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High-capacity hydrogen-storage material with NaAlH4 and preparation method thereof

A technology of hydrogen storage materials and hydrides, which is applied in the field of high-capacity coordination sodium aluminum hydride hydrogen storage materials and its preparation, can solve the problems of reducing effective hydrogen storage components, consumption of hydrogen storage materials, capacity loss, etc., and achieves low price , simple process, easy to operate

Inactive Publication Date: 2008-02-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only consumes a considerable amount of hydrogen storage material, but also significantly reduces the effective hydrogen storage composition of the material.
As for organic catalysts, in addition to causing capacity loss, there are also disadvantages of hydrocarbon gas pollutants that endanger the application terminal of hydrogen storage systems - proton exchange membrane fuel cells

Method used

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  • High-capacity hydrogen-storage material with NaAlH4 and preparation method thereof
  • High-capacity hydrogen-storage material with NaAlH4 and preparation method thereof
  • High-capacity hydrogen-storage material with NaAlH4 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of Ti-doped NaAlH by Composite Doping KH and Ti Powder Using NaH / Al Powder Mixture as Matrix 4 Hydrogen storage material.

[0031] The raw materials used are: NaH (purity 95%, ~200 mesh), KH (dispersed in mineral oil, 30% by weight), Al powder (purity 99.95+%, ~200 mesh), and Ti powder (purity 99.98%, ~325 mesh). Except for KH, other raw materials were used directly without treatment. KH was extracted from mineral oil with pentane in an argon atmosphere glove box. After several pentane washes and filtration, the pentane was vacuum removed to obtain pure KH. Put the raw material mixture with a molar ratio of 0.96NaH+Al+0.04Ti+0.04KH into a stainless steel ball mill jar, and grind it on a Fritsch7 planetary ball mill for 10 hours. The ball milling atmosphere is high-purity hydrogen (purity 99.999%), and the initial pressure is about 8 atmospheres. The ball-to-material ratio is 40:1.

[0032] The hydrogen absorption and desorption properties of the materia...

Embodiment 2

[0036] NaAlH Prepared by Composite Doping KH and Ni Powder Based on NaH / Al Powder Mixture 4 Hydrogen storage material.

[0037] Ni powder (purity 99.99%, ~100 mesh) in the raw material is used, NaH, Al powder and KH are the same as embodiment 1. The starting materials with a molar ratio of 0.95NaH+Al+0.05Ni+0.05KH were put into a stainless steel ball mill jar and ground on a Fritsch 7 planetary ball mill for 20 hours. The ball milling atmosphere is high-purity argon (purity 99.999%), and the initial pressure is 1 atmosphere. The ball-to-material ratio is 60:1.

[0038] As shown in Figure 3: in the second cycle, the material released hydrogen at 150°C for 14 hours, and the amount of hydrogen released could reach 3.8wt.%; it took about 15 hours to absorb hydrogen at 120°C. The material has stable hydrogen capacity and dynamic performance in the hydrogen absorption and desorption cycle.

Embodiment 3

[0040] Composite doping of CaH with NaH / Al powder mixture as matrix 2 Preparation of Ti-doped NaAlH with Ti powder 4 Hydrogen storage material.

[0041] Using MgH in the raw material 2(purity 95%,~40 orders), NaH, Al powder and Ti powder are the same as embodiment 1. The molar ratio will be 0.96NaH+Al+0.04Ti+0.02MgH 2 Proportioned starting materials were placed in a stainless steel ball mill jar and ground on a Fritsch 7 planetary ball mill for 10 hours. The ball milling atmosphere is high-purity hydrogen (purity 99.999%), and the initial pressure is 10 atmospheres. The ball-to-material ratio is 50:1.

[0042] As shown in Figure 4: in the third cycle, the material released hydrogen at 150°C for 15 hours, and the amount of hydrogen released could reach 4.0wt.%; it took about 20 hours to absorb hydrogen at 120°C. The material has stable hydrogen capacity and dynamic performance in the hydrogen absorption and desorption cycle.

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Abstract

The invention relates to an improvement on the hydrogen storage material, especially providing a high-capacity coordinated sodium aluminum hydride storage material which is impure with transition metal. Said hydrogen system is formed by basic material, catalyst, and auxiliary structure. In the doping process, it directly uses transition metal as catalyst, and adding alkali metal / alkali hydride or alkaline earth metal / alkaline earth hydride as auxiliary structure at the same time; and processing ball grinding under inertia gas protection or reactive hydrogen gas. The invention has the advantages that: the method is simple, with easy operation and lower cost, while it can solve the problems of traditional techniques which will generate inertia by-product and foreign gas; and provided system has high capacity of hydrogen and high cycle stability. The actual hydrogen capacity can reach 4.7wt% in some system which is increased 40% than present ones.

Description

technical field [0001] The invention relates to an improvement technology of a hydrogen storage material, in particular to a high-capacity coordination sodium aluminum hydride hydrogen storage material doped with a transition metal and a preparation method thereof. Background technique [0002] The development of high-performance hydrogen storage systems to provide hydrogen sources for application terminals is a key link in the application of hydrogen energy. Among various potential hydrogen storage methods, material hydrogen storage is significantly superior to high-pressure gas storage and low-temperature liquid storage in terms of safety and practicability, and is generally considered to have the most development prospects. Although traditional metal / alloy hydride systems and nanostructured carbon materials generally have the advantages of excellent kinetic properties and low operating temperature, their hydrogen storage capacity is low, which cannot meet the commercializ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02
Inventor 王平康向东成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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