Composite hydrogen storage material containing calcium carbide and preparation method thereof

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: 2017-05-24
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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  • Composite hydrogen storage material containing calcium carbide and preparation method thereof
  • Composite hydrogen storage material containing calcium carbide and preparation method thereof
  • Composite hydrogen storage material containing calcium carbide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The commercially available irregular small block calcium carbide (CaC 2 , The purity is not less than 97%) mechanically crushed into powder with a particle size of less than 500μm; according to the 2:1:0.5 molar ratio, weigh lithium borohydride (LiBH 4 ), magnesium hydride (MgH 2 ) And calcium carbide powder and mixed; LiBH 4 , MgH 2 And CaC 2 Pour the mixed powder into a stainless steel ball mill tank with a volume of 250mL, and fill the ball mill tank with 1atm argon gas; use a planetary ball mill to ball mill the mixed powder for 10 hours (ball-to-material ratio 20:1, speed 400rpm), that is Available 2LiBH 4 +MgH 2 +0.5CaC 2 Composite hydrogen storage material. by figure 1 It can be seen that the obtained 2LiBH 4 +MgH 2 +0.5CaC 2 The composite hydrogen storage material starts to release hydrogen at 330°C and basically ends at 430°C, and the amount of hydrogen released reaches 6.8wt.%. In comparison, pure LiBH 4 The hydrogen desorption temperature is high and the hydrog...

Embodiment 2

[0026] The commercially available irregular small block calcium carbide (CaC 2 , The purity is not less than 97%) mechanically crushed into powder with a particle size of less than 500μm; LiBH is respectively weighed 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 Pour the mixed powder into a stainless steel ball mill tank with a volume of 250mL, and fill the ball mill tank with 1atm argon gas; use a planetary ball mill to ball mill the mixed powder for 10 hours (ball-to-material ratio 20:1, speed 400rpm), that is Available 2LiBH 4 +MgF 2 +0.7CaC 2 Composite hydrogen storage material. by image 3 It can be seen that the obtained 2LiBH 4 +MgF 2 +0.7CaC 2 The composite hydrogen storage material starts to release hydrogen at 300°C and basically ends at 430°C, and the amount of hydrogen released reaches 4.5wt.%.

Embodiment 3

[0028] The commercially available irregular small block calcium carbide (CaC 2 , The purity is not less than 97%) mechanically crushed into powder with a particle size of less than 500μm; LiBH is respectively weighed according to the 2:1:1 molar ratio 4 , MgH 2 And CaC 2 Powder and mix; LiBH 4 , MgH 2 And CaC 2 Pour the mixed powder into a stainless steel ball mill tank with a volume of 250mL, 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). Obtain the 2LiBH 4 +MgH 2 +CaC 2 Composite hydrogen storage material. by Figure 4 It can be seen that the obtained 2LiBH 4 +MgH 2 +CaC 2 The composite hydrogen storage material starts to release hydrogen at 325°C and basically ends at 420°C, and the amount of hydrogen released reaches 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 specifically relates to a composite hydrogen storage material containing calcium carbide and a preparation method thereof. Background technique [0002] Facing the dual 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 source for mankind. 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 storage of hydrogen has the advantages of high hydrogen storage density and good safety. Alkali metal or alkaline ...

Claims

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Application Information

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Patent Type & Authority Applications(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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