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Magnesium-based hydrogen storage material capable of absorbing hydrogen at room temperature and preparation method thereof

A hydrogen storage material and room temperature technology, which is applied in the field of magnesium-based hydrogen storage materials absorbing hydrogen at room temperature and its preparation, can solve the problems of unfavorable practical application of magnesium-based hydrogen storage materials, achieve excellent catalytic activity, reduce hydrogen absorption and desorption temperature, Effect of improving hydrogen absorption and desorption performance

Active Publication Date: 2020-11-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, despite adding Nb 2 o 5 After MgH 2 The performance of magnesium-based hydrogen storage materials has been improved, but the complete desorption and absorption of hydrogen still needs to be completed at a high temperature of >250 ° C, which is quite unfavorable for the practical application of magnesium-based hydrogen storage materials.

Method used

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  • Magnesium-based hydrogen storage material capable of absorbing hydrogen at room temperature and preparation method thereof
  • Magnesium-based hydrogen storage material capable of absorbing hydrogen at room temperature and preparation method thereof
  • Magnesium-based hydrogen storage material capable of absorbing hydrogen at room temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) N-doped niobium pentoxide (referred to as N-Nb 2 o 5 ) preparation: add 0.03mol niobium ethanol to 20mL benzyl alcohol, stir until pale yellow, add 0.06mol triethylamine (the molar ratio of triethylamine and niobium ethanol is 2:1), stir well and seal it into the reaction vessel, Insulated at 250°C for 3 days, the product was washed with ethanol and dried at 90°C to obtain an N-doped niobium oxide-based catalyst with a molar ratio of N element to Nb element of 0.06:1.

[0042] (2) Ball milling treatment: In a glove box with an argon atmosphere, MgH 2 and N-Nb 2 o 5 Mix with a mass ratio of 10:1, put it into a stainless steel ball mill tank with balls, and perform ball milling to obtain a mixture;

[0043] Wherein, the ball-to-material ratio is 120:1, and ball milling is carried out at room temperature for 24 hours at a rotational speed of 500 rpm.

[0044] (3) Activation treatment: After ball milling, the mixture is first dehydrogenated at 300°C for 1 hour, and...

Embodiment 2

[0051] (1) N-doped niobium pentoxide (referred to as N-Nb 2 o 5 ) preparation method: add 0.03mol niobium ethanol to 20mL benzyl alcohol, stir until pale yellow, add 0.03mol triethylamine (the molar ratio of triethylamine and niobium ethanol is 1:1), stir well and seal it into the reaction kettle , kept at 250°C for 3 days, the product was washed with ethanol and dried at 90°C to obtain an N-doped niobium oxide-based catalyst with a molar ratio of N element to Nb element of 0.02:1.

[0052] (2) Ball milling treatment: In a glove box with an argon atmosphere, MgH 2 and N-Nb 2 o 5 Mix with a mass ratio of 100:1, put it into a stainless steel ball mill tank with balls, and perform ball milling to obtain a mixture;

[0053] Wherein, the ball-to-material ratio is 120:1, and ball milling is carried out at room temperature for 24 hours at a rotational speed of 500 rpm.

[0054] (3) Activation treatment: the mixture after ball milling is first dehydrogenated at 450°C for 2 hours,...

Embodiment 3

[0058] (1) N-doped TiNb 2 o 7 (referred to as N-TiNb 2 o 7 ) preparation method: 0.002mol niobium chloride and 0.001mol titanium tetraisopropoxide were added to 44mL ethanol, after stirring, 0.01mol triethylamine was added (the molar ratio of triethylamine and niobium chloride was 5:1), After stirring evenly, put it into a reaction kettle and keep it warm at 250°C for 3 days. The product was washed with ethanol and dried at 90°C to obtain an N-doped niobium oxide-based catalyst with a molar ratio of N element to Nb element of 0.12:1.

[0059] (2) Ball milling treatment: In a glove box with an argon atmosphere, MgH 2 and N-TiNb 2 o 7 Mix with a mass ratio of 10:1, put it into a stainless steel ball mill tank with balls, and perform ball milling to obtain a mixture;

[0060] Wherein, the ball-to-material ratio is 120:1, and ball milling is carried out at room temperature for 24 hours at a rotational speed of 500 rpm.

[0061] (3) Activation treatment: the mixture after ba...

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Abstract

The invention discloses a magnesium-based hydrogen storage material with room-temperature hydrogen absorption and a preparation method of the magnesium-based hydrogen storage material. The preparationmethod comprises the following step: in the presence of an inert gas or a hydrogen atmosphere, carrying out ball milling on MgH2 with an N-doped niobium oxide-based catalyst, thereby obtaining the magnesium-based hydrogen storage material with room-temperature hydrogen absorption, wherein the mass ratio of the MgH2 to the N-doped niobium oxide-based catalyst is (10-150):1, and the mole ratio of an N element to an Nb element is (0.005-0.15):1. Compared with a niobium oxide-based catalyst which is free of N doping, the magnesium-based hydrogen storage material which is prepared by introducing the N element into the niobium oxide-based catalyst and by carrying out ball milling with MgH2 is excellent in catalytic activity, is capable of further improving the hydrogen absorption and release performance of a magnesium-based hydrogen storage material and remarkably reducing hydrogen absorption and release temperatures, and can be completely hydrogenated at the room temperature; and in addition, a rapid hydrogen absorption and release speed and high circulation stability of the magnesium-based hydrogen storage material are kept, and the hydrogen storage capacity is kept at 6.0wt% or above.

Description

technical field [0001] The invention relates to the field of hydrogen storage materials, in particular to a magnesium-based hydrogen storage material capable of absorbing hydrogen at room temperature and a preparation method thereof. Background technique [0002] With the development of science and technology and the progress of human society, traditional fossil fuels are difficult to meet the ever-increasing demand for energy. The development of a new energy system based on hydrogen energy has become the key to the sustainable development of human society. Especially with the development of fuel cell technology, more and more attention has been paid to hydrogen as a vehicle energy technology, and hydrogen storage technology is the bottleneck restricting its practical application. [0003] Metal hydride hydrogen storage is a safe, efficient and economical method of hydrogen storage, which realizes the storage and release of hydrogen through the reversible reaction between hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/00B01J31/12B01J27/24
CPCB01J27/24B01J31/121B01J37/0036C01B3/0078Y02E60/32
Inventor 刘永锋王轲潘洪革高明霞
Owner ZHEJIANG UNIV
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