LiH composite hydrogen storage material and method for improving hydrogen storage properties

A technology for hydrogen storage materials and mixtures, which is applied in chemical instruments and methods, hydrogen and hydrogen production, etc., can solve problems such as insufficiency, and achieve improved hydrogen storage performance, low hydrogen desorption starting temperature, and cyclic hydrogen absorption and desorption. The effect of performance improvement

Inactive Publication Date: 2017-09-22
YANGZHOU UNIV
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AI Technical Summary

Problems solved by technology

LiNH 2 -After LiH is mixed, it can reversibly absorb and desorb hydrogen at 200-300°C. Compared with practical applications, this temperature range is still high and cannot meet the requirements of modern commercial hydrogen storage. In order to improve LiNH 2 - The hydrogen absorption / desorption performance of the LiH system has been studied by adding TiCl to the Li-N-H system 3 , KH, KX (wherein X is F, Cl or Br) compounds, etc. It is found that adding these catalysts has a better catalytic effect on improving the hydrogen absorption / desorption kinetics of the Li-N-H system, which can greatly improve the LiNH 2 -Hydrogen storage performance of LiH system
However, there are not many reports on the simultaneous action of K+, Ti-, and F- ions on a certain hydrogen storage system. 2 TiF 6 To the Li-N-H hydrogen storage system, this study is a study of adding these three ions to the Li-N-H hydrogen storage system at the same time. Through the synergistic effect of the three, it is expected to improve the hydrogen storage performance

Method used

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  • Improved LiNH2-LiH composite hydrogen storage material and method for improving hydrogen storage properties
  • Improved LiNH2-LiH composite hydrogen storage material and method for improving hydrogen storage properties
  • Improved LiNH2-LiH composite hydrogen storage material and method for improving hydrogen storage properties

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Experimental program
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Effect test

Embodiment 1

[0023] 1. Ball milling LiNH 2 Mix the sample with LiH (1:1): In an argon glove box, weigh the LiNH 2 0.3 g of a sample mixed with LiH crystal at a mass ratio of 1:1 was put into a ball mill jar containing 20 stainless steel balls. Take out the ball mill jar, fill it with 0.6MPa hydrogen, and install the ball mill jar symmetrically in a planetary ball mill, and perform ball milling treatment at a speed of 450 rpm for 2 hours.

[0024] 2. LiNH after ball milling 2 - LiH mixed samples for hydrogen thermal desorption test: In an argon glove box, recovery of LiNH after ball milling 2 Mix the sample with LiH, take 13mg LiNH after ball milling 2 - LiH mixed sample, hydrogen desorption test by thermal mass spectrometer, the gas signal is detected as H 2 , the condition is an argon atmosphere (the flow rate is 20ml min -1 ), 50~600℃, the heating rate is 10k / min. Undoped LiNH can be obtained 2 -The onset and peak temperature of hydrogen desorption of LiH system, and the weight lo...

Embodiment 2

[0027] 1. Mix LiNH with a mass ratio of 1:1 2 mixed with LiH first, and then doped with 1mol% K 2 TiF 6 , 3mol%K 2 TiF 6 and 3mol%K 2 TiF 6 get K 2 TiF 6 Doped LiNH 2 and LiH mixed crystals.

[0028] Doping K 2 TiF 6 LiNH 2 Mixed crystals with LiH: In an argon glove box, weigh 0.3g doped K 2 TiF 6 LiNH 2 Mix crystals with LiH into a ball mill jar containing 20 stainless steel balls. Then take out the ball mill jar from the glove box, fill it with 0.6MPa hydrogen, and install the ball mill jar symmetrically in the planetary ball mill, and ball mill it for 2 hours at a speed of 450 rpm.

[0029] 2. Doped with different content of K after ball milling 2 TiF 6 LiNH 2 -LiH mixed samples were tested for hydrogen thermal desorption: In an argon glove box, different amounts of K were recovered after ball milling 2 TiF 6 LiNH 2 - LiH mixed samples, respectively take 13mg ball milled and doped with 1mol%, 3mol% and 5mol% K 2 TiF 6 LiNH 2 - LiH mixed samples were ...

Embodiment 3

[0032] 1. Mix LiNH with a mass ratio of 1:1 2 Mixed with LiH first, then doped with 5mol% TiF4 to obtain LiNH doped with TiF4 2 and LiH mixed crystals.

[0033] LiNH doped with 5mol% TiF4 2 Mixed crystals with LiH: In an argon glove box, weigh 0.3g of LiNH doped with 5mol% TiF4 2 Mix crystals with LiH into a ball mill jar containing 20 stainless steel balls. Then take out the ball mill jar from the glove box, fill it with 0.6MPa hydrogen, and install the ball mill jar symmetrically in the planetary ball mill, and ball mill it for 2 hours at a speed of 450 rpm.

[0034] 2. Hydrogen desorption test for samples after ball milling: In an argon glove box, recover LiNH doped with 5mol% TiF4 after ball milling 2 Mix the sample with LiH, take 13mg of LiNH doped with 5mol% TiF4 after ball milling 2 The mixed sample with LiH was tested for hydrogen desorption by thermal mass spectrometer, and the gas signal was detected as H 2 , the condition is an argon atmosphere (the flow rate ...

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Abstract

Belonging to the technical field of solid state hydrogen storage in hydrogen energy development and utilization, the invention relates to an improved LiNH2-LiH composite hydrogen storage material and a method for improving hydrogen storage properties. The improved LiNH2-LiH composite hydrogen storage material is a K2TiF6 doped LiNH2-LiH composite hydrogen storage material. The alkali metal light metal hydride (LiH-LiNH2) solid state hydrogen storage material has the advantages of high performance and low density. According to the invention, K<+>, Ti<+> and F<-> ions are simultaneously doped into a LiH-LiNH2 mixed system by ball milling effect, so that the dehydrogenation initial temperature of the compound is greatly reduced (by 124DEG C), the compound has obviously improved rate, and the reversible cyclic hydrogen absorption and desorption stability of the composite system is improved. Under the action of the catalyst K2TiF6, the performance of the Li-N-H system is improved. The method provided by the invention is safe and efficient, and further promotes the practical application of hydrogen powered automobiles and fuel cells.

Description

technical field [0001] The invention belongs to the technical field of light alkali metal solid-state chemical hydrogen storage, in particular to LiNH 2 - Exploration and research of high-efficiency catalysts with improved hydrogen storage performance in LiH system. Background technique [0002] In recent years, hydrogen, an environmentally friendly energy that has been widely discussed by people, is regarded as the most promising fuel in the future. However, we still need to solve many problems, especially in hydrogen storage, if we want to turn the utilization of hydrogen energy into reality. Due to the high hazards and low volumetric energy density of hydrogen, conventional high-pressure storage and cryogenic storage are not optimal for practical transportation applications. At present, the emergence of solid-state hydrogen storage technology has improved the current situation. Solid-state hydrogen storage (a chemical hydrogen storage method that uses hydrogen to react ...

Claims

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Application Information

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IPC IPC(8): C01B3/04
CPCC01B3/0078Y02E60/32Y02E60/36
Inventor 滕云雷张亚茹董宝霞
Owner YANGZHOU UNIV
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