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Methods for improving oxidation resistance of Mg(BH4)2 and regulating hydrolysis hydrogen production rate of Mg(BH4)2

A technology of magnesium borohydride and hydrogen production by hydrolysis, applied in chemical instruments and methods, borane/diborane hydride, hydrogen production, etc., can solve the problems of uncontrollable reaction rate, poor oxidation resistance, violent reaction, etc. , to achieve the effect of improving antioxidant capacity, strong antioxidant capacity and high activity

Inactive Publication Date: 2018-10-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] In addition, Mg(BH 4 ) 2 As a hydrogen storage material, its oxidation resistance is poor, and it is easy to react in the air. The conditions for hydrogen production are strict and the cost is high.
Moreover, when magnesium borohydride is hydrolyzed to produce hydrogen, the reaction between magnesium borohydride and water is too violent, and the reaction rate cannot be controlled.

Method used

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  • Methods for improving oxidation resistance of Mg(BH4)2 and regulating hydrolysis hydrogen production rate of Mg(BH4)2
  • Methods for improving oxidation resistance of Mg(BH4)2 and regulating hydrolysis hydrogen production rate of Mg(BH4)2

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Embodiment 1

[0039] In a glove box with an argon atmosphere, take 0.05 g of Mg(BH 4 ) 2 Put it into a flask, and carry out hydrolysis reaction with 10mL pure water at room temperature, the reaction is mild, and the hydrolysis kinetic curve is as follows: figure 1 As shown in (a), 1g of the powder can release 2465mL of hydrogen gas within 1h, and finally can release a total of 3005mL of hydrogen gas. It can be seen that Mg(BH 4 ) 2 It has a very high hydrolysis hydrogen release rate and hydrogen release capacity.

Embodiment 2

[0041] In a glove box with argon atmosphere, take 0.05gMg(BH 4 ) 2 0.5NH 3 Put it into a flask, and carry out hydrolysis reaction with 10mL pure water at room temperature, the reaction is mild, and the hydrolysis kinetic curve is as follows: figure 1 As shown in (b), 1g of the powder can release 1513mL of hydrogen within 1h, and finally a total of 2376mL of hydrogen can be released. Compared to Mg(BH 4 ) 2 For example, Mg(BH 4 ) 2 0.5NH 3 The hydrolysis reaction is more controllable and milder, the hydrolysis rate is slower, and still has a higher hydrogen production.

Embodiment 3

[0043] In a glove box with an argon atmosphere, take 0.05 g of Mg(BH 4 ) 2 ·NH 3 Put it into a flask, and carry out hydrolysis reaction with 10mL pure water at room temperature, the reaction is mild, and the hydrolysis kinetic curve is as follows: figure 1 As shown in (c), 1 g of the powder can release 1249 mL of hydrogen within 1 h, and finally a total of 2029 mL of hydrogen can be released. Compared to Mg(BH 4 ) 2 and Mg(BH 4 ) 2 0.5NH 3 , Mg(BH 4 ) 2 ·NH 3 The hydrolysis reaction is more moderate and controllable, the hydrolysis speed is slower, and a certain amount of hydrogen release is maintained.

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Abstract

The invention belongs to the technical field of hydrolysis hydrogen production and discloses methods for improving oxidation resistance of Mg(BH4)2 and regulating hydrolysis hydrogen production rate of Mg(BH4)2. The method for improving oxidation resistance of Mg(BH4)2 comprises the steps as follows: Mg(BH4)2 is compounded with an ammonia source and a Mg(BH4)2 ammoniate is obtained, so that the oxidation resistance of the Mg(BH4)2 is improved. The method for regulating hydrolysis hydrogen production rate of Mg(BH4)2 comprises the steps as follows: (1) Mg(BH4)2 is compounded with the ammonia source and a Mg(BH4)2 ammoniate is obtained, wherein the general formula of the Mg(BH4)2 ammoniate is Mg(BH4)2.xNH3, and x is larger than or equal to 0.5 and smaller than or equal to 6; (2) the ammoniate reacts with water to produce hydrogen, wherein the hydrolysis rate changes with change of x in the ammoniate, and the hydrogen production rate can be controlled by regulating x in the ammoniate. TheMg(BH4)2 is compounded with the ammonia source, so that the oxidation resistance of the Mg(BH4)2 is improved. Hydrolysis hydrogen production of the ammoniate is performed stably at the room temperature and has no obvious exothermic effect.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by hydrolysis, in particular to a method for increasing magnesium borohydride (Mg(BH 4 ) 2 ) Oxidation resistance and a method for regulating the hydrogen production rate by hydrolysis of magnesium borohydride. Background technique [0002] Energy is an important material basis of the national economy, and the reserves of non-renewable resources such as oil and natural gas that we rely on for survival are limited on the earth, so the development of new energy is the only way to avoid energy crises. In the field of new energy, hydrogen energy is generally considered to be the most ideal pollution-free green energy in the new century, because the product of hydrogen combustion is water, which has no impact on the environment, and the heat released during combustion is high. The development of hydrogen energy can not only meet the sustainable development of social economy, but also incr...

Claims

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Application Information

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IPC IPC(8): C01B3/06C01B6/21
CPCC01B3/065C01B6/21Y02E60/36
Inventor 欧阳柳章王美春韩赟刘江文王辉朱敏
Owner SOUTH CHINA UNIV OF TECH
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