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Method for synthesizing KSi hydrogen storage alloy

A hydrogen storage alloy, potassium silicon technology, applied in the production of hydrogen, metal silicide, etc., can solve the problems of poor reversibility, complicated purification steps, unfavorable large-scale production, etc., and achieve the effect of excellent performance

Inactive Publication Date: 2012-11-07
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although coordination complex hydrides and chemical hydrogen storage materials have high gravimetric hydrogen storage density (6-13 wt%), their application is limited by high dehydrogenation temperature, slow dehydrogenation rate and Problems such as poor reversibility
[3,4] Among traditional metal hydrides, except for magnesium and magnesium-based alloy hydrides, the hydrogen storage capacity of other metal hydrides is generally low (< 2 wt%)
[5-7] Although magnesium and magnesium-based alloy hydrides have high hydrogen storage capacity (4-7 wt%), their high dehydrogenation reaction temperature and poor dehydrogenation kinetics hinder their practical application.
[13] Chemical synthesis of KSi alloy requires low temperature and organic solvents, high cost, complicated purification steps, and is not conducive to large-scale production

Method used

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  • Method for synthesizing KSi hydrogen storage alloy
  • Method for synthesizing KSi hydrogen storage alloy
  • Method for synthesizing KSi hydrogen storage alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Synthesis of KSi alloy

[0034]Under an inert gas glove box, the metal potassium block material and silicon powder (300 mesh) are mixed according to the molar ratio of 1.02:1 and then loaded into the small reaction chamber of the reactor. The structure of the reactor is as follows: figure 1 shown. 5 MPa argon gas was introduced into the reactor, and the temperature was gradually raised to 500 °C at a rate of 1 °C / min. After being kept at 500 °C for 3 days, the temperature was lowered to 150 °C, the pressure was lowered to 0.1 MPa and kept for 2 hours. Finally, after cooling down to room temperature with the furnace, the reactor is opened in an inert gas glove box and the small reaction chamber is taken out to obtain the KSi alloy. The XRD pattern of the synthesized KSi alloy is as follows figure 2 (a),

[0035] (2) KSi alloy hydrogen absorption reaction

[0036] The KSi alloy is kept at 150 ℃ for 24 hours under 4 MPa hydrogen pressure to obtain KSiH 3 . ...

Embodiment 2

[0040] (1) Synthesis of KSi alloy

[0041] Under an inert gas glove box, the metal potassium bulk material and silicon powder (300 mesh) were mixed at a molar ratio of 1.05:1 and then loaded into the small reaction chamber of the reactor. 6 MPa argon gas was introduced into the reactor, and the temperature was gradually raised to 500 °C at a rate of 1 °C / min. After being kept at 500 °C for 3 days, the temperature was lowered to 200 °C, the pressure was lowered to 0.1 MPa and kept for 2 hours. Finally, after cooling down to room temperature with the furnace, the reactor is opened in an inert gas glove box and the small reaction chamber is taken out to obtain the KSi alloy. The XRD pattern of the synthesized KSi alloy is as follows Figure 5 (a),

[0042] (2) KSi alloy hydrogen absorption reaction

[0043] KSiH is obtained by keeping the KSi alloy at 200 °C for 24 hours under 4 MPa hydrogen pressure. 3 . QUR 3 The XRD pattern such as Figure 5 (b) shown.

[0044] (3) Hy...

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Abstract

The invention belongs to the technical field of preparation of materials, and particularly discloses a method for synthesizing KSi hydrogen storage alloy. According to the method, volatilization of metallic potassium at high temperature can be inhibited by using high-pressure inert gas, and the KSi alloy is synthesized by solid and liquid reaction and self-purification in the temperature reducing process. The method specifically comprises the following steps of: feeding mixture of metallic potassium and silica powder into a reactor with a self-refluxing structure under the condition that air is isolated; and in high-temperature inert gas atmosphere, raising temperature in the reactor to 500 DEG C, preserving heat for three days, reducing temperature to 150 DEG C, reducing pressure to normal pressure, and preserving heat for two hours. By the method, the KSi hydrogen storage alloy is synthesized; and the method has the advantages of simplicity and convenience in reaction, high yield and the like. The synthesized KSi alloy is a hydrogen storage material with excellent performance, hydrogenation can be performed at temperature of 150 DEG C and under the hydrogen pressure of 4MPa, dehydrogenation can be performed at the temperature of 250 DEG C and under the pressure of 0.1MPa, and the method is excellent in reverse circulation performance.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and specifically relates to a method for synthesizing a potassium-silicon (KSi) hydrogen-storage alloy, in particular to a method for synthesizing a high-purity potassium-silicon (KSi) hydrogen-storage alloy by using high-pressure assistance and self-purification technology. Background technique [0002] Hydrogen energy has become one of the hotspots of green energy research due to its high combustion efficiency and non-polluting combustion products. There are three main storage methods for hydrogen energy: high-pressure gaseous hydrogen storage, low-temperature liquid hydrogen storage and solid-state hydrogen storage. Compared with traditional high-pressure gaseous hydrogen storage and low-temperature liquid hydrogen storage, solid-state hydrogen storage has the advantages of high storage density, safety, and portability, and is an efficient hydrogen storage technology. [1,2] Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/06C01B3/02
Inventor 孙大林方方李永涛
Owner FUDAN UNIV