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A kind of composite hydrogen storage material containing calcium carbide and its preparation method

A hydrogen storage material, calcium carbide technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of complex preparation process of nano-catalysts, reduced hydrogen desorption activation energy, poor reversibility, etc., and achieve good reversible hydrogen absorption. performance, improvement of hydrogen storage performance, effect of low hydrogen desorption temperature

Active Publication Date: 2019-05-17
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding catalysts (such as carbonaceous materials, transition metal oxides or fluorides, etc.) to lithium borohydride can reduce the activation energy of hydrogen desorption, but the reversibility is poor, and the preparation process of nanocatalysts with good catalytic effects is complicated and expensive. high

Method used

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  • A kind of composite hydrogen storage material containing calcium carbide and its preparation method
  • A kind of composite hydrogen storage material containing calcium carbide and its preparation method
  • A kind of composite hydrogen storage material containing calcium carbide and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Commercially available irregular small calcium carbide (CaC 2 , purity not less than 97%) mechanically pulverized into a powder with a particle size of less than 500 μm; weigh lithium borohydride (LiBH 4 ), magnesium hydride (MgH 2 ) and calcium carbide powder and mixed; the LiBH 4 , MgH 2 and CaC 2 The mixed powder was poured into a 250mL stainless steel ball milling jar, and 1 atm argon was filled into the ball milling jar; the mixed powder was milled for 10 hours with a planetary ball mill (ball-material ratio 20:1, speed 400rpm), namely The 2LiBH can be obtained 4 +MgH 2 +0.5CaC 2 Composite hydrogen storage materials. Depend on figure 1 It can be seen that the resulting 2LiBH 4 +MgH 2 +0.5CaC 2 The composite hydrogen storage material begins to release hydrogen at 330°C, and basically ends at 430°C, with a hydrogen release amount of 6.8wt.%. Compared to pure LiBH 4 The hydrogen release temperature is high and the hydrogen release is slow, and the hydroge...

Embodiment 2

[0026] Commercially available irregular small calcium carbide (CaC 2 , purity not less than 97%) mechanically pulverized into a powder with a particle size of less than 500 μm; weigh LiBH respectively according to the molar ratio of 2:1:0.7 4 , magnesium fluoride (MgF 2 ) and CaC 2 powder and mix; LiBH 4 , MgF 2 and CaC 2 The mixed powder was poured into a 250mL stainless steel ball milling jar, and 1 atm argon was filled into the ball milling jar; the mixed powder was milled for 10 hours with a planetary ball mill (ball-material ratio 20:1, speed 400rpm), namely The 2LiBH can be obtained 4 +MgF 2 +0.7CaC 2 Composite hydrogen storage materials. Depend on image 3 It can be seen that the resulting 2LiBH 4 +MgF 2 +0.7CaC 2 The composite hydrogen storage material begins to release hydrogen at 300°C, and basically ends at 430°C, with a hydrogen release amount of 4.5wt.%.

Embodiment 3

[0028] Commercially available irregular small calcium carbide (CaC 2 , purity not less than 97%) mechanically pulverized into powders with a particle size of less than 500 μm; weigh LiBH respectively according to the molar ratio of 2:1:1 4 , MgH 2 and CaC 2 powder and mix; LiBH 4 , MgH 2 and CaC 2 Pour the mixed powder into a 250mL stainless steel ball mill tank, and fill the ball mill tank with 2atm nitrogen; use a planetary ball mill to mill the mixed powder for 8 hours (ball-to-material ratio 30:1, speed 400rpm), and then Obtain the 2LiBH as described 4 +MgH 2 +CaC 2 Composite hydrogen storage materials. Depend on Figure 4 It can be seen that the resulting 2LiBH 4 +MgH 2 +CaC 2 The composite hydrogen storage material begins to release hydrogen at 325°C, and basically ends at 420°C, with a hydrogen release amount of 4.7wt.%.

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Abstract

The invention discloses a composite hydrogen storage material containing calcium carbide and a preparation method thereof and belongs to the technical field of hydrogen storage materials. The composite hydrogen storage material is prepared from lithium borohydride, magnesium hydride (or magnesium fluoride) and calcium carbide, wherein the malar ratio of the lithium borohydride to the magnesium hydride (or magnesium fluoride) is 2 to 1, and the adding amount of the calcium carbide is 12-25 mol%. During preparation, the calcium carbide with the purity not lower than 97% is smashed into powder with the particle size smaller than 500 microns, the lithium borohydride, the magnesium hydride (or magnesium fluoride) and the calcium carbide are weighed in proportion and are mixed, and finally the mixed powder is subjected to ball-grinding treatment by adopting a planetary ball mill. The composite hydrogen storage material has the advantages that the hydrogen storage performance of the material is improved by utilizing the calcium carbide, and the raw materials are wide in source and low in cost. The provided composite hydrogen storage material is simple in preparation process, safe and reliable and has low hydrogen release temperature, high hydrogen release amount and good reversibility.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, and in particular relates to a composite hydrogen storage material containing calcium carbide and a preparation method thereof. Background technique [0002] Facing the double test of energy crisis and environmental pollution, human beings urgently need to develop and utilize new renewable energy. Among them, hydrogen energy has the advantages of high calorific value, completely pollution-free combustion products, and abundant reserves. It is an ideal substitute for traditional fossil energy and is considered to be an ideal secondary energy for human beings. The development of hydrogen storage technology is crucial to the large-scale utilization of hydrogen energy. Compared with gaseous and liquid hydrogen storage methods, the use of hydrogen storage materials for solid-state storage of hydrogen has the advantages of high hydrogen storage density and good safety. Alkali metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/00
CPCC01B3/0078Y02E60/32
Inventor 柳东明张月顾润斯庭智李永涛张庆安
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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