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NaAlH4-titanium-vanadium base solid solution hydrogen storage composite material and preparation method thereof

A technology for hydrogen storage materials and solid solutions, which is applied in the production of hydrogen and other directions, can solve the problems affecting the hydrogen absorption and desorption performance of materials, and achieve the effects of simple and easy preparation process, high hydrogen storage capacity, and increased rate.

Active Publication Date: 2010-06-23
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the above mentioned to NaAlH 4 Adding catalysts such as metal chlorides or fluorides will make NaAlH 4 Inert substances such as NaCl and NaF are generated during the hydrogen absorption and desorption cycle, which affects the hydrogen absorption and desorption performance of the material

Method used

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  • NaAlH4-titanium-vanadium base solid solution hydrogen storage composite material and preparation method thereof
  • NaAlH4-titanium-vanadium base solid solution hydrogen storage composite material and preparation method thereof
  • NaAlH4-titanium-vanadium base solid solution hydrogen storage composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a glove box protected by high-purity argon (purity greater than 99.95%), 5mol% of Ti with an average particle size of less than 50μm 30 Cr 25.5 V 40 Fe 4.5 Alloy powder with 95mol% NaAlH 4 The material is mechanically ground and mixed in an agate mortar for 30 minutes, and then put into a stainless steel ball mill tank, and a stainless steel ball with a diameter of 8-10 mm is filled into the tank according to the ball weight ratio of 10:1. After the stainless steel ball mill tank is sealed, The tank is filled with 5.0 MPa hydrogen with a purity of> 99.99%, and then ball milled for 10 hours under the process of a planetary ball mill (300 revolutions / min, 600 revolutions / min). The hydrogen storage test results show that the composite hydrogen storage material can reversibly release 2.0 wt% of hydrogen within 1 h at 150°C, and the total amount of hydrogen released is 4.4 wt%. The kinetic curve of hydrogen release at 150°C and 0.1MPa for the composite is as figure 1 Shown....

Embodiment 2

[0023] In a glove box protected by high-purity argon (purity greater than 99.95%), 10mol% of Ti with an average particle size of less than 50μm 40 Cr 30 V 25 Fe 5 Alloy powder with 90mol% NaAlH 4 Material, mechanically grind and mix in an agate mortar for 30 minutes, put it into a stainless steel ball mill tank, and fill the tank with stainless steel balls with a diameter of 8-10mm according to the ball weight ratio of 20:1. After the stainless steel ball mill tank is sealed, The tank is filled with hydrogen with a purity of >99.99% of 0.5MPa, and then ball milled for 5 hours under the process of a planetary ball mill (300 revolutions / min, 600 revolutions / min). The hydrogen storage test results show that the composite hydrogen storage material can reversibly release 2.5 wt% of hydrogen within 1 h at 150°C, and the total amount of hydrogen released is 4.1 wt%. The kinetic curve of hydrogen release at 150°C and 0.1MPa for the composite is as figure 2 Shown.

Embodiment 3

[0025] In a glove box protected by high-purity argon (purity greater than 99.95%), 30 mol% of Ti with an average particle size of less than 50 μm 35 Cr 35 V 30 Fe 0 Alloy powder with 70mol% NaAlH 4 Material, mechanically grind and mix in an agate mortar for 30 minutes, put it into a stainless steel ball mill tank, and fill the tank with stainless steel balls with a diameter of 8-10mm according to the ball weight ratio of 5:1. After the stainless steel ball mill tank is sealed, The tank is filled with hydrogen with a purity of >99.99% of 1.5MPa, and then ball milled for 20 hours under the process of a planetary ball mill (300 revolutions per minute, 600 revolutions per minute). The hydrogen storage test results show that the composite hydrogen storage material can reversibly release 2.6wt% of hydrogen within 1h at 150°C, and the total hydrogen release is 4.0wt%.

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Abstract

The invention relates to a hydrogen storage composite material with the general formula of (NaAlH4)y-Rx, wherein R is titanium-vanadium base solid solution alloy, y and x are both mole percent, x is not less than 5 mol% and is not more than 50mol %, and y+x=100mol %. R solid solution alloy is Tix1CrX2Vx3Fex4, wherein x1+x2+x3+x4=100at%(atom percent), x1 is not less than 25at % and is not more than 40at%, x2 is not less than 20at% and is not more than 45at%, x3 is not less than 20at% and is not more than 55at%, and x4 is not less than 0at% and is not more than 10at%. The hydrogen storage composite material is prepared by adopting a hydrogen-protecting mechanical ball-milling synthesizing process, and has effective hydrogen discharge of above 2.0wt% within 1h under the conditions that the temperature is 150 DEG C and the pressure is 0.1MPa and the total hydrogen discharge amount is above 3.8wt%. The preparation method of the hydrogen storage composite material is simple and easy, and has higher hydrogen storage capacity and hydrogen charge and discharge rate under mild conditions.

Description

Technical field [0001] The invention relates to a hydrogen storage material, in particular to a NaAlH 4 -Titanium vanadium solid solution composite hydrogen storage material and preparation method thereof. Background technique [0002] Hydrogen is non-toxic and odorless, and it is combusted with oxygen to produce pure water, and water can be electrolyzed to obtain hydrogen. Therefore, hydrogen resources are abundant and inexhaustible. It is a clean and ideal fuel, which is important in future hydrogen vehicles. Prospects. According to the U.S. Department of Energy (DOE) standard proton exchange membrane fuel cell (PEMFC) vehicle technical requirements, when the vehicle's travel distance reaches 480km, the vehicle-mounted hydrogen demand is about 3.58kg. If solid hydrogen storage materials are used for vehicle-mounted hydrogen storage, Within the required volume and weight range, the hydrogen storage capacity of the solid hydrogen storage material must reach at least 6wt%, but cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 刘晓鹏米菁蒋利军王树茂李志念郝雷李华玲李国斌
Owner GRIMAT ENG INST CO LTD
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