NaBH4 sponge and preparation method thereof

A sponge and catalyst technology, which is applied in the field of NaBH4 sponge and its preparation, can solve the problems of insufficient reaction, uneven mixing of solid-phase hydrolysis materials, low tap density of sponge single-loaded catalyst, etc., to achieve the best reaction performance and improve conversion rate Effect

Active Publication Date: 2021-04-02
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the invention is to provide a kind of NaBH 4 The sponge and its preparation method solve the problems of uneve

Method used

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  • NaBH4 sponge and preparation method thereof
  • NaBH4 sponge and preparation method thereof
  • NaBH4 sponge and preparation method thereof

Examples

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preparation example Construction

[0039] a NaBH 4 The preparation method of sponge, comprises the following steps:

[0040] 1. Select the catalyst, use anhydrous or transition metal salt or complex containing a small amount of crystal water as the catalyst precursor, and the transition metal salt can be any one or a mixture of two or more of the following:

[0041] Chloride, sulfate, nitrate, acetate of Fe;

[0042] Chloride, sulfate, nitrate, acetate of Co;

[0043] Ni chloride, sulfate, nitrate, acetate.

[0044] 2. Prepare the precursor solution, mix the catalyst precursor with NaBH 4 Mix at a mass ratio of 0.01 to 0.2:1 and dissolve in an organic solvent at the same time. The organic solvent includes but is not limited to: methylamine, ethylamine, ethylenediamine, triethylamine, dimethylformamide and other amine organic solvents. Organic solvents and NaBH 4 The mass ratio of the catalyst precursor is 1:0.01~0.3, and the dissolution can be carried out at room temperature, or it can be heated and stirre...

Embodiment 1

[0049] CoCl 2 ·6H 2 O was dehydrated at 230 °C for 12 h to obtain anhydrous CoCl 2 . Take 0.25g or 0.5g or 1g of anhydrous CoCl 2 Dissolve in 40mL ethylenediamine, stir for 10min, then add 10g NaBH 4 , and continue to stir for 5 minutes until all solids are completely dissolved to obtain a precursor solution. Take the apparent density as 8mg·cm -3 A melamine resin (MF) sponge is used as a carrier, which is cut into a volume of 0.125cm -3 Take 0.35g of the above cube to make it fully absorb the precursor solution.

[0050] Put the sponge particles absorbing the precursor solution into a branched-necked flask with a volume of more than 100mL, and perform a vacuum distillation operation. The reaction temperature is 120°C, and the vacuum degree is controlled to be 4 The sponges were stored in a vacuum desiccator or in an Ar-filled glove box until use. The ethylenediamine obtained by distillation can be recovered and reused.

[0051] Take the above NaBH 4 Sponge 5g, placed...

Embodiment 2

[0054] Take 0.25g CoCl 2 ·H 2 O with 5g NaBH 4 , was added into 20 mL of ethylenediamine, and stirred for 10 min until all solids were completely dissolved to obtain a precursor solution. Take the apparent density as 8mg·cm -3 A melamine resin (MF) sponge was used as a carrier, which was cut into a volume of 1cm -3 cube. Take more than 20 cubes above to make them fully absorb the precursor solution.

[0055] Put the sponge particles absorbing the precursor solution into a branched-necked flask with a volume of 100ml, and carry out the standard operation of vacuum distillation. The reaction temperature is 80°C, and the vacuum degree is 4 The sponges were stored in a vacuum desiccator or in an Ar-filled glove box until use. The ethylenediamine obtained by distillation can be recovered and reused.

[0056] Take 1 block of the above-mentioned NaBH with a total mass of about 0.3g 4 Sponge, placed in the reactor, the reactor has a water inlet and a gas outlet, and can open th...

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PUM

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Abstract

The invention discloses NaBH4 sponge and a preparation method thereof. The preparation method comprises steps that a transition metal salt catalyst and a NaBH4 material are mixed and dissolved in an amine organic solvent at the same time, the mixture is evenly mixed and filled in the sponge, and the NaBH4 sponge is obtained after the solvent in the sponge is completely removed; the NaBH4 materialand the transition metal salt catalyst are uniformly mixed in the NaBH4 sponge on a nanometer scale. When water is added to NaBH4 sponge, NaBH4 is subjected to a hydrolysis reaction rapidly under theaction of a catalyst, water can be conveyed rapidly and effectively through the water absorption effect of the sponge, all parts in the system make uniform contact with water, and the hydrogen generation rate is more stable.

Description

technical field [0001] The invention belongs to the field of hydrogen storage technology and the field of fuel cells, in particular to a NaBH filled with solid sodium borohydride and a metal catalyst uniformly inside at the same time 4 Sponge and method for its preparation. Background technique [0002] Hydrogen storage technology is one of the key technologies that determine the application prospects of hydrogen fuel cells. NaBH 4 It is a very potential hydrogen storage material for hydrogen production by hydrolysis. It has the advantages of high theoretical hydrogen storage density, mild hydrogen production conditions, and easy control of the reaction. It is very suitable for hydrogen supply of small and medium-sized fuel cells. [0003] NaBH 4 Dissolved in alkaline solution, it can be stored stably. Using transition metal catalysts such as Fe, Co, Ni, etc., can catalyze NaBH 4 hydrolysis. Therefore, NaBH is usually stored in the form of alkaline aqueous solution 4 ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/8803H01M4/885H01M4/9016H01M4/9075Y02E60/50
Inventor 邓霁峰库尔邦尼沙·卡德尔时雨吴勇谢镭郑捷李星国
Owner PEKING UNIV
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