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Preparation method of ammonia-containing composite ionic hydrogen storage material

A technology for hydrogen storage materials and composite ions, which is applied in the field of preparation of composite ion hydrogen storage materials, can solve the problems affecting the purity of hydrogen desorption, the effective degassing amount, the kinetics of dehydrogenation at low dehydrogenation temperature, and achieves moderate cost and easy preparation. , to achieve the effect of conversion

Inactive Publication Date: 2011-10-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amide of metal borohydride has a low hydrogen desorption temperature, good dehydrogenation kinetics and certain reversibility, but the release of ammonia during its decomposition process seriously affects its dehydrogenation purity and effective degassing amount

Method used

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  • Preparation method of ammonia-containing composite ionic hydrogen storage material
  • Preparation method of ammonia-containing composite ionic hydrogen storage material
  • Preparation method of ammonia-containing composite ionic hydrogen storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: At room temperature 25°C, 1g LiBH 4 Put it into a Schlenk test tube in argon, vacuumize the test tube, slowly feed ammonia gas, stop feeding ammonia gas when it reaches 0.8atm, and pump the test tube to a vacuum state after 20 minutes of reaction, and continue to vacuum for 3 hours Stop the reaction, take the product out under argon to obtain LiBH 4 ·NH 3 of white crystals. Take 0.78g LiBH in the glove box 4 ·NH 3 with 0.54g Mg(BH 4 ) 2 Mix, put into a ball mill jar, seal and take out the ball mill. The ball milling conditions are: the number of revolutions is 300-350 rpm, with stainless steel ball milling steel balls, the diameter is 0.5-2cm, the ball milling time is 6 hours, the operation mode is alternate pause and restart, the alternate time is 6 minutes, and the pause time is 6 minutes. After ball milling, Mg(BH 4 ) 2 / 2LiBH 4 ·NH 3 Compound, this compound is off-white powder. The results of high-resolution XRD test on the ball-milled sample ...

Embodiment 2

[0039] Example 2: At room temperature 25°C, 1g LiBH 4 Put it into a Schlenk test tube in argon, vacuumize the test tube, slowly feed ammonia gas, stop feeding ammonia gas when it reaches 0.8atm, and pump the test tube to a vacuum state after 20 minutes of reaction, and continue to vacuum for 3 hours Stop the reaction, take the product out under argon to obtain LiBH 4 ·NH 3 of white crystals. Take 0.39g LiBH in the glove box 4 ·NH 3 with 0.54g Mg(BH 4 ) 2 Mix, put into a ball mill jar, seal and take out the ball mill. The ball milling conditions are: the number of revolutions is 300-350 rpm, with stainless steel ball milling steel balls, the diameter is 0.5-2cm, the ball milling time is 6 hours, the operation mode is alternate pause and restart, the alternate time is 6 minutes, and the pause time is 6 minutes. After ball milling, a compound similar to Example 1 is obtained, and Mg(BH 4 ) 2 / LiBH 4 ·NH 3 express. This compound is also an off-white powder, and its hig...

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Abstract

The invention relates to a preparation method of an ammonia-containing composite ionic hydrogen storage material. The structural formula of the hydrogen storage material is Mg (BH4) 2 / n LiBH4.NH3, wherein n has a value range of 1 to 2. The Mg (BH4) 2 / n LiBH4.NH3 system has an excellent hydrogen release performance. The Mg (BH4) 2 / n LiBH4.NH3 system starts to release hydrogen when being heated to a temperature of 100 DEG C and desorbs 10% of hydrogen with a high purity when a temperature is lower than 260 DEG C. A release of ammonia gas is controlled effectively during the above decomposition process thus a conversion of ammonia gas to hydrogen is realized successfully. The Mg (BH4) 2 / n LiBH4.NH3 compound is prepared from magnesium borohydride and lithium borohydride-monoammonium complex according to a mol ratio of (1: 1) to (1: 2) through a mixing process and a simple ball milling process in an inert gas atmosphere. Raw materials of the preparation method are easy to be prepared and the preparation method is simple and is easy to be realized. An Mg (BH4) 2 / n LiBH4.NH3 system prepared by the preparation method can release a mass of hydrogen with a high purity at a low temperature and realizes an effective conversion of ammonia gas to hydrogen. A cost of the preparation method is proper.

Description

technical field [0001] The invention relates to the field of hydrogen storage technology and new material synthesis, in particular to a method for preparing an ammonia-containing composite ion hydrogen storage material. Background technique [0002] With the rapid development of human society, the demand and dependence on energy are increasing day by day. The main energy sources that people rely on at present are: coal, oil and natural gas. The main body of these energy sources are fossil fuels which are non-renewable resources, so various forms of pollution will be generated in the process of their production capacity. Exploration and development are imminent. As an ideal new energy carrier, hydrogen has the advantages of clean and pollution-free, high combustion value, and renewable. Therefore, the construction of a hydrogen energy system to replace existing energy has gradually become a major research hotspot. [1] . [0003] Borohydrides of light metals such as Mg(BH ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02C01B6/23
Inventor 余学斌孙炜伟郭艳辉高粱
Owner FUDAN UNIV
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