CeH2.5-NaH-Al composite hydrogen storage material and preparation method thereof

A hydrogen storage material, storage and storage technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, hydrogen, etc. problem, to achieve the effect of good cycle stability and reversible hydrogen storage and desorption performance

Inactive Publication Date: 2010-06-16
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Problems solved by technology

[0007] NaAlH 4 The price is expensive (the unit price is 20 yuan / gram), and Bogdanovic et al. use cheap NaH and Al powder as raw materials (the price is NaAlH 4 1 / 15 of), in Ti(OBu n ) 4 、TiCl 3 Under the action of other catalysts, the reverse reaction synthesizes NaAlH 4 The method of hydrogen storage materials has been successful [B.Bogdanovic, M.Schwickardi.Appl.Phys.A, 2001, 72:221], but because the catalysts they use do not have hydrogen storage capacity and have a large molecular weight, During the reaction, non-volatile inert by-products (Na 2 O, NaCl), so the effective hydrogen storage capacity of the reverse reaction synthesis system is lower than 4wt%, and the distance is expressed as NaAlH 4 There is a certain gap in the hydrogen desorption performance of the hydrogen storage raw material system
In this regard, Wang et al. used simple Ti powder and TiH 2 As a catalyst, to avoid harmful inert by-products in the reverse reaction synthesis of the catalyst, NaAlH is synthesized by reverse reaction with NaH and Al powder 4 For hydrogen storage materials, a composite hydrogen storage material with a hydrogen storage capacity of 3.3wt% has been obtained [P.Wang, C.M.Jensen.J.Phys.Chem.B.2004, 108:15827], but the cyclic hydrogen storage and discharge capacity of the system Significant attenuation

Method used

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  • CeH2.5-NaH-Al composite hydrogen storage material and preparation method thereof
  • CeH2.5-NaH-Al composite hydrogen storage material and preparation method thereof
  • CeH2.5-NaH-Al composite hydrogen storage material and preparation method thereof

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Effect test

Embodiment 1

[0025] Using commercially available NaH powder (purity 95%, average particle size about 74 μm) and Al powder (purity ≥ 99%, particle size 74-154 μm) as raw materials, in a glove box with oxygen and water content less than 1ppm, molar Mixed at a ratio of 1:1, 4% mole of the CeH prepared by the above method 2.5 After mechanically grinding and mixing with the mixture of 48% mole NaH and 48% mole Al, stainless steel balls (diameter 12mm) are sealed into the ball mill jar with the weight ratio of ball material 35:1, and the room temperature mechanical pump (ultimate vacuum 10 -2Pa) Vacuum for 20 to 30 minutes and then fill with 5Mpa hydrogen, then ball mill for 12 hours at a vibration frequency of 3000 times / min in a ball mill with an amplitude of 0 to 44 mm and an amplitude ≠ 0 to obtain a 4% mole CeH 2.5 CeH 2.5 -NaH-Al composite hydrogen storage material, its hydrogen absorption and desorption kinetic curve is as follows figure 1 Shown, the hydrogen storage and discharge capac...

Embodiment 2

[0027] Using commercially available NaH powder (purity 95%, average particle size about 74 μm) and Al powder (purity ≥ 99%, particle size 74-154 μm) as raw materials, in a glove box with oxygen and water content less than 1ppm, molar Mixed at a ratio of 1:1, 3% mole of the CeH prepared by the above method 2.5 After mechanically grinding and mixing with the mixture of 48.5% mole NaH and 48.5% mole Al, stainless steel balls (diameter 12mm) are sealed into the ball mill jar with the weight ratio of ball material 35:1, and the room temperature mechanical pump (ultimate vacuum 10 -2 Pa) After evacuating for 20-30 minutes, fill it with 5Mpa hydrogen, then ball mill for 18 hours at a vibration frequency of 3000 times / min, in a ball mill with an amplitude of 0-44 mm and an amplitude ≠ 0, to obtain 3% mole CeH 2.5 Catalyzed NaH / Al material, its hydrogen absorption and desorption kinetic curve is as follows figure 2 Shown, the hydrogen storage and discharge capacity is based on NaH / Al...

Embodiment 3

[0029] Using commercially available NaH powder (purity 95%, average particle size about 74 μm) and Al powder (purity ≥ 99%, particle size 74-154 μm) as raw materials, in a glove box with oxygen and water content less than 1ppm, molar Mixed at a ratio of 1:1, 3% mole of the CeH prepared by the above method 2.5 After mechanically grinding and mixing the mixture of 48.5% mole NaH and 48.5% mole Al, stainless steel balls (diameter 12mm) are sealed into the ball mill jar with the weight ratio of ball material 44:1, and the room temperature mechanical pump (ultimate vacuum 10 -2 Pa) Vacuumize for 20-30 minutes and fill with 6Mpa hydrogen, then ball mill for 18 hours at a vibration frequency of 3000 times / min in a ball mill with an amplitude of 0-44mm and amplitude ≠0 to obtain 3% mole CeH 2.5 -NaH-Al composite hydrogen storage material, its hydrogen absorption and desorption kinetic curve is as follows image 3 Shown, the hydrogen storage and discharge capacity is based on NaH / Al a...

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Abstract

The invention relates to CeH2.5-NaH-Al composite hydrogen storage material and preparation method thereof. The composite hydrogen storage material is prepared by mixing 1-4 percent mol of CeH2.5 with grain size of less than 0.5mum and 48-49.5 percent mol of NaH as well as 48-49.5 percent mol of Al through hydrogenation and ball-milling, wherein the ratio of NaH to Al is 1:1. The composite material has effective hydrogen discharge capacity reaching 4.3wt% under the conditions that the temperature is 150 DEG C and the atmosphere pressure is 1, reversibly absorbs the hydrogen of above 4.9 wt% under the conditions that the temperature is 120 DEG C and the hydrogen absorption pressure is 10.0MPa, and has better cyclical stability.

Description

technical field [0001] The present invention relates to a CeH 2.5 -NaH-Al composite hydrogen storage material and preparation method thereof, using CeH 2.5 , NaH and Al powders, in the preparation method of hydrogen protection reaction mechanical ball milling, synthetic CeH 2.5 -NaH-Al composite hydrogen storage material, under 150 DEG C and 1 atmospheric pressure hydrogen desorption pressure, the effective dehydrogenation capacity is greater than 3.6wt%, and the maximum dehydrogenation capacity can reach 4.3wt%. And the price is only based on commercial NaAlH 4 CeH as raw material 2.5 -NaAlH 4 1 / 20 of the composite hydrogen storage material. Background technique [0002] Facing the dual pressure of increasingly scarce fossil fuel resources and deteriorating ecological environment, the development of hydrogen energy technology to replace fossil fuels has become an important issue. Hydrogen storage is the most critical link in the entire hydrogen energy technology. Che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C01B3/00C01B6/34
CPCY02E60/324Y02E60/32
Inventor 刘晓鹏张艺萌蒋利军王树茂李志念李国斌
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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