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Method for cheaply and extensively preparing nitrogen-based metal compound hydrogen storage material

A technology of hydrogen storage materials and compounds, applied in the direction of hydrogen production, etc., can solve the problems of difficult popularization and practical application, and achieve the effects of cost reduction, simple process, and strong safety and operability

Active Publication Date: 2016-07-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mg(NH 2 ) 2 Calculated with the price (Sigma) of commercially purchased LiH, the price of hydrogen storage materials alone is as high as 1.2 million RMB, so it is difficult to be practical or popularized

Method used

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  • Method for cheaply and extensively preparing nitrogen-based metal compound hydrogen storage material
  • Method for cheaply and extensively preparing nitrogen-based metal compound hydrogen storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Preparation of Li-N-H (LiNH 2 -LiH) system

[0016] (1) Weigh a certain amount of metallic lithium, such as 70g, in the glove box, then add it to the ball mill tank, and then inject 10-120atm ammonia gas or liquid ammonia.

[0017] (2) After adding lithium metal and ammonia gas as described in step (1), place the ball mill tank on a planetary ball mill at 100-200 rpm and mix for 1-20 hours, and at the same time make part of lithium metal react with ammonia gas to generate lithium amide.

[0018] (3) Take out the mixed sample in step (2) and place it in a pressure-resistant reactor for ammoniating. The ammoniating temperature is between 50-350℃; time is 1-50h; it can also be a long time (> 50h) Repeat step (2) until all metallic lithium is converted to lithium amide.

[0019] (4) As step (3), the lithium amide sample obtained after ammoniating is subjected to temperature program (fixed heating rate) deamination test (TPD-MS) to determine its deamination temperature, an...

Embodiment 2

[0022] Example 2: Preparation of Li-Mg-N-H(Mg(NH 2 ) 2 -nLiH) system

[0023] (1) Weigh a certain amount of metallic magnesium and a corresponding amount of metallic lithium (such as Mg(NH 2 ) 2 -2LiH system, the molar ratio of Mg and Li is 1:2, such as a total of 38g), and then added to the ball mill tank, and then injected ammonia gas (> 5atm) or liquid ammonia.

[0024] (2) After adding magnesium metal, lithium metal and ammonia gas as described in step (1), place the ball mill on a planetary ball mill at 50-200 rpm and mix for more than 1 hour until uniform, and at the same time make part of metal lithium or magnesium react with ammonia gas This produces lithium amide or magnesium amide.

[0025] (3) Take out the mixed sample in step (2) and place it in a pressure-resistant reactor for ammoniating, and the ammoniating temperature is between 150 and 400°C;

[0026] (4) As in step (3), the sample obtained after ammoniating is subjected to temperature-programmed deamination test (TPD...

Embodiment 3

[0029] Example 3: Preparation of KH modified Li-Mg-N-H(Mg(NH 2 ) 2 -nLiH-yKH) system

[0030] (1) Weigh a certain amount of metallic magnesium and corresponding amount of metallic lithium and metallic potassium (such as Mg(NH) 2 ) 2 -1.9LiH-0.1KH system, the molar ratio of Mg to Li and K is 1:1.9:0.1, for example, the total weight is 41.2g), then add to the ball mill tank, and then inject ammonia gas (> 2atm) or liquid ammonia.

[0031] (2) After adding magnesium metal, lithium metal, potassium metal and ammonia as described in step (1), place the ball mill pot on a planetary ball mill at 50 to 200 rpm to mix> 1h, until the mixing is uniform, and at the same time part of the metallic lithium, metallic potassium or magnesium reacts with ammonia gas to generate lithium amide, potassium amide or magnesium amide.

[0032] (3) Take out the mixed sample in step (2) and place it in a pressure-resistant reactor for ammoniating, and the ammoniating temperature is between 150 and 400°C;

[0033]...

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Abstract

The invention discloses a method for extensively preparing a nitrogen-based metal compound hydrogen storage material. The nitrogen-based metal compound hydrogen storage material is obtained through uniform mixing, calcining, deamination and hydrogenation with one or two or more of a metallic element, a metal hydride and a metal nitrogen-based compound as a host material and other compounds as an assistant. The metal nitrogen-based compounds can be one or two or more of a metal amino compound, a metal imino compound and a metal nitrogen compound. The metal element can be a group I-III metal or an early transition metal. The nitrogen-based metal compound hydrogen storage material can be safety, cheaply and extensively prepared through the method, so the preparation cost of the nitrogen-based metal compound hydrogen storage material is greatly reduced. The cheap hydrogen storage material provides extremely important guidance for civilianization and practicalization of hydrogen storage systems.

Description

Technical field [0001] The invention relates to the application of a method for cheaply preparing nitrogen-based metal compound hydrogen storage materials in the field of hydrogen storage technology, in particular to the safe and inexpensive large-scale preparation of nitrogen-based metal compound hydrogen storage materials. Background technique [0002] Carbon energy materials such as coal, oil, and natural gas have been depleted day by day, and their use is accompanied by serious environmental pollution. The problem of energy depletion and large amount of environmental pollution has forced people to develop new sustainable green energy sources, such as wind energy, solar energy, biological energy, and hydrogen energy. Among them, hydrogen energy is due to its abundant reserves and high mass energy density (142MJkg -1 ), the by-product (water) is green and environmentally friendly and has no pollution, and is favored by people. Therefore, the vigorous development of hydrogen en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 陈萍曹湖军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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