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Composite material for producing hydrogen by hydrolyzing magnesium hydride and preparation method thereof

A composite material and hydrolysis hydrogen production technology, applied in the field of hydrogen storage, can solve the problems of reducing the hydrogen storage mass density of the magnesium hydride hydrolysis hydrogen supply system, unfavorable use of mobile hydrogen fuel cells, and increasing the weight of the system, so as to achieve simple and reliable hydrogen production operation Controlled, adjustable hydrogen release speed, easy to carry

Inactive Publication Date: 2020-05-12
JIANGSU JITRI MOLECULAR ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of external heating increases the components of the hydrogen supply device, increases the weight of the entire system, and reduces the hydrogen storage mass density of the magnesium hydride hydrolysis hydrogen supply system, which is not conducive to the use of mobile hydrogen fuel cells; the second is to increase the weight of the entire system. cost, and reduced portability

Method used

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  • Composite material for producing hydrogen by hydrolyzing magnesium hydride and preparation method thereof
  • Composite material for producing hydrogen by hydrolyzing magnesium hydride and preparation method thereof
  • Composite material for producing hydrogen by hydrolyzing magnesium hydride and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] Weigh 30 grams of magnesium hydride, add 1.5 grams of anhydrous magnesium chloride, place in a high-speed stirrer and mix in a glove box for 1 minute to obtain a hydrolysis hydrogen production composite material.

[0034] Hydrogen release test was carried out on the above-mentioned composite materials, using a peristaltic pump to control the water addition rate and adding tap water, the water addition rate was 6.8mL / min, the hydrogen release rate was stable, the average rate was 1.2L / min, the hydrogen release volume was 47.3L, and the hydrogen release conversion The rate is 92.7% (calculated according to 30g magnesium hydride), and the mass hydrogen storage density is 13.4wt% (hydrogen release mass / total sample mass). figure 1 .

Embodiment 2

[0036] Weigh 30 grams of magnesium hydride, add 6 grams of anhydrous nickel chloride, place in a high-speed stirrer and mix in a glove box for 1 minute to obtain a hydrolysis hydrogen production composite material.

[0037] Hydrogen release test was carried out on the above-mentioned composite materials, using a peristaltic pump to control the water addition rate and adding tap water, the water addition rate was 4mL / min, the hydrogen release rate was stable, the average rate was 0.8L / min, the hydrogen release volume was 43.9L, and the hydrogen release conversion rate is 86% (based on 30g magnesium hydride), and the mass hydrogen storage density is 10.9wt% (dehydrogenation mass / total mass of the sample). The hydrogen desorption curve in the process of hydrogen production by adding water is shown in figure 2 .

Embodiment 3

[0039] Weigh 30 grams of magnesium hydride, add 15 grams of anhydrous calcium chloride, place in a high-speed stirrer and mix in a glove box for 1 minute to obtain a hydrolysis hydrogen production composite material.

[0040] Hydrogen release test was carried out on the above-mentioned composite materials, using a peristaltic pump to control the water addition rate to add tap water, the water addition rates were 0.85mL / min, 1.8mL / / min, 4mL / / min, and the hydrogen release rates were 0.3L / min, 0.44 L / min, 0.8L / min. The relationship curve between the hydrogen desorption rate and the water addition rate in the process of hydrogen production by adding water is shown in image 3 .

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Abstract

The invention belongs to the technical field of hydrogen storage, and particularly relates to a composite material for producing hydrogen by hydrolyzing magnesium hydride and a preparation method of the composite material. The composite material is prepared by mixing magnesium hydride and chloride, and the mass ratio of magnesium hydride to anhydrous chloride is 1: 0.05-0.5. The prepared hydrolysis hydrogen production composite material is convenient to carry and simple and controllable in hydrogen production operation. The adding flow rate of water is adjusted according to the flow requirement of required hydrogen, the hydrogen desorption speed is adjustable and stable, no high-pressure hydrogen is generated during use, and safety and convenience are achieved. The added catalyst anhydrouschlorides such as anhydrous magnesium chloride is dissolved to release heat when water is added to initiate a hydrolysis reaction of magnesium hydride, so that a reaction system is rapidly heated, and hydrolysis of magnesium hydride is promoted; meanwhile, chloride ions generated when chloride is dissolved in water can effectively etch Mg(OH)2 generated by hydrolysis, contact between magnesium hydride and water is promoted, and smooth hydrolysis is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage, and in particular relates to a composite material for hydrogen production by hydrolysis of magnesium hydride and a preparation method thereof. Background technique [0002] In today's increasingly serious energy crisis and environmental pollution problems, the energy transformation of replacing fossil energy with renewable energy is imminent. Hydrogen energy, as a clean and renewable secondary energy source, is considered to be the core pillar in the energy transition. However, the lack of efficient and safe hydrogen storage methods limits the development of hydrogen energy. [0003] In order to meet the application requirements of portable fuel cells, the corresponding in-situ hydrogen supply technology requires raw materials with high hydrogen production capacity, and at the same time, the hydrogen supply needs to be convenient and fast. Magnesium hydride (MgH 2 ) hydrolysis reactio...

Claims

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Application Information

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IPC IPC(8): C01B3/06
CPCC01B3/065Y02E60/36
Inventor 谢镭时雨郑捷李星国
Owner JIANGSU JITRI MOLECULAR ENG INST CO LTD