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Method for efficiently decomposing hydrogen peroxide by using graphene-coated cobalt catalyst under acidic condition

A technology of graphene coating and cobalt catalyst, which is applied in the field of materials chemistry, can solve the problems of increasing the difficulty of dissolution, separation and purification, recycling costs, oxidative damage of surface active groups, collapse of pore structure, etc., and achieves low raw material cost and good catalysis Performance, effect of preventing dissolution

Pending Publication Date: 2021-11-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another commonly used method in the industry is to directly add metal ions for decomposition without adjusting acidic conditions, but this is easy to introduce new impurity ions, which increases the difficulty of dissolution, separation, purification and recovery costs
In addition, activated carbon is also used to adsorb and decompose hydrogen peroxide, but under strong acid conditions, the large pore structure of activated carbon will collapse and the surface active groups will be oxidized and destroyed, resulting in a decrease in the decomposition effect and cannot be reused.

Method used

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  • Method for efficiently decomposing hydrogen peroxide by using graphene-coated cobalt catalyst under acidic condition
  • Method for efficiently decomposing hydrogen peroxide by using graphene-coated cobalt catalyst under acidic condition
  • Method for efficiently decomposing hydrogen peroxide by using graphene-coated cobalt catalyst under acidic condition

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Experimental program
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Effect test

Embodiment 1

[0029] Weigh 291mg Co(NO 3 ) 2 .6H 2 The diaminomaleonitrile of 0 and 168.0mg is dissolved in 40mL dehydrated alcohol respectively, ultrasonic 30min makes it fully dissolve, then diaminomaleonitrile solution is poured in the hexahydrate cobalt nitrate solution, mixes and leaves standstill, after The mixed solution was heated at 135°C for 12 hours, cooled to room temperature, washed and dried, and the dried solid was ground into powder. The above powder was placed in a tube furnace under an Ar atmosphere, heated to 550 °C at a heating rate of 2 °C / min, and kept for 2 h. After being naturally cooled to room temperature, the resulting solid was dispersed in 2M H 2 SO 4, heated to 80°C and stirred for 2h, filtered while hot and washed 3 times with deionized water, dried the filter cake at 60°C for 12h, and the obtained solid was CoN 4 / C Catalyst.

[0030] CoN 4 Application of / C metal catalyst:

[0031] Get 10g hydrogen peroxide reaction solution (1M H 2 SO 4 ), of whic...

Embodiment 2

[0034] According to the catalyst preparation condition in embodiment 1, get the hydrogen peroxide reaction liquid (1M H 2 SO 4 ), of which about 10% wt is H 2 SO 4 and 1%wt H 2 o 2 , and the rest are water and trace impurities. In order to reduce the H in this product 2 o 2 content, the 40mg CoN 4 / C metal catalyst was added therein, stirred and reacted at room temperature for 2h, and the H in the sample was measured after the reaction was completed. 2 o 2 All decomposition, conversion rate 100%.

Embodiment 3

[0036] According to the catalyst preparation conditions in Example 1, get 10g of different acid concentrations (2~7M H 2 SO 4 ) hydrogen peroxide reaction solution, that is, about 20% wt to 70% wt is H 2 SO 4 and 1%wt H 2 o 2 , and the rest are water and trace impurities. In order to reduce the H in this product 2 o 2 content, the 40mg CoN 4 / C metal catalyst was added to it, stirred and reacted at 60°C for 1h, and the H in each sample was measured after the reaction 2 o 2 All decomposition, conversion rate 100%. It shows that the catalyst prepared by the present invention can efficiently decompose H under the environment of strong acid 2 o 2 .

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Abstract

The invention discloses a method for efficiently decomposing hydrogen peroxide by using a graphene-coated cobalt catalyst under an acidic condition, which comprises the following steps: mixing diaminomaleonitrile and cobalt salt, carrying out hydrothermal treatment at 135 DEG C for 12 hours, washing and drying the generated precipitate, heating to 450-650 DEG C in an inert atmosphere, keeping for 2-4 hours, and carrying out acid pickling and drying to obtain the catalyst. The graphene-coated cobalt catalyst prepared by the invention can efficiently decompose H2O2 into O2 and H2O so as to eliminate potential safety hazards caused by excess H2O2 in industrial production. The catalyst is stable in structure and performance, shows good catalytic performance in a strong acid environment, and can be reused. The catalyst is suitable for reducing the concentration of H2O2 to a safe level in various liquid phase systems, and due to the advantages, the catalyst is expected to be produced on a large scale and applied to industrial production.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a method for efficiently decomposing hydrogen peroxide by a graphene-coated cobalt catalyst under acidic conditions. Background technique [0002] Hydrogen peroxide (H 2 o 2 ) is one of the 100 most important chemicals in the world and is widely used in industries such as chemical industry, electronics, food and medicine. The Gibbs energy of the decomposition reaction of hydrogen peroxide becomes negative, indicating that it can undergo self-decomposition reaction in thermodynamics, but the reaction is very slow at normal temperature and pressure. At room temperature, pure 90% H without stabilizer 2 o 2 The decomposition rate is not higher than 1%; at 100°C, the decomposition rate is 2% in one day. Especially under acidic conditions, such as a sulfuric acid system with a pH value of 4.0, H 2 o 2 The decomposition rate is only 0.0004%. In view of the...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/10C02F1/00C02F101/10
CPCB01J27/24B01J37/10C02F1/00C02F2101/10
Inventor 吴文婷杨柳张庭威于晨吕慧栋吴明铂李忠涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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