CN110862066A - Potassium borohydride hydrolysis process - Google Patents

Abstract

The invention discloses a potassium borohydride hydrolysis process, which comprises the following steps: s1, uniformly stirring the self-made catalyst and the rare earth oxide in a mortar by using a glass rod to obtain a mixture, wherein the mass fraction of the rare earth oxide in the mixture is 80-90%; s2, adding the mixture into an alkaline aqueous solution of potassium borohydride, and performing hydrolysis and hydrogen desorption reaction on the potassium borohydride by using a self-made catalyst doped with rare earth oxide; the self-made catalyst is an M3O4-GO composite material, a MOx-PG composite material, PG, an M3O4-rGO composite material, a MOx-GCNFs composite material or GCNFs; wherein M is Co or Mn; the rare earth oxide is CeO2, Y2O3, Nd2O3, Gd2O3 or La2O 3. The method utilizes the mixture of the self-made catalyst and the rare earth oxide to carry out the hydrolysis and hydrogen release reaction of the potassium borohydride, has simple method and obviously improves the hydrogen release amount.

Description

Potassium borohydride hydrolysis process

Technical Field

The invention relates to the technical field of chemical synthesis, in particular to a potassium borohydride hydrolysis process.

Background

Potassium borohydride is an excellent reducing agent for the reduction of organic selective groups, reducing the organic functional groups RCHO, RCOR, RCOCl to RCH2, CHR2, HOHR, RCH2OH, etc.; it can also be used for hydrogen production and other hydroboron, and for analytical chemistry, paper industry, treatment of mercury-containing waste water and synthesis of cellulose potassium, etc., and has wide application.

At present, potassium borohydride hydrolysis hydrogen production technology generally dissolves potassium borohydride in high-concentration alkaline solution, and when hydrogen needs to be produced, a catalyst (generally a metal catalyst) is used to contact the solution, so that hydrogen is released. The system has more safety problems due to the alkaline concentration, simultaneously, the hydrogen content of the actual reactant system is not large due to the limit of the saturated solubility of the borohydride in water, and the structure is very complicated due to the need of a mechanical mechanism to put in and recycle the catalyst. Secondly, when the catalyst is used for producing hydrogen, a borohydride hydrolysate KBO2 may be attached to the surface of the catalyst, so that the surface of the catalyst is oxidized to deactivate the catalyst, the specific surface area of the catalyst is reduced, and the reaction rate is slowed down. And the noble metal catalyst is expensive, so the wood formation of hydrogen production is improved, and the industrial application of hydrogen production by hydrolysis of potassium borohydride is limited.

Disclosure of Invention

The invention aims to solve the technical problem of potassium borohydride hydrolysis process, but the method has the defect of low yield, and provides the potassium borohydride hydrolysis process.

In order to solve the technical problems, the invention provides the following technical scheme:

a potassium borohydride hydrolysis process comprises the following steps:

s1, uniformly stirring the self-made catalyst and the rare earth oxide in a mortar by using a glass rod to obtain a mixture, wherein the mass fraction of the rare earth oxide in the mixture is 80-90%;

s2, adding the mixture into an alkaline aqueous solution of potassium borohydride, and performing hydrolysis and hydrogen desorption reaction on the potassium borohydride by using a self-made catalyst doped with rare earth oxide;

the self-made catalyst is an M3O4-GO composite material, a MOx-PG composite material, PG, an M3O4-rGO composite material, a MOx-GCNFs composite material or GCNFs; wherein M is Co or Mn;

the rare earth oxide is CeO2, Y2O3, Nd2O3, Gd2O3 or La2O 3.

Further, the preparation method of the self-made catalyst comprises the following steps:

(1) respectively dispersing GO and M3O4 nanocrystals into absolute ethyl alcohol;

(2) adding the ethanol dispersion liquid of M3O4 nanocrystalline into the ethanol dispersion liquid of GO under stirring, continuing stirring for 12-16h after the addition is finished, standing, pouring out the supernatant, and drying at 50-80 ℃ to obtain the catalyst M3O4-GO composite material.

Further, the content of potassium borohydride in the potassium borohydride alkaline aqueous solution is 70-80% of the total mass of potassium borohydride and the mixture.

The invention has the following beneficial effects: the method utilizes the mixture of the self-made catalyst and the rare earth oxide to carry out the hydrolysis and hydrogen release reaction of the potassium borohydride, has simple method and obviously improves the hydrogen release amount.

Detailed Description

The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.

Example 1

A potassium borohydride hydrolysis process comprises the following steps:

s1, uniformly stirring the self-made catalyst and the rare earth oxide in a mortar by using a glass rod to obtain a mixture, wherein the mass fraction of the rare earth oxide in the mixture is 80-90%;

s2, adding the mixture into an alkaline aqueous solution of potassium borohydride, and performing hydrolysis and hydrogen desorption reaction on the potassium borohydride by using a self-made catalyst doped with rare earth oxide;

the self-made catalyst is an M3O4-GO composite material, a MOx-PG composite material, PG, an M3O4-rGO composite material, a MOx-GCNFs composite material or GCNFs; wherein M is Co or Mn;

the rare earth oxide is CeO2, Y2O3, Nd2O3, Gd2O3 or La2O 3.

The preparation method of the self-made catalyst comprises the following steps:

(1) respectively dispersing GO and M3O4 nanocrystals into absolute ethyl alcohol;

(2) adding the ethanol dispersion liquid of M3O4 nanocrystalline into the ethanol dispersion liquid of GO under stirring, continuing stirring for 12-16h after the addition is finished, standing, pouring out the supernatant, and drying at 50-80 ℃ to obtain the catalyst M3O4-GO composite material.

The content of potassium borohydride in the potassium borohydride alkaline aqueous solution is 70-80% of the total mass of potassium borohydride and the mixture.

The method utilizes the mixture of the self-made catalyst and the rare earth oxide to carry out the hydrolysis and hydrogen release reaction of the potassium borohydride, has simple method and obviously improves the hydrogen release amount.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. A potassium borohydride hydrolysis process is characterized by comprising the following steps:

s1, uniformly stirring the self-made catalyst and the rare earth oxide in a mortar by using a glass rod to obtain a mixture, wherein the mass fraction of the rare earth oxide in the mixture is 80-90%;

s2, adding the mixture into an alkaline aqueous solution of potassium borohydride, and performing hydrolysis and hydrogen desorption reaction on the potassium borohydride by using a self-made catalyst doped with rare earth oxide;

the self-made catalyst is an M3O4-GO composite material, a MOx-PG composite material, PG, an M3O4-rGO composite material, a MOx-GCNFs composite material or GCNFs; wherein M is Co or Mn;

the rare earth oxide is CeO2, Y2O3, Nd2O3, Gd2O3 or La2O 3.

2. The potassium borohydride hydrolysis process according to claim 1, wherein the self-made catalyst is prepared by the following steps:

(1) respectively dispersing GO and M3O4 nanocrystals into absolute ethyl alcohol;

(2) adding the ethanol dispersion liquid of M3O4 nanocrystalline into the ethanol dispersion liquid of GO under stirring, continuing stirring for 12-16h after the addition is finished, standing, pouring out the supernatant, and drying at 50-80 ℃ to obtain the catalyst M3O4-GO composite material.

3. The potassium borohydride hydrolysis process according to claim 1, wherein the content of potassium borohydride in the potassium borohydride alkaline aqueous solution is 70-80% of the total mass of potassium borohydride and the mixture.