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Method for synthesizing lithium borohydride

A lithium borohydride and synthesis method technology, which is applied in the synthesis of lithium borohydride and the preparation of lithium borohydride, can solve the problems of low product purity, complicated process, and harsh synthesis conditions, and achieve high purity, simple preparation process, and reaction short time effect

Active Publication Date: 2014-07-16
SICHUAN INST OF MATERIALS & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a synthetic method for lithium borohydride in view of the shortcomings of existing lithium borohydride preparation methods such as complex processes and harsh synthesis conditions.
The present invention solves the traditional method for preparing lithium borohydride (LiBH 4 ) has disadvantages such as complex process, harsh synthesis conditions, and low product purity.

Method used

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  • Method for synthesizing lithium borohydride
  • Method for synthesizing lithium borohydride
  • Method for synthesizing lithium borohydride

Examples

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Effect test

Embodiment 1

[0042] In a glove box filled with argon, weigh LiH and MgB at a molar ratio of 2:1 2 Two kinds of raw material powders, then add LiH and MgB 2 3 mol% NbF in the total mixture 5 The powder was poured into a stainless steel ball mill tank with a volume of 100 ml, and ball milled with a planetary ball mill for 2 h at a ball-to-material ratio of 40:1, a speed of 400 rpm, and an argon atmosphere, and mechanically mixed to obtain the product after ball milling , its XRD pattern is as figure 1 shown. Put the ball-milled product into the reactor, vacuumize it, place the reactor in a heating furnace to heat the reactor to 400°C, then quickly fill the reactor with hydrogen with a purity of 99.99% to 7 MPa, and carry out Hydrogen absorption reaction for 15 min. Its hydrogen absorption reaction curve is as follows figure 2 It can be seen from the figure that the hydrogen absorption is basically completed after the reaction is carried out for about 10 minutes. Afterwards, the reacto...

Embodiment 2

[0044] In a glove box filled with argon, weigh LiH and MgB at a molar ratio of 2:1 2 Two kinds of raw material powders, then add LiH and MgB 2 3 mol% TiF in the total mixture 3 The powder was poured into a stainless steel ball mill tank with a volume of 100 ml, and was milled with a planetary ball mill for 5 h at a ball-to-material ratio of 30:1, a rotational speed of 350 rpm, and an argon atmosphere, and mechanically mixed to obtain the milled powder. product, its XRD pattern is as figure 1 shown. Put the ball-milled mixture into the reactor, vacuumize it, place the reactor in a heating furnace to heat the reactor to 400°C, and then quickly fill the reactor with hydrogen gas with a purity of 99.99% to 6.5 MPa to carry out Hydrogen absorption reaction for 20 min. Its hydrogen absorption reaction curve is as follows figure 2 It can be seen from the figure that the hydrogen absorption is basically completed after the reaction is carried out for about 14 minutes. Afterward...

Embodiment 3

[0046] In a glove box filled with argon, weigh LiH and MgB at a molar ratio of 2:1 2 Two kinds of raw material powders, then add LiH and MgB 2 5 mol% NbF in the total mixture 5 The powder is poured into a stainless steel ball mill tank with a volume of 100 ml, and ball milled with a planetary ball mill for 5 h at a ball-to-material ratio of 40:1, a speed of 400 rpm, and an argon atmosphere, and mechanically mixed. The mixture after ball milling The XRD pattern such as figure 1 shown. Put the ball-milled mixture into the reactor, vacuumize it, place the reactor in a heating furnace to heat the reactor to 450°C, and then quickly fill the reactor with hydrogen gas with a purity of 99.99% to 7 MPa to carry out Hydrogen absorption reaction for 15 min. Its hydrogen absorption reaction curve is as follows figure 2 It can be seen from the figure that the hydrogen absorption is basically completed after the reaction is carried out for about 8 minutes. Afterwards, the reactor is ...

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Abstract

The invention discloses a method for synthesizing lithium borohydride. The method aims at solving the problems that an existing method for preparing lithium borohydride is complex in technology, strict in synthesis condition and the like. The method comprises the following steps that in a protective atmosphere, after lithium hydride, magnesium diboride and a catalyst are mixed according to a ratio, ball-milling treatment is conducted, and a product is obtained after ball-milling treatment; a hydrogen absorption reaction is conducted on the product which is obtained after ball-milling treatment, so that a mixture of the lithium borohydride and magnesium hydride is obtained and is recorded as a reaction product; the magnesium hydride and the lithium borohydride in the reaction product are separated, so that the lithium borohydride is obtained. The method overcomes the shortages that a traditional method for preparing the lithium borohydride is complex in technology and strict in synthesis condition and the purity of the product is low and the like. The method is simple, gentle in reaction condition and short in reaction time. Synthesized LiBH4 is high in yield and purity. Meanwhile, through the method, the production period of the LiBH4 can be shortened, the production cost is reduced, the lithium borohydride can be produced in a large scale industrially, and application of the lithium borohydride is facilitated.

Description

technical field [0001] The invention relates to the field of material synthesis, in particular to a method for synthesizing lithium borohydride. The invention can be used for the preparation of lithium borohydride, and has the advantages of simple process, mild reaction conditions, short reaction time, high yield and high purity. Background technique [0002] Lithium borohydride (LiBH 4 ), can be used as a hydrogen source, a high-capacity hydrogen storage material, and it is also one of the most important reducing agents in organic chemistry, and in industry, it can be used in bleached wood pulp and electroless plating. uses and promising materials. However, LiBH 4 In practical applications, there are problems such as complex synthesis process, harsh synthesis conditions, low purity of synthetic products, and high synthesis cost, which makes its production cost high and greatly limits its application. [0003] In 1953, Schlesinger and Brown first used sodium borohydride ...

Claims

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Application Information

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IPC IPC(8): C01B6/21
Inventor 寇化秦桑革李嵘黄志勇罗文华杜杰闫霞艳
Owner SICHUAN INST OF MATERIALS & TECH
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