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Preparation method of lithium borohydride

A technology of lithium borohydride and lithium hydride, which is applied in the field of preparation of light metal coordination hydrides, can solve the problems of volatile organic solvents, hazards, toxicity, etc., and achieve the effects of lower reaction temperature, simple operation, and mild reaction

Inactive Publication Date: 2010-11-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many disadvantages in this preparation method: firstly, the organic solvent is usually volatile and has certain toxicity; secondly, diborane is a highly toxic gas, and it is very harmful if leaked; finally, the prepared LiBH 4 It is a crystalline product with organic solvents, which needs to be vacuum dried to remove organic solvents

Method used

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  • Preparation method of lithium borohydride
  • Preparation method of lithium borohydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Under argon protection, lithium hydride and elemental boron are mixed uniformly in a molar ratio of 1:1 to obtain a mixture of lithium hydride and boron;

[0027] (2) Under the protection of argon, put the above-mentioned mixture of lithium hydride and boron together with stainless steel beads into a high-pressure ball milling tank with a ball-to-material ratio of 60:1, vacuumize the high-pressure ball milling tank, and then fill the high-pressure ball milling tank with Inject pressure and be the hydrogen of 10MPa, place the ball mill pot on the ball mill for mechanical ball milling for 10 hours to obtain the mixed material;

[0028] (3) Under the protection of argon, place the above-mentioned mixed material in a high-pressure reactor, fill the reactor with hydrogen at a pressure of 35 MPa, and then keep the temperature at 400° C. for 10 hours to obtain lithium borohydride.

[0029] The X-ray diffraction pattern of above-mentioned lithium borohydride is as figure 1...

Embodiment 2

[0031] (1) Under argon protection, lithium hydride and elemental boron are mixed uniformly in a molar ratio of 1:1 to obtain a mixture of lithium hydride and boron;

[0032] (2) Under the protection of argon, put the above-mentioned mixture of lithium hydride and boron together with stainless steel beads into a high-pressure ball milling tank with a ball-to-material ratio of 60:1, vacuumize the high-pressure ball milling tank, and then fill the high-pressure ball milling tank with Inject pressure and be the hydrogen of 10MPa, place the ball mill pot on the ball mill for mechanical ball milling for 10 hours to obtain the mixed material;

[0033] (3) Under the protection of argon, place the above-mentioned mixed material in a high-pressure reactor, fill the reactor with hydrogen at a pressure of 35 MPa, and keep the temperature at 500° C. for 10 hours to obtain lithium borohydride.

[0034] The X-ray diffraction pattern of above-mentioned lithium borohydride is as figure 1 ; f...

Embodiment 3

[0036] (1) Under argon protection, lithium hydride and elemental boron are mixed uniformly in a molar ratio of 1:1 to obtain a mixture of lithium hydride and boron;

[0037] (2) Under the protection of argon, put the above-mentioned mixture of lithium hydride and boron together with stainless steel beads into a high-pressure ball milling tank with a ball-to-material ratio of 60:1, vacuumize the high-pressure ball milling tank, and then fill the high-pressure ball milling tank with Inject pressure and be the hydrogen of 10MPa, place the ball mill pot on the ball mill for mechanical ball milling for 10 hours to obtain the mixed material;

[0038] (3) Under the protection of argon, place the above-mentioned mixed material in a high-pressure reactor, fill the reactor with hydrogen at a pressure of 35 MPa, and then keep the temperature at 300° C. for 10 hours to obtain lithium borohydride.

[0039] The X-ray diffraction pattern of above-mentioned lithium borohydride is as figure 1...

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Abstract

The invention discloses a preparation method of lithium borohydride, which comprises the following steps: (1) uniformly mixing lithium hydride with boron and obtaining mixture of the lithium hydride and the boron; (2) carrying out mechanical ball milling on the mixture of the lithium hydride and the boron in hydrogen at the pressure of 8MPa-12MPa and obtaining mixed materials; and (3) leading the mixed materials to react at the reaction temperature of 300 DEG C-500 DEG C in the hydrogen at the pressure of 30MPa-35MPa to obtain the lithium borohydride. The method does not use an organic solvent, diborane and other toxic substances, thereby being safe and environment-friendly. The method can reduce the reaction temperature and realize mild reaction with simple operation and low cost and is applied to industrial production.

Description

technical field [0001] The invention relates to the field of preparation of light metal coordination hydrides, in particular to a preparation method of lithium borohydride. Background technique [0002] With the continuous consumption of fossil fuels and the resulting environmental pollution, people are forced to develop new, clean and renewable energy sources. Hydrogen energy, as a new type of energy carrier, has become the research object of many scientists due to its clean, renewable and many other advantages. At present, the biggest challenge facing the practical application of hydrogen energy is: how to find a hydrogen storage material with high storage density, low cost, and fast hydrogen absorption and desorption capabilities. Traditional rare earth metal hydrides have been used as hydrogen storage materials for quite a long time, but the mass hydrogen storage density of traditional rare earth metal hydrides basically does not exceed 2%, which is far from meeting the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B6/21
Inventor 陈如柑王新华陈立新李寿权葛红卫陈长聘
Owner ZHEJIANG UNIV