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A lithium borohydride/alkali metal aluminum hydride/calcium carbide composite hydrogen storage material and its preparation method

A technology of aluminum hydride and lithium borohydride, applied in chemical instruments and methods, non-metallic elements, hydrogen, etc., can solve problems such as poor reversible hydrogen absorption performance, loss of effective hydrogen storage capacity, and reduced activation energy of hydrogen desorption. Achieve good reversible performance, low hydrogen release temperature, and improve hydrogen storage performance

Active Publication Date: 2019-01-11
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Li in lithium borohydride + ion or [BH 4 - ] group element substitution can effectively reduce the hydrogen desorption temperature, but the reversible hydrogen absorption performance is often poor
Adding catalysts (such as carbon materials, metal oxides or halides, etc.) to lithium borohydride can reduce the activation energy of hydrogen desorption, but nanoscale catalysts with good catalytic effects are often complicated to prepare and expensive
Reducing the particle size or grain size of lithium borohydride to the nanometer scale by using nano-confinement method can greatly improve the hydrogen desorption / reabsorption kinetic performance of lithium borohydride, but its effective hydrogen storage capacity will be larger. loss

Method used

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  • A lithium borohydride/alkali metal aluminum hydride/calcium carbide composite hydrogen storage material and its preparation method
  • A lithium borohydride/alkali metal aluminum hydride/calcium carbide composite hydrogen storage material and its preparation method
  • A lithium borohydride/alkali metal aluminum hydride/calcium carbide composite hydrogen storage material 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 ), lithium aluminum hydride (LiAlH 4 ) and calcium carbide powder and mixed; the LiBH 4 , LiAlH 4 and CaC 2 The mixed powder is poured into a 250mL stainless steel ball mill tank, and 5 atm argon is filled into the ball mill tank; the mixed powder is milled for 10 hours with a planetary ball mill (ball-to-material ratio 20:1, speed 400rpm), namely The 2LiBH can be obtained 4 +LiAlH 4 +0.5CaC 2 Composite hydrogen storage materials. Depend on figure 1 It can be seen that the resulting 2LiBH 4 +LiAlH 4 +0.5CaC 2 The composite hydrogen storage material begins to release hydrogen at 110°C, and basically ends at 440°C, with a hydrogen release amount of 6.3wt.%. Compared to pure LiBH 4 The hydrogen is released slowly from 320°C, and the amount of hydrogen released...

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 , sodium aluminum hydride (NaAlH 4 ) and CaC 2 powder and mix; LiBH 4 , NaAlH 4 and CaC 2 The mixed powder is poured into a stainless steel ball mill tank with a volume of 250 mL, and 1 atm argon gas is filled into the ball mill tank; the mixed powder is ball milled for 8 hours using a planetary ball mill (ball-to-material ratio 30:1, speed 400 rpm), namely The 2LiBH can be obtained 4 +NaAlH 4 +0.7CaC 2 Composite hydrogen storage materials. Depend on image 3 It can be seen that the resulting 2LiBH 4 +NaAlH 4 +0.7CaC 2 The composite hydrogen storage material has obvious hydrogen desorption phenomenon at 200°C, and the hydrogen desorption is basically completed at 570°C, with a hydrogen desorption amount of 6.1wt.%.

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 , LiAlH 4 and CaC 2 powder and mix; LiBH 4 , LiAlH 4 and CaC 2 The mixed powder is poured into a stainless steel ball mill tank with a volume of 250 mL, and 1 atm argon gas is filled into the ball mill tank; the mixed powder is ball milled for 8 hours using a planetary ball mill (ball-to-material ratio 30:1, speed 400 rpm), namely The 2LiBH can be obtained 4 +LiAlH 4 +CaC 2 Composite hydrogen storage materials. Depend on Figure 4 It can be seen that the resulting 2LiBH 4 +LiAlH 4 +CaC 2 The composite hydrogen storage material begins to release hydrogen at 100°C, and basically ends at 425°C, with a hydrogen release amount of 5.3wt.%.

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Abstract

The invention discloses a lithium borohydride / alkali metal aluminum hydride / calcium carbide composite hydrogen storage material 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, alkali metal aluminum hydride and calcium carbide, wherein the mole ratio of lithium borohydride to alkali metal aluminum hydride is 2:1, the additive amount of calcium carbide is 12-25mol%, and alkali metal aluminum hydride is lithium aluminum hydride or sodium aluminum hydride. During preparation, calcium carbide with the purity not lower than 97% is ground into powder with the granularity smaller than 500 mu m, lithium borohydride, alkali metal aluminum hydride and the calcium carbide powder are weighed in proportion and mixed, and finally, the mixed powder is subjected to ball-milling treatment through a planetary ball mill. The composite hydrogen storage material has the advantages as follows: a preparation process of the composite hydrogen storage material is simple, safe and reliable, the composite hydrogen storage material has low hydrogen desorption temperature, high hydrogen desorption and good reversible hydrogen reabsorption performance, the hydrogen storage performance of the material is improved through calcium carbide, raw materials are widely sourced, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, and in particular relates to a lithium borohydride / alkali metal aluminum hydride / calcium carbide composite hydrogen storage material and a preparation method thereof. Background technique [0002] The development and utilization of new renewable energy is the only way to solve the energy crisis and environmental pollution. Hydrogen energy has the advantages of high calorific value, clean combustion products, and abundant reserves. It is the best substitute for traditional fossil energy such as coal, oil, and natural gas. It is considered to be an ideal secondary energy source for human beings in the future. The development and utilization of hydrogen energy is a huge system engineering. How to realize the safe, efficient and economical storage of hydrogen is the key to the large-scale utilization of hydrogen energy. Compared with gaseous and liquid hydrogen storage methods, us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/00
CPCC01B3/001Y02E60/32
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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