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Method for improving the thermodynamic properties of metal nitrogen-based compound hydrogen storage materials

A technology of thermodynamic properties and hydrogen storage materials, applied in the production of hydrogen and other directions, can solve problems such as low entropy change, and achieve the effects of improving process, reducing cost, and shortening diffusion distance

Active Publication Date: 2017-02-01
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

However, its entropy change must be relatively low compared to metal hydrogenation (probably because it has a similar melting state during the hydrogen absorption and dehydrogenation process), so its corresponding enthalpy value is required to be reduced to a lower level to meet the working requirements of the fuel cell.

Method used

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  • Method for improving the thermodynamic properties of metal nitrogen-based compound hydrogen storage materials
  • Method for improving the thermodynamic properties of metal nitrogen-based compound hydrogen storage materials
  • Method for improving the thermodynamic properties of metal nitrogen-based compound hydrogen storage materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: LiI modulation Li-Mg-N-H system thermodynamics

[0019] (1) LiNH produced by Li-Mg-N-H system 2 Add the corresponding amount of LiI, such as: 1mol4Mg(NH 2 ) 2 2mol LiNH produced in -6LiH system 2 (Reaction2), then the amount of LiI added should be 1mol, and this ratio is easy to form new product Li 3 (NH 2 ) 2 I(Reaction3).

[0020]

[0021]

[0022] (2) After adding the corresponding raw materials according to the ratio described in step (1), place them on a planetary ball mill at 100-200rpm and mix evenly.

[0023] (3) The sample mixed in step (2) is heated for dehydrogenation, and the dehydrogenation temperature is 100-250°C.

[0024] (4) obtained high platform and low dehydrogenation enthalpy value such as figure 2 with image 3 shown.

[0025] Conclusion: The addition of LiI can reduce the reaction enthalpy of Li-Mg-N-H system from 40 to 33.3 kJ / mol, which indicates that the theoretical dehydrogenation temperature of 1 atmosphere hydroge...

Embodiment 2

[0026] Example 2: LiBH 4 Modulating Thermodynamics of Li-Mg-N-H System

[0027] (1) LiNH produced by Li-Mg-N-H system 2 Add the corresponding amount of LiBH 4 , such as: 1mol6Mg(NH 2 ) 2 In -9LiH system, 3molLiNH is produced 2 (Reaction4), the added LiBH 4 The amount should be 1, 2, 3 mol, this ratio is easy to form a new product Li 4 BN 3 h 10 , Li 3 BN 2 h 8 , Li 2 BNH6 (Reaction5).

[0028]

[0029]

[0030] (2) After adding the corresponding raw materials according to the ratio described in step (1), place them on a planetary ball mill at 100-400rpm and mix evenly.

[0031] (3) The sample mixed in step (2) is heated for dehydrogenation, and the dehydrogenation temperature is 100-250°C.

[0032] (4) The obtained high dehydrogenation platform is as figure 2 shown.

[0033] Conclusion note: LiBH 4 The addition of Li-Mg-N-H system can reduce the reaction enthalpy from 40 to about 25kJ / mol, which indicates that the theoretical dehydrogenation temperature...

Embodiment 3

[0034] Example 3: LiBr modulating Li-N-H system thermodynamics

[0035] (1) According to a certain ratio of 1:1 to 1:6 (LiNH 2 :LiBr) samples were placed on a planetary ball mill at 100-400rpm and mixed evenly.

[0036] (2) Heat the sample mixed in step (1) to dehydrogenate, and the dehydrogenation temperature is 100-300°C (Reaction6&7).

[0037]

[0038]

[0039] (3) The obtained high platform such as Figure 4 shown.

[0040] Conclusion: The addition of LiBr can increase the plateau of the Li-N-H system to 43psi (280°C), which indicates that the addition of LiBr can reduce the theoretical dehydrogenation temperature of the Li-N-H system at 1 atmosphere of hydrogen pressure.

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Abstract

The invention discloses a method for improving the thermodynamic performance of a metal nitrogen-based compound hydrogen storage material. This method can improve the thermodynamic enthalpy value of the metal nitrogen-based compound hydrogen storage material, reduce the dehydrogenation temperature of the material to a lower level, and raise the dehydrogenation platform to a higher level. Low dehydrogenation temperature and high dehydrogenation platform have extremely important guiding value and application value for hydrogen storage materials.

Description

technical field [0001] The invention relates to the application of the improvement of thermodynamic properties of metal nitrogen-based compound hydrogen storage materials in the field of hydrogen storage technology, especially the method of stabilizing products to improve thermodynamics. Background technique [0002] Due to the depletion of carbon energy materials such as coal, oil, natural gas, etc. and the environmental and pollution problems brought about by them in the process of use are becoming more and more serious. This forces us to develop new sustainable green energy such as wind energy, solar energy, biomass energy, hydrogen energy, etc. Among them, hydrogen energy is due to its high mass energy density (142M J kg -1 ) equivalent to gasoline (47M Jkg -1 ), with only water and heat as by-products, so hydrogen can help alleviate increasingly pressing environmental and social problems—including air pollution, hazards to human health and the global climate, and coun...

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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