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Novel Mg-Li-Al-Ti hydrogen storage material and preparing method thereof

A hydrogen storage material and a new type of technology, applied in the production of hydrogen, etc., can solve the problems of high requirements for hydrogen absorption conditions, great influence of dehydrogenation temperature, unstable catalytic performance of catalysts, etc., and achieve reduced reversible hydrogen absorption conditions and high capacity Hydrogen storage performance and the effect of improving kinetic performance

Inactive Publication Date: 2015-06-17
GUILIN UNIV OF ELECTRONIC TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle kinetic performance and high dehydrogenation temperature of hydrogen storage materials have not been greatly improved. The requirements for hydrogen absorption conditions are high, and the amount of hydrogen absorption is small and the time is long. It is still a big problem to be solved.
In addition, the unstable catalytic performance of the catalyst also has a great influence on the dehydrogenation temperature.

Method used

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  • Novel Mg-Li-Al-Ti hydrogen storage material and preparing method thereof
  • Novel Mg-Li-Al-Ti hydrogen storage material and preparing method thereof
  • Novel Mg-Li-Al-Ti hydrogen storage material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation method of a novel Mg-Li-Al-Ti hydrogen storage material, comprising the steps of:

[0016] Step 1, take 0.8855g LiH and 2.1149gLiAlH 4 , put into a ball mill jar with 24 steel balls, and use mechanical ball milling method to mix evenly. Under the condition of inert gas, the rotating speed is 270rpm, and the ball milling time is 8h. After ball milling, it was taken out in the glove box to obtain Li 3 H 6 ;

[0017] Step 2, take samples according to the compositions in Table 1, put them into ball milling jars equipped with 24 steel balls, and mix them evenly by mechanical ball milling. Under inert gas conditions, the rotating speed is 270rpm, and the ball milling time is 2h, and the samples are obtained a (66.2wt.% MgH 2 -33.8wt.% Li 3 H 6 ), b (58.8 wt.% MgH 2 -27.2 wt.% Li 3 H 6 -8 wt.% AlCl 3 -6 wt.% Ti) and c (53 wt.% MgH 2 -27 wt.% Li 3 H 6 - 14 wt.% AlCl 3 -6 wt.% Ti).

[0018] Table 1 Composition of three samples

[0019]

[0020] P...

Embodiment 2

[0022] According to the composition of sample c, under the condition of other conditions unchanged, only change the ball milling time (1 h, 4 h and 5 h), prepare three composite systems with different ball milling time, and investigate the effect of ball milling time on the hydrogen production performance of the system influences.

[0023] From figure 2It can be seen from the dehydrogenation curves that the initial dehydrogenation temperature of ball milling for 1 h and 5 h is about 100 °C, but when the ball milling time is 4 h, the initial dehydrogenation temperature drops to about 58 °C, which is higher than that of 1 h and 5 h The initial dehydrogenation temperature of the composite system decreased by nearly 40 °C; and the total dehydrogenation amount (heated to 400 °C) was the largest when ball milled for 4 h, reaching 7.2 wt.%. The results show that the dehydrogenation amount will be reduced if the ball milling time is too long or too short.

Embodiment 3

[0025] According to the composition of sample c, the ball milling time is 4 h. Under the condition of other conditions unchanged, only the ball-to-material ratio in the ball milling condition is changed [100:1 (sample Ⅰ), 200:1 (sample Ⅱ), 250:1 (Sample Ⅲ)] to investigate the effect of ball-to-material ratio on the hydrogen production performance of the system.

[0026] From image 3 It can be seen from the dehydrogenation curves that the increase of the ball-to-material ratio has little effect on the initial dehydrogenation temperature (the initial dehydrogenation temperatures of samples I, II, and III are all around 58°C), but for the total dehydrogenation temperature of 400°C Quantity matters. It can be seen from the figure that when the ball-to-material ratio is 100:1, the total dehydrogenation amount is 5.2wt.%; when the ball-to-material ratio is increased to 200:1, the total dehydrogenation amount increases to 7.2wt.%. Continue to increase the ball-to-material ratio Wh...

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Abstract

The invention relates to a novel Mg-Li-Al-Ti hydrogen storage material using metal and metal hallide as catalysts and a preparing method of the novel Mg-Li-Al-Ti hydrogen storage material. The main components of the hydrogen storage material are mMgH2, Li3AlH6, x% of Al / AlCl3 and y% of Ti / TiF3 (wherein x and y refer to mass percentages that the substances occupy the total mass, x is larger than 5 and smaller than 20, y is large than 5 and smaller than 15, and m is larger than 2 and smaller than 5). The preparing method comprises the following steps: filling hydride Li3AlH6 of MgH2 and Li-Al and a certain quantity of Al / AlCl3, Ti / TiF3 and the like into a stainless steel tank, and ball-milling under the condition of inert gas for 1-6 hours in a mode of mechanical ball-milling to obtain the Mg-Li-Al-Ti hydrogen storage material. The Mg-Li-Al-Ti hydrogen storage material has the advantages that an Al3Ti catalyst can be generated in situ under the condition of mechanical mixing through adding x% of Al / AlCl3 and y% of Ti / TiF3; 2, the hydrogen absorbing temperature is low, the initial hydrogen release temperature can be lowered to 58 DEG C, 5.6wt% of hydrogen gas can be released at 250 DEG C, and the total dehydrogenation quantity reaches 7.2wt% when the temperature is raised to 400 DEG C; 3, the hydrogen absorbing speed is high, the invertibility is great, and the hydrogen storage material with excellent performance can be used for storing and transporting hydrogen; 4, the raw materials are easy to acquire, and the cost is low.

Description

technical field [0001] The invention relates to a hydrogen storage material, in particular to a novel Mg-Li-Al-Ti hydrogen storage material and a preparation method thereof. Background technique [0002] With the limited consumption of oil and a series of problems caused by environmental pollution, finding a clean and green energy has become a concern, and hydrogen energy has attracted much attention as a clean secondary energy. Hydrogen production, hydrogen storage and hydrogen transportation are the main issues restricting the development of hydrogen energy. Hydrogen storage technology is the key to the practical and large-scale utilization of hydrogen energy. In particular, the research and development of hydrogen storage materials is an important link in the development of hydrogen storage technology. . Magnesium-based hydrogen storage materials are considered to be one of the most promising hydrogen storage materials due to the advantages of large hydrogen storage capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 徐芬于芳孙立贤张祥飞李志宝张焕芝
Owner GUILIN UNIV OF ELECTRONIC TECH
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