A kind of nano lithium borohydride, its in-situ preparation method and application

An in-situ preparation technology of lithium borohydride, which is applied in the field of hydrogen storage materials and nanomaterials, can solve the problems of low filling efficiency of carrier materials, low nanometerization effect, troublesome operation, etc., and achieve improved hydrogen absorption and desorption kinetics, high Capacity, the effect of inhibiting agglomeration

Active Publication Date: 2022-04-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is cumbersome to operate, and the filling efficiency of the carrier material is low, a large amount of lithium borohydride is aggregated and precipitated on the surface of the carrier material, and the nanonization effect is low, which is not conducive to application

Method used

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  • A kind of nano lithium borohydride, its in-situ preparation method and application
  • A kind of nano lithium borohydride, its in-situ preparation method and application
  • A kind of nano lithium borohydride, its in-situ preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1 prepares nano lithium borohydride

[0065] Add 2ml of butyllithium solution (2M / L) and 1ml of triethylamine borane dropwise into 70ml of n-hexane in an argon atmosphere glove box, stir and ultrasonically mix thoroughly, and then put them into a ventilated reactor. Fill the reactor with 50bar high-purity hydrogen, and heat and stir the reactor in an oil bath at 100°C for 24 hours. During the heating process, butyllithium (Li-C 4 h 9 ) hydrogen absorption to become lithium hydride (LiH), followed by triethylamine borane (C 6 h 18 BN) combined to form triethylamine adducts of lithium borohydride (LiBH 4 ·C 6 h 15 N).

[0066] After the reaction was completed, the reactor was moved into the glove box, and the reaction product was subjected to suction filtration, and the solid product (LiBH 4 / C 6 h 15 N), put the product in 500ml of n-hexane, stir and sonicate for 12h to remove the triethylamine adduct. Subsequently, the white powdery product was obta...

Embodiment 2

[0075] In this embodiment, graphene is selected as a carrier, and lithium borohydride nanoparticles are loaded between the graphene layers to realize the loading of nanometer lithium borohydride, so as to reduce the scale of lithium borohydride and obtain better dehydrogenation performance.

[0076] (1) According to the molar ratio of graphene and butyl lithium: 0.2:1, 0.4:1, 0.8:1 and 1.2:1 respectively, take 9.6mg, 19.2mg, 38.4mg and 57.6mg of graphene in argon Add 80ml of n-hexane into the atmosphere glove box, stir and ultrasonic for 2 hours to fully disperse the graphene, expand the graphene layer, which is conducive to the loading of lithium borohydride, and the ultrasonic power is 300W, to obtain graphene / n-hexane mixtures with different graphene contents.

[0077] (2) Add 2ml of butyllithium solution (2M / L) and 1ml of triethylamine borane dropwise into the graphene / n-hexane mixture prepared in step (1) in an argon atmosphere glove box, and stir and ultrasonically mix th...

Embodiment 3

[0091] In this example, graphene is selected as the carrier, nickelocene is selected as the transition metallocene as the catalyst precursor, and lithium borohydride nanoparticles and Ni nanoparticles are loaded between the graphene layers to achieve graphene confinement and nano-Ni catalysis. Synergistic modification for better dehydrogenation performance. The molar ratio of graphene to butyl lithium: 0.8:1, the molar ratio of nickelocene to butyl lithium: 0.05:1

[0092] (1) Get 38mg of graphene and 68mg of nickelocene and add in 80ml of n-hexane in an argon atmosphere glove box, stir and ultrasonic for 2h, the ultrasonic power is 300W, fully disperse graphene, unfold the graphene layer, nickelocene is in dissolved in n-hexane.

[0093] (2) Add 2ml of butyllithium solution (2M / L) and 1ml of triethylamine borane into the mixture of graphene, ferrocene and n-hexane dropwise in an argon atmosphere glove box, and stir and ultrasonically mix thoroughly Put it into a ventilated ...

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Abstract

The invention relates to the technical field of hydrogen storage materials and nanomaterials, and specifically discloses a nano-lithium borohydride, its in-situ preparation method and application. The preparation method is to mix butyl lithium and triethylamine borane in an organic solvent , heating and reacting under high-pressure hydrogen, and obtaining nano-lithium borohydride after post-treatment, and can also add carrier materials and transition metallocenes to obtain nano-lithium borohydride containing carriers and catalysts. Based on the solvothermal reaction, the present invention combines the hydrogen absorption reaction of butyllithium and the absorption of BH by lithium hydride 3 Reaction combined in one time, LiBH can be obtained through one-time hydrothermal synthesis 4 , can better control the particle size of the product, and the obtained nano-lithium borohydride hydrogen storage material has the advantages of high hydrogen storage capacity, low hydrogen absorption and desorption operating temperature, and fast hydrogen absorption and desorption rate.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage materials and nanomaterials, in particular to a nanometer lithium borohydride, its in-situ preparation method and application. Background technique [0002] Energy is the driving force for the development of human society and the basis for human survival. With the increasing depletion of traditional fossil fuels and the increasing environmental pollution caused by harmful gases such as greenhouse gases, nitrogen oxides, sulfides, and fluorides, the development of safe, efficient, clean, and cheap new renewable energy has become crucial. Hydrogen energy is a new type of energy with abundant reserves, high energy density, clean and pollution-free. Its large-scale development and utilization has been limited by efficient and safe storage and transportation. At present, solid-state hydrogen storage materials based on chemical hydrogen storage mechanism have attracted much attention because o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B6/21B82Y40/00C01B3/00
CPCC01B6/21B82Y40/00C01B3/001C01P2004/64C01P2004/03C01P2004/04C01P2002/82C01P2002/72C01P2002/85Y02E60/32
Inventor 刘永锋张欣潘洪革高明霞
Owner ZHEJIANG UNIV
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