Metal amino borane composite hydrogen storage material

An aminoborane, hydrogen storage material technology, applied in non-metallic elements, hydrogen, inorganic chemistry and other directions, can solve the problems of high hydrogen desorption temperature, slow hydrogen desorption kinetics, and decreased hydrogen storage density, and achieves simple process and preparation. Efficient effect

Active Publication Date: 2020-09-04
GRIMAT ENG INST CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still high dehydrogenation temperatures, slow dehydrogenation kinetics and harmful by-products in the dehydrogenation process to be used in actual production applications. At present, the widely used method to improve the dehydrogenation performance of ammonia borane is to hydrogenate it by adding alkali / alkaline earth metals. However, the dehydrogenation temperature of the hydrogen storage system obtained by this method is still relatively high, and there is still a small amount of NH in the dehydrogenation product. 3 , B 2 h 6 other impurity gases
In addition, the effect of catalytic hydrogen desorption is achieved by adding transition metals and their alloys, but since the catalytic additives do not participate in the hydrogen desorption of the system, the hydrogen storage density decreases and the hydrogen desorption kinetics is slow.

Method used

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  • Metal amino borane composite hydrogen storage material
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  • Metal amino borane composite hydrogen storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using a planetary ball mill equipped with a remote temperature-pressure monitoring system, the raw materials LiH, NH 3 BH 3 Put it into the ball mill tank at a ratio of 1.01:1, the ball-to-material ratio is 50:1, fill with hydrogen to 4bar, set the upper temperature limit of the ball mill tank to 30°C, and the ball mill speed to 400r / min. The temperature and pressure changes in the ball milling tank were monitored and regulated in real time, and the cumulative ball milling time was 10 hours.

[0024] Take the product after ball milling in the glove box, and carry out XRD structure analysis after sealing the sample preparation, such as figure 1 In the 1-a data line, the product is α-LiNH 2 BH 3 and LiH complexes.

[0025] Take 5-10 mg of the prepared product, conduct DSC analysis at a heating rate of 2K / min, and perform mass spectrometry analysis on the emitted gas, the results are as follows: figure 2 2-a data line and Figure 3-a As shown, the initial hydrogen d...

Embodiment 2

[0031] Using a planetary ball mill equipped with a remote temperature-pressure monitoring system, the raw materials LiH, NH 3 BH 3 , The V-Ti-Cr alloy is loaded into the ball mill tank at a ratio of 1.01:1:0.1, the ball-to-material ratio is 50:1, filled with hydrogen to 10bar, the upper limit of the ball mill temperature is set to 30°C, and the ball mill speed is 400r / min. The temperature and pressure changes in the ball milling tank were monitored and regulated in real time, and the cumulative ball milling time was 8 hours.

[0032]The analysis method of sample structure, hydrogen desorption temperature and kinetics is the same as that of Example 1, and the XRD analysis results of the ball milled product show that, as shown in Figure 3, after adding V-Ti-Cr, α-LiNH is removed from the product 2 BH 3 And LiH phase, appear (V-Ti-Cr)H x phase, which shows that the hydrogen storage alloy has been hydrogenated during the ball milling process.

[0033] Take 0.5g of the compos...

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Abstract

The invention discloses a metal amino borane composite hydrogen storage material, and belongs to the technical field of solid hydrogen storage materials. The metal amino borane composite hydrogen storage material is prepared from an alpha-LiNH2BH3 phase, a LiH phase and a hydrogen storage alloy hydride phase, LiH, NH3BH3 and a hydrogen storage alloy are used as raw materials and subjected to in-situ metallization composite ball milling, and the molar ratio of the NH3BH3 to the LiH to the hydrogen storage alloy is 1: (1.01-1.05): (0.1-0.5). Compared with ammonia borane, the metal ammonia boranecomposite hydrogen storage material has the advantages that the metal ammonia borane can rapidly release hydrogen near the room temperature, the hydrogen release kinetics is faster, no foreign gas isgenerated, the preparation process is simple, the efficiency is high, and the metal ammonia borane composite hydrogen storage material can be used for a high-safety high-density solid hydrogen sourceof a fuel cell.

Description

technical field [0001] The invention belongs to the technical field of solid-state hydrogen storage materials, and in particular relates to a metal aminoborane composite hydrogen storage material. Background technique [0002] Hydrogen plays an extremely important role in the current global energy system. Lightweight and high-capacity solid-state hydrogen storage materials can meet the needs of safe storage and transportation of hydrogen. However, in the actual application process, these solid-state hydrogen storage materials often have high hydrogen desorption temperature and low hydrogen desorption capacity, which is difficult to meet the needs of actual production. Therefore, it is urgent to find a method for preparing solid-state hydrogen storage materials with high capacity and mild hydrogen release conditions, in order to meet the application requirements of hydrogen storage materials in the field of fuel cells. [0003] At present, ammonia borane, as a representative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00
CPCC01B3/0078C01B3/0031C01P2002/72Y02E60/32
Inventor 武媛方刘晓然王树茂蒋利军李志念叶建华袁宝龙郭秀梅
Owner GRIMAT ENG INST CO LTD
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