Method for slow release of hydrogen by use of solid sodium borohydride and crystalline hydrate

A technology of crystalline hydrate and sodium borohydride, which is applied in the field of hydrogen storage and hydrogen production, can solve the problems of poor durability of catalysts, potential safety hazards of hydrogen accumulation, and attenuation of catalyst activity, and meet the requirements of non-polluting products, easy availability of raw materials, and safety requirements Effect

Inactive Publication Date: 2014-11-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to achieve sustained and efficient NaBH 4 Hydrolysis and slow release of hydrogen, for micro-fuel cells to extract hydrogen source, there are still the following problems: (1) the NaBH that has been developed at present 4 The reaction rate of the hydrolysis hydrogen production system is too fast, resulting in safety hazards due to excessive accumulation of hydrogen; (2) limited by NaBH 4 and by-product sodium metaborate (NaBO 2 ) Solubility in water, resulting in a solution based on NaBH 4 The actual effective hydrogen storage density of the hydrolysis hydrogen production system is far lower than its theoretical value, only 1–2wt%; (3) The durability of the catalyst is poor, and the activity of the catalyst decays seriously as the catalytic hydrolysis reaction proceeds

Method used

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  • Method for slow release of hydrogen by use of solid sodium borohydride and crystalline hydrate
  • Method for slow release of hydrogen by use of solid sodium borohydride and crystalline hydrate
  • Method for slow release of hydrogen by use of solid sodium borohydride and crystalline hydrate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Comparison of hydrogen production performance of two kinds of hydrogen production systems in embodiment 1

[0032] Construction of hydrogen production system:

[0033] (1) Solid fuel: 1g NaBH 4 Powder + 0.005g NaOH powder, mix evenly;

[0034] (2) Water source

[0035] (a) 2 g of water;

[0036] (b) 3.36g Na 2 CO 3 10H 2 O powder.

[0037] Hydrogen production method:

[0038] The solid fuel is placed in a closed reaction chamber, and then water or crystal hydrate is added to the reaction chamber to fully contact the reactants.

[0039] The performance of the hydrogen production system was tested by the drainage method, and the hydrogen production performance test results:

[0040] figure 1 gives water and crystalline hydrates (Na 2 CO 3 10H 2 O) is the comparison of the influence of water source on the performance of the hydrogen production system. It can be seen from the figure that water or Na 2 CO 3 10H 2 The reaction started immediately after O was ad...

Embodiment 2

[0042] Embodiment 2 crystal hydrate species to solid NaBH 4 Effect of hydrolysis hydrogen production system on performance

[0043] Construction of hydrogen production system:

[0044] (1) Solid fuel: 1g NaBH 4 powder + 0.005g NaOH powder;

[0045] (2) Crystalline hydrate:

[0046] (a) 3.78g Na 2 SO 4 10H 2 O powder;

[0047] (b) 3.36g Na 2 CO 3 10H 2 O powder;

[0048] (c) 7.28g NaBO 2 4H 2 O powder.

[0049] The hydrogen production method and the hydrogen production performance test method are the same as in Example 1.

[0050] figure 2 gives different crystalline hydrates versus solid NaBH 4 Performance impact of hydrolysis hydrogen production system. It can be seen from the figure that at room temperature, using Na 2 SO 4 10H 2 O, Na 2 CO 3 10H 2 O and NaBO 2 4H 2 The hydrogen production rate of the O system is stable, the hydrogen production yield is higher than 90%, and the corresponding hydrogen storage densities are 4.4wt%, 4.8wt% and 2.5wt%. ...

Embodiment 3

[0051] The content of embodiment 3NaOH is to solid NaBH 4 Effect of hydrolysis hydrogen production system on performance

[0052] The construction of the hydrogen production system, the hydrogen production method and the hydrogen production performance test method are the same as in Example 1.

[0053] Construction of hydrogen production system:

[0054] (1) Solid fuel: 1g NaBH 4 Powder+x g NaOH powder (x=0, 0.005g, 0.01g, 0.02g);

[0055] (2) Crystal hydrate: 3.78g Na 2 SO 4 10H 2 O powder.

[0056] image 3 gives the NaOH content versus solid NaBH 4 Performance impact of hydrolysis hydrogen production system. It can be seen from the figure that the rate of hydrogen production increases with NaBH 4 Decrease with the increase of NaOH content in the powder. The test results show that the solid NaBH can be regulated by changing the content of NaOH powder 4 The hydrogen production rate of the hydrolysis hydrogen production system.

[0057] The result of embodiment sh...

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Abstract

The invention relates to hydrogen storage and hydrogen production technologies, specifically to a method for slow release of hydrogen by a reaction between solid sodium borohydride and a crystalline hydrate. The solid sodium borohydride and the crystalline hydrate react for slow release of hydrogen. Hydrogen production raw materials are completely solids and are composed of two parts, namely a solid fuel and a crystalline hydrate. The weight ratio of the solid fuel to the crystalline hydrate is 1: (3.5-7.3). In the solid fuel, alkali content is 0-2 wt% and the balance is sodium borohydride. A hydrogen production method is as follows: the solid fuel and the crystalline hydrate are mixed so as to release hydrogen. The method requires no catalyst and has advantages of simple operation, low requirement on equipment, high conversion rate of a fuel and the like. By the method, a high-efficient, continuous and stable hydrogen source can be provided for a micro fuel cell.

Description

technical field [0001] The invention relates to hydrogen storage and hydrogen production technology, in particular to a method for slowly releasing hydrogen by reacting solid sodium borohydride and crystalline hydrate. Background technique [0002] The development of efficient hydrogen storage / hydrogen production technology is a key link to promote the large-scale commercial application of hydrogen energy. Compared with high-pressure hydrogen cylinders and cryogenic liquid hydrogen, material-based solid-state hydrogen storage has significant advantages in terms of operational safety, energy efficiency, and theoretical hydrogen storage density, and is recognized as the most promising hydrogen storage method. Solid-state hydrogen storage materials can be divided into two categories: reversible and non-reversible hydrogen storage materials according to the hydrogen charging method, and the latter is also called chemical hydride. Unlike reversible hydrogen storage materials, ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/06
CPCY02E60/36
Inventor 王平戴洪斌庄大为
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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