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Composite hydrogen storage material for complexing hydrides and hydrogen storage alloys

A technology for hydrogen storage material and hydrogen storage alloy, which is applied in the fields of hydrogen production, chemical instruments and methods, and other chemical processes to achieve the effect of good reversible hydrogen storage and desorption performance.

Active Publication Date: 2011-03-30
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In comparison, conventional metal hydrides such as AB 5 、AB 2 The effective hydrogen storage capacity of , AB and solid solution hydrogen storage alloys is lower than that of complex hydrides, but they have incomparably excellent hydrogen storage and release kinetic properties of the latter

Method used

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  • Composite hydrogen storage material for complexing hydrides and hydrogen storage alloys
  • Composite hydrogen storage material for complexing hydrides and hydrogen storage alloys
  • Composite hydrogen storage material for complexing hydrides and hydrogen storage alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] N component: TiMn is configured according to the stoichiometric ratio 2 Alloys are prepared by induction melting. After mechanically crushing to -40 mesh, under the protection of 2.5-4MPa hydrogen atmosphere, the ball-to-material ratio is 20:1-30:1, and the rotating speed is 400-450rpm, and the alloy powder with an average particle diameter of 25μm is obtained.

[0023] Composite material: To NaAlH 4 The powder is added with 10wt.% of the above-mentioned alloy powder relative to the total amount of the composite hydrogen storage material, and is sealed in a ball mill tank with steel balls, with a ball-to-material ratio of 10:1-20:1. The ball milling tank is evacuated and filled with 2-3MPa hydrogen with a purity of >99.99%, and the ball milling time is 3-5 hours under the condition of 350-400rpm to obtain a composite material with an average particle size of figure 2 As shown (in the figure, the abscissa time / min represents the hydrogen absorption time, and the ordinate H / w...

Embodiment 2

[0025] N component: LaNi is configured according to the stoichiometric ratio 5 Alloys are prepared by induction melting. After mechanically crushing to -40 mesh, use ball milling under the protection of 2-3 MPa hydrogen atmosphere for 30-35 hours, with a ball-to-material ratio of 15:1-20:1, and a speed of 400-450rpm to obtain powder with an average particle size of 20μm.

[0026] Composite material: To NaAlH 4 The powder is added with 5wt.% of the above-mentioned alloy powder relative to the total amount of the composite hydrogen storage material, and is sealed in a ball mill tank with steel balls, and the ball-to-material ratio is 15:1-20:1. The ball milling tank is evacuated and filled with 2-3.5MPa hydrogen with a purity of> 99.99%, and the ball milling time is 2-5 hours to obtain a composite material with an average particle size image 3 As shown (in the figure, the abscissa time / min represents the hydrogen absorption time, and the ordinate H / wt% represents the weight hydroge...

Embodiment 3

[0028] N component: According to the stoichiometric ratio of titanium 26at.%, chromium 20at.%, vanadium 45at.%, and iron 8.5at.%, the alloy is prepared, and Ti is prepared by induction melting 26 Cr 20 V 45 Fe 90 After the alloy is mechanically crushed to a size of -40 mesh, it is milled for 30-35 hours under the protection of a hydrogen atmosphere of 3-5 MPa, with a ball-to-battery ratio of 20:1-25:1, and a speed of 400-450rpm to obtain powder with an average particle size of 15μm.

[0029] Composite material: Add 40wt.% of the above alloy powder relative to the total amount of the composite hydrogen storage material into the powder mixture of NaH:Al=1:1, and seal it with the steel ball in a ball mill tank, with a ball-to-material ratio of 25:1-30:1 . The ball milling tank is evacuated and filled with hydrogen with a purity of 6-8MPa> 99.99%. The milling time is 8-10 hours to obtain a composite material with an average particle size Figure 4 As shown (in the figure, the abscissa...

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Abstract

The invention relates to a composite hydrogen storage material for complexing hydrides and hydrogen storage alloys. The composite hydrogen storage material is powdered and is formed by compounding a component M and a component N, and the general formula of the composite hydrogen storage material is (1-x)M+xN, wherein the x is between 0.05 and 0.40 in part by mass, and the average grain diameter of the composite material is less than 15 micrometers. The component M is NaAlH4 powder or a mixture of NaH and Al powder which are equimolar; and the component N is hydrogen storage alloy powder prepared from one or more of lanthanum, cerium, nickel, manganese, titanium, zirconium, vanadium, ferrum and chromium elements. The effective hydrogen desorption capacity of the composite material is over 3.7 weight percent within 50 minutes at the temperature of 150 DG C under the pressure of 0.1 MPa.

Description

Technical field [0001] The invention relates to a composite hydrogen storage material of complex hydride and hydrogen storage alloy. Background technique [0002] Hydrogen is a clean fuel that is combusted with oxygen to produce pure water, so it is non-toxic, odorless, and pollution-free. In the entire hydrogen energy system, hydrogen storage is a key link. Traditional metal hydride hydrogen storage alloys such as AB 5 , AB 2 The effective hydrogen storage capacity of, AB and solid solution alloys does not exceed 2wt%, which is difficult to meet the hydrogen storage capacity requirements of future vehicle-mounted hydrogen source systems. [0003] Complex hydrides such as NaAlH4 have a theoretical hydrogen storage capacity of 5.5wt%, and can achieve reversible and effective hydrogen release of more than 3.5wt% at 160°C under the action of a Ti-based catalyst, and have received widespread attention (B. et al, J. Alloys Compd. 253, 1 (1997)). However, due to the poor kinetic perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02C01B3/02
Inventor 刘晓鹏米菁蒋利军李志念王树茂郝雷吕芳李国斌
Owner GRIMAT ENG INST CO LTD
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