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NaAlH* compound hydrogen storage material catalyzed by Ce hydride and preparation method thereof

A technology for hydrogen storage material and hydride, which is applied in the field of NaAlH4 composite hydrogen storage material catalyzed by Ce hydride and its preparation, can solve the problems of consumption of complex hydride, damage to fuel cell performance, reduction of hydrogen storage capacity, etc. Effect of cycle stability and reversible hydrogen storage and desorption performance

Inactive Publication Date: 2009-12-16
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above additives are introduced to NaAlH 4 In addition to the cationic titanium that plays a major role in modifying the hydrogen storage performance, a large amount of NaAlH 4 Anions with unfavorable hydrogen storage performance; for example, ester anions can release C-H hydrocarbon gas that is harmful to the performance of fuel cells, while halogen anions will react with Na in the raw material to form salts, consume part of the complex hydride and reduce hydrogen storage quantity

Method used

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  • NaAlH* compound hydrogen storage material catalyzed by Ce hydride and preparation method thereof
  • NaAlH* compound hydrogen storage material catalyzed by Ce hydride and preparation method thereof

Examples

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Embodiment 1

[0026] Using NaAlH produced by Acros organics company in the United States 4 It is raw material (purity is 93%, particle size is -325 mesh). In a glove box with an oxygen and water content of less than 1ppm, 4% mol of the CeH prepared by the above method 2.5 with 96% molar NaAlH 4 After mechanically grinding and mixing evenly, seal stainless steel balls (diameter 8mm) together with them into the ball mill jar with a weight ratio of 8:1 to 15:1, and mechanical pump at room temperature (ultimate vacuum 10 -2 Pa) After vacuuming for 20-30 minutes, fill it with hydrogen gas of 1.8-3Mpa, then ball mill for 5-10 hours at a vibration frequency of 3000 times / min, in a ball mill with an amplitude of 0-44mm and amplitude ≠0, and obtain 4% mole CeH 2.5 Catalyzed NaAlH 4 Hydrogen storage material, its hydrogen absorption and desorption kinetic curve is as follows figure 1 Shown, the hydrogen storage and discharge capacity is based on NaAlH 4 and doped CeH 2.5Total weight calculation...

Embodiment 2

[0028] Using NaAlH produced by Acros organics company in the United States 4 It is raw material (purity is 93%, particle size is -325 mesh). In a glove box with an oxygen and water content of less than 1ppm, 1% mole of the CeH prepared by the above method 2.5 with 99% molar NaAlH 4 After mechanically grinding and mixing evenly, seal stainless steel balls (diameter 8mm) together with them into the ball mill jar with a weight ratio of ball to material of 8:1~15:1, vacuumize at room temperature for 20~30min, fill with 1.8~3Mpa hydrogen, and then Vibration frequency is 3000 times / min, ball milling in a ball mill with amplitude 0-44mm and amplitude ≠0 for 5-10h to obtain 1mol% CeH 2.5 Catalyzed NaAlH 4 Composite hydrogen storage material, its hydrogen absorption and desorption kinetic curve is as follows figure 2 Shown, the hydrogen storage and discharge capacity is based on NaAlH 4 and doped CeH 2.5 Calculated by the total weight, the material absorbs 4.0% of hydrogen withi...

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Abstract

The invention relates to an application of a catalyst of Ce hydride, a preparation method of the catalyst of Ce hydride, and a NaAlH* compound hydrogen storage material catalyzed by the Ce hydride and a preparation method thereof. Using Ce hydride as material to catalyze the NaAlH* realizes the application of the catalyst of rare earth hydride which reversibly stores and discharges hydrogen. The chemical formula of the Ce hydride is CeH2.5. NaAlH* compound hydrogen storage material catalyzed by the CeH2.5 is formed by the hydrogenation reaction of 1-4 percent mol of CeH2.5 with granularity less than 0.5 micrometer and 99-96 percent mol of NaAlH4 and ball-milling. The preparation method comprises the following steps: sealing 1-4 percent mol of CeH2.5 with granularity less than 0.5 micrometer and 99-96 percent mol of NaAlH4 in a stainless ball-milling tank, mechanically milling balls for 5-10h under the conditions of 1.8-3MPa hydrogen protective atmosphere and the weight proportion of grains being 8:1-15:1, and preparing the NaAlH* compound hydrogen storage material catalyzed by the CeH2.5. The NaAlH* compound hydrogen storage material has better reversible hydrogen storage and discharge capacity and circulation stability, can reversibly store and discharge the hydrogen amount by more than 4.0wt% under the conditions of 160 DEG C and 1 atmosphere of hydrogen discharge pressure, and can reversibly store the hydrogen amount by 5.0wt%under the conditions of 120 DEG C and 9.0MPa.

Description

technical field [0001] The present invention relates to the catalyst application of Ce hydride, is based on rare earth Ce hydride CeH 2.5 Preparation of Ce hydride-catalyzed NaAlH as a catalyst 4 Composite hydrogen storage materials are made of complex hydride NaAlH by hydrogenation reaction and mechanical ball milling. 4 Synthesis of composite hydrogen storage materials. Background technique [0002] Energy is the material guarantee for the progress of human society, and a clean environment is the basis for the healthy development of human society. Human beings are facing the coordination problem of energy supply and environment. Due to the excessive concentration and depletion of oil resources, the modern energy system dominated by oil has caused a profound energy crisis in society. The development of new energy sources that replace oil is an urgent and important issue for the development of all mankind. The primary energy in the future energy should be an energy syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/06B01J31/12
CPCY02E60/362Y02E60/36
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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