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A cheap and large-scale method for preparing nitrogen-based metal compound hydrogen storage materials

A hydrogen storage material and base metal technology, applied in the production of hydrogen and other directions, can solve the problems of difficulty in practicalization and popularization, and achieve the effects of cost reduction, simple process, and strong safety and operability.

Active Publication Date: 2019-04-23
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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  • A cheap and large-scale method for preparing nitrogen-based metal compound hydrogen storage materials
  • A cheap and large-scale method for preparing nitrogen-based metal compound hydrogen storage materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: prepare Li-N-H (LiNH 2 -LiH) system

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

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

[0018] (3) Take out the sample mixed in step (2) and place it in a pressure-resistant reactor for ammoniation, the ammoniation temperature is between 50 and 350°C; the time is 1-50h; the steps can also be repeated for a long time (>50h) (2) Until all metallic lithium is transformed into lithium amide.

[0019] (4) Perform a temperature-programmed (fixed heating rate) deamination test (TPD-MS) on the lithium amide sample obtained after ammoniation in step (3) to determine the deamina...

Embodiment 2

[0022] Embodiment 2: prepare Li-Mg-N-H (Mg (NH 2 ) 2 -nLiH) system

[0023] (1) Take 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 jar, followed by injection of ammonia gas (>5atm) or liquid ammonia.

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

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

[0026] (4) The temperature-programmed deamination test (TPD-MS) was performed on the samples obtained after ...

Embodiment 3

[0029] Embodiment 3: prepare KH modified Li-Mg-N-H (Mg(NH2 ) 2 -nLiH-yKH) system

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

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

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

[0033] (...

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Abstract

The invention discloses a large-scale method for preparing a nitrogen-based metal compound hydrogen storage material. Using one or more mixtures of metal element, metal hydride or metal nitrogen-based compound as the main material, and using other compounds as additives, the nitrogen-based metal compound for hydrogen storage is obtained by uniform mixing, calcination, deamination, and hydrogenation Material. The metal nitrogen-based compound may be one or a mixture of two or more of metal amido compounds, metal imino compounds or metal nitrogen compounds. The metal element is a main group metal of Group 1-3 or an early transition metal. The nitrogen-based metal compound hydrogen storage material can be prepared safely, cheaply and on a large scale by using the method, so that the preparation cost of the nitrogen-based metal compound hydrogen storage material is greatly reduced. Cheap hydrogen storage materials have extremely important guiding value for the civil and practical application 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 cheap large-scale preparation of nitrogen-based metal compound hydrogen storage materials. Background technique [0002] Carbon energy materials such as coal, oil, and natural gas are increasingly depleted and accompanied by serious environmental pollution during their use. The problem of energy depletion and large amount of environmental pollution forces people to develop new sustainable green energy sources, such as wind energy, solar energy, biomass energy, hydrogen energy, etc. Among them, hydrogen energy is due to its abundant reserves and high mass energy density (142MJkg -1 ), the by-product (water) is environmentally friendly and pollution-free and is favored by people. Therefore, vigorously developing hydrogen energy will help to alleviat...

Claims

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Application Information

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Patent Type & Authority Patents(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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