Sodium alanate and rare earth-nickel base alloy composite hydrogen storage material and preparation thereof

A technology of nickel-based alloy and sodium aluminum hydride, which is applied in the field of hydrogen storage materials, can solve the problems of being unable to adapt to large-scale application of industrial production, lack of hydrogen storage capacity, and large molecular weight, and achieve good low-temperature reversible hydrogen storage performance, suitable for large Large-scale development and application, the effect of improving catalytic hydrogen storage efficiency

Inactive Publication Date: 2009-04-22
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reason is mainly Ti-NaAlH 4 The high-valence organic / inorganic compound catalyst (such as Ti(OBu n ) 4 、TiCl 3 、TiF 3 etc.) itself does not have hydrogen storage capacity and has a large molecular weight, and in the reaction process, the catalyst reacts with NaH to generate a non-volatile inert by-product, which consumes part of the hydrogen storage material, making NaAlH 4 The actual hydrogen storage capacity of the system is reduced
On the other hand, the traditional Ti(OBu n ) 4 、TiCl 3 、TiF 3 The preparation process of such organic / inorganic compound catalysts is complicated, the technical requirements are strict, and the price is expensive, which cannot adapt to the large-scale application of industrial production

Method used

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  • Sodium alanate and rare earth-nickel base alloy composite hydrogen storage material and preparation thereof
  • Sodium alanate and rare earth-nickel base alloy composite hydrogen storage material and preparation thereof
  • Sodium alanate and rare earth-nickel base alloy composite hydrogen storage material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The NaH and Al raw materials used are commercial materials, the particle size of NaH powder is 74 μm, and the particle size of Al powder is 74 μm; according to the general chemical formula RENi of rare earth-nickel-based alloy 5 , select RE as La, which constitutes LaNi 5 Alloys according to LaNi 5 The chemical formula weighs La and Ni with a purity of more than 99%, and takes a 40-gram sample and repeatedly melts it in a high-frequency vacuum magnetic levitation furnace for 3 times to ensure that the alloy composition is uniform. The cast LaNi obtained by melting 5 After the alloy is mechanically crushed to 74 μm, it is put into a ball mill tank filled with 0.5MPa hydrogen (purity ≥ 99.99%) for pre-ball milling for 10 hours to obtain LaNi 5 Alloy powder; then NaH and Al (NaH and Al molar ratio is 1:1, the same below) powder and the LaNi of above-mentioned pre-ball milling process 5 The powders were evenly mixed according to the mass percentage of 0.9:0.1, and then ba...

Embodiment 2

[0026] Raw materials used NaH, Al and cast LaNi 5 The parameters of the alloy are the same as in Example 1. The as-cast LaNi obtained by smelting 5 After the alloy is mechanically crushed to 74 μm, it is put into a ball mill jar filled with 1MPa hydrogen (purity ≥99.99%) and argon (purity ≥99.99%) for pre-ball milling for 15 hours to obtain LaNi 5 Alloy powder; then the NaH / Al powder was mixed with the above-mentioned LaNi pre-milled in different atmospheres 5 The powders were uniformly mixed according to the mass percentage of 0.85:0.15, and then ball milled for 10 hours under 0.5MPa hydrogen (purity ≥ 99.99%) to finally prepare 85wt.% (Na / Al) + 15wt.% LaNi 5 Composite hydrogen storage materials.

[0027] The hydrogen absorption and desorption properties of the prepared composite hydrogen storage materials were measured by "constant volume-pressure difference method". The hydrogen absorption and desorption cycle conditions are: hydrogen absorption at 100°C and 10MPa, hydr...

Embodiment 3

[0030] Raw materials used NaH, Al and LaNi 5 The pre-milling parameters of the powder are the same as in Example 1. Mix NaH / Al powder with pre-milled LaNi 5 The powders were evenly mixed according to the mass percentage of 0.65:0.35, and then ball-milled for 1 hour under 0.5MPa hydrogen (purity ≥ 99.99%) to finally prepare 65wt.% (Na / Al) + 35wt.% LaNi 5 Composite hydrogen storage materials.

[0031] image 3 Is 65wt.% (Na / Al) + 35wt.% LaNi 5 Hydrogen absorption kinetics of the composites milled for 1 h at 100 °C. It can be seen that the hydrogen absorption capacity of the prepared composite hydrogen storage material at 100°C can reach more than 3.7wt.%, and the material can reach the maximum value in the first cycle, showing good activity performance.

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Abstract

The invention discloses sodium aluminum hydride and rare earth-nickel base alloy composite hydrogen storage material consisting of sodium aluminum hydride and rare earth-nickel base alloy. The mass percent of the rare earth-nickel base alloy is between 5 and 35 percent and the balance being sodium aluminum hydride; wherein the rare earth-nickel base alloy has a chemical general expression of RENi5, and RE in the general expression can be La, Ce, Pr, Nd, Y, Ml or Mm. The preparation method for the sodium aluminum hydride and rare earth-nickel base alloy composite hydrogen storage material is a high-energy ball milling method. The preparation method is simple. The prepared sodium aluminum hydride and rare earth-nickel base alloy composite hydrogen storage material has good activation hydrogen storage performance and hydrogen discharging kinetics, and a reversible hydrogen storage capacity of above 3.7 weight percent without adding a special catalyst. The composite hydrogen storage material can be applied to miniature mobile phones, laptops, the hydrogen supply sources of independent galvanic pile systems, the field of hydrogen purification, and the like.

Description

technical field [0001] The invention relates to a sodium aluminum hydride and rare earth-nickel-based alloy composite hydrogen storage material and a preparation method thereof, belonging to the field of hydrogen storage materials. Background technique [0002] Energy is the source of human social activities. The wide application of hydrogen energy is considered to be the breakthrough of today's energy revolution. It has become a global consensus to devote to the development of clean and renewable energy technology using hydrogen as the energy carrier. Among them, it is related to the fuel cell hydrogen source system. The research and application of new high-capacity hydrogen storage materials have received full attention from all over the world. So far, liquid hydrogen, lightweight high-pressure containers and metal hydride systems in hydrogen storage technology have all been successfully operated on hydrogen-fired vehicles or electric vehicles. Among the above three hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 肖学章陈立新范修林陈长聘王新华
Owner ZHEJIANG UNIV
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