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A kind of method of room temperature redox direct synthesis magnesium borohydride

A magnesium borohydride, direct technology, applied in the direction of borane/diborane hydride, etc., can solve the problems of high requirements for preparation conditions, high equipment requirements, high risk coefficient, etc., and achieves low price, high safety, source of rich effects

Active Publication Date: 2022-04-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires high temperature and high hydrogen pressure for a long time, high energy consumption, high risk factor, and high requirements for equipment
In addition, high-pressure hydrogen also increases the cost of synthesis, which is also not suitable for large-scale preparation
[0010] In summary, the current synthesis and preparation methods of magnesium borohydride require high preparation conditions and high preparation costs
In addition, it is difficult to obtain high-purity magnesium borohydride
Because of this, the large-scale application of magnesium borohydride as a hydrogen storage material is limited

Method used

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  • A kind of method of room temperature redox direct synthesis magnesium borohydride
  • A kind of method of room temperature redox direct synthesis magnesium borohydride
  • A kind of method of room temperature redox direct synthesis magnesium borohydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In a glove box with an argon atmosphere of 0.1MPa, boron oxide and magnesium hydride were weighed at a molar ratio of 1:5, mixed and put into a ball mill and placed in a vibration ball mill (QM-3C). The material ratio is 50:1, the ball milling speed is 1000 rpm, and the ball milling is directly carried out under the argon atmosphere for 1.25 hours to obtain a ball milling product. figure 1 The middle curve 1) is the FTIR spectrogram of the ball mill product, and the middle curve is 2150-2400cm -1 and 1100-1300cm -1 The corresponding Mg(BH 4 ) 2 The B-H bond stretching vibration (ν in the figure, the same below) and rocking vibration (δ in the figure, the same below) absorption peaks in the figure prove that magnesium borohydride has been successfully synthesized; Dissolve and filter to obtain a clear filtrate, use Schlenk technology to dry the filtrate to obtain a viscous magnesium borohydride solvent compound, then digest it with acid and configure it into a solutio...

Embodiment 2

[0062] In a glove box with an argon atmosphere of 0.1MPa, boron oxide and magnesium hydride were weighed at a molar ratio of 1:5, mixed and put into a ball mill and placed in a vibration ball mill (QM-3C). The material ratio is 50:1, the ball milling speed is 1000 rpm, and the ball milling is directly carried out under the argon atmosphere for 2.5 hours to obtain a ball milling product. figure 1 Middle curve 2) is the FTIR spectrogram of this ball mill product, in the curve 2150-2400cm -1 and 1100-1300cm -1 The corresponding Mg(BH 4 ) 2 The B-H bond stretching and rocking vibration absorption peaks in the figure prove that magnesium borohydride was successfully synthesized; the mixture was dissolved and filtered to obtain a clear filtrate using diethyl ether solvent distilled from sodium to obtain a viscous Magnesium borohydride solvent compound, digested with acid and configured into a solution, then use the inductively coupled plasma spectrometer to measure the concentrat...

Embodiment 3

[0064] In a glove box with an argon atmosphere of 0.1MPa, boron oxide and magnesium hydride were weighed at a molar ratio of 1:5, mixed and put into a ball mill and placed in a vibration ball mill (QM-3C). The material ratio is 50:1, the ball milling speed is 1000 rpm, and the ball milling is directly carried out under the argon atmosphere for 5 hours to obtain a ball milling product. figure 1 Middle curve 3) is the FTIR spectrogram of this ball mill product, in the curve 2150-2400cm -1 and 1100-1300cm -1 The corresponding Mg(BH 4 ) 2 The B-H bond stretching and rocking vibration absorption peaks in the figure prove that magnesium borohydride was successfully synthesized; the mixture was dissolved and filtered to obtain a clear filtrate using diethyl ether solvent distilled from sodium to obtain a viscous Magnesium borohydride solvent compound, digested with acid and configured into a solution, then use the inductively coupled plasma spectrometer to measure the concentratio...

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Abstract

The invention discloses a method for directly synthesizing magnesium borohydride through redox at room temperature. The method comprises: at room temperature, using a ball mill to perform solid-phase ball milling on the mixture of the reducing agent and the reduced material, and obtaining high-purity magnesium borohydride after purification and desolvation; the reducing agent includes relatively cheap magnesium hydride , magnesium and magnesium silicide; the material to be reduced is cheap boric oxide or boric acid, or a mixture of boric oxide and boric acid; Or carry out under hydrogen atmosphere. The invention has the advantages of simple process, controllable and adjustable reaction process, mild reaction conditions, low energy consumption, low cost, high output, no pollution, good safety and easy industrial production.

Description

technical field [0001] The invention relates to the field of magnesium borohydride synthesis, in particular to a method for directly synthesizing magnesium borohydride through redox at room temperature. Background technique [0002] Hydrogen is an excellent carrier for connecting various renewable energy sources. It has the advantages of rich content, high energy density, no pollution, and storage and transportation. Therefore, hydrogen energy is a high-quality secondary energy source that matches renewable primary energy sources, and it is one of the clean energy sources most likely to replace fossil fuels. The safe, efficient and low-cost solid-state hydrogen storage technology is the key to realize the practicality and scale of hydrogen energy. Metal borohydrides are a representative class of high-capacity solid hydrogen storage materials. Wherein magnesium borohydride has extremely high quality (14.9wt%), volume (145-147kg·cm -1 ) hydrogen storage density and moderate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B6/21
CPCC01B6/21C01P2002/82C01P2002/72C01P2002/85
Inventor 欧阳柳章朱用洋王辉刘江文朱敏
Owner SOUTH CHINA UNIV OF TECH
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