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Composite hydrogen storage material for complexing hydrides and hydrogen storage alloys

A technology of hydrogen storage materials and hydrogen storage alloys, which is applied in the production of hydrogen, chemical instruments and methods, and other chemical processes to achieve good reversible hydrogen storage and discharge performance

Active Publication Date: 2012-11-14
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: configure TiMn according to stoichiometric ratio 2 The alloy was prepared by induction melting. After mechanical crushing to -40 mesh, under the protection of 2.5-4MPa hydrogen atmosphere, ball to material ratio 20:1-30:1, 400-450rpm rotation speed, ball milling for 40-50 hours to obtain alloy powder with an average particle size of 25μm.

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

Embodiment 2

[0025] N component: LaNi is configured according to the stoichiometric ratio 5 The alloy was prepared by induction melting. After mechanical crushing to -40 mesh, ball mill is used for 30-35h under the protection of 2-3MPa hydrogen atmosphere.

[0026] Composites: To NaAlH 4 5 wt. % of the above alloy powder relative to the total amount of the composite hydrogen storage material is added to the powder, which is sealed with the steel ball in a ball-milling tank, and the ball-to-material ratio is 15:1-20:1. The ball mill tank is evacuated and filled with hydrogen with a purity of >99.99% at 2-3.5MPa, and the ball milling time is 2-5 hours to obtain a composite material with an average particle size of image 3 (the abscissa time / min in the figure represents the hydrogen absorption time, and the ordinate H / wt% represents the gravimetric hydrogen absorption capacity). The reversible hydrogen release of the composite material was 4.2 wt. %, and the hydrogen release process was co...

Embodiment 3

[0028] N component: prepare the alloy according to the stoichiometric ratio of titanium 26at.%, chromium 20at.%, vanadium 45at.%, iron 8.5at.%, and prepare Ti by induction melting 26 Cr 20 V 45 Fe 9.0 The alloy is mechanically crushed to -40 mesh, and then ball milled for 30-35h under the protection of 3-5MPa hydrogen atmosphere, the ratio of ball to material is 20:1-25:1, and the speed is 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 to the powder mixture of NaH:Al=1:1, and seal it with the steel ball in a ball mill, with a ball-to-material ratio of 25:1-30:1 . The ball mill tank is evacuated and filled with hydrogen with a purity of 6-8MPa> 99.99%, and the ball milling time is 8-10 hours to obtain a composite material with an average particle size of Figure 4 (the abscissa time / min in the figure represents the hydr...

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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 burns with oxygen to produce pure water, so it is non-toxic, odorless, and pollution-free. In the whole hydrogen energy system, hydrogen storage is the 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 NaAlH 4 The theoretical hydrogen storage capacity reaches 5.5 wt%, and under the action of Ti-based catalysts, the reversible and effective hydrogen release of more than 3.5 wt% can be achieved at 160 °C, which has attracted extensive attention (B. et al, J. Alloys Compd. 253, 1 (1997)). However, limited ...

Claims

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Application Information

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Patent Type & Authority Patents(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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