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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AI-Extracted 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 ...

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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.

Application Domain

Water contaminantsCatalyst activation/preparation +1

Technology Topic

Strong acidsMetallurgy +7

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Examples

Experimental program(3)
Comparison scheme(2)

Example Embodiment

[0028] Example 1:

[0029] 291mg Co (NO 3 ) 2.6h 2 O and 168.0 mg of diaminobiconitrile, which were dissolved in 40 ml of anhydrous ethanol, and the ultrasonic was allowed to dissolve, and then the diaminum male nitrile solution was poured into the cobalt solution of hexahydrate, mixed, and then The mixed solution was hot for 12 h at 135 ° C, cooled to room temperature and dried, and the dried solid was polished into a powder. The above powder was placed in a tube furnace under an AR atmosphere, heated at 2 ° C / min to 550 ° C, and held for 2 h. The resulting solid is dispersed in 2M h after nature cooling to room temperature. 2 SO 4In the medium, heated to 80 ° C for 2 h, filtered through heat, washed 3 times with deionized water, the filter cake was dried at 60 ° C for 12 h, and the resulting solid was Concon 4 / C catalyst.

[0030] CON 4 / C metal catalyst application:

[0031] Take 10g hydrogen peroxide reaction liquid (1M H 2 SO 4 About 10% wt is h 2 SO 4 And 1% WT h 2 O 2 The rest are water and trace impurities. In order to reduce H in this product 2 O 2 Content, 40mg con 4 The / C metal catalyst is added thereto, and the reaction is mixed at 60 ° C for 1 h, and the sample is measured after the reaction is completed. 2 O 2 All partial solution, conversion rate is 100%. The catalyst was recovered, re-responded at the same conditions, repeated six times, the catalyst decomposed hydrogen peroxide can still reach 100% conversion rate.

[0032] Figure 4 For (a) CO-N-C (CON before pickling 4 / C material) and con 4 / C sample XRD map; (b) con 4 / C calcined XRD map at different temperatures; it can be seen that the CO element is not shown in the 450 ° C sample, mainly due to the crystal of the CO element and the CO-N bond; 550 ° C. Crystal. The CO element formed by (100), (002), (101) and 650 ° C is another crystal form, and the crystal plane is (111) and (200), which can know that the temperature is too high is another CO. The CO catalytic performance of this crystal form is relatively poor. Water heat temperatures affect the polymerization of metals and diaminononitriles, low temperature or higher can cause incomplete metal and ligand polymerization, and the hydrothermal conditions also affect the crystallization rate, and the crystallization rate will cause the subsequent material preparation process. A larger cluster is formed in a large group of guscases cannot be wrapped in graphene.

Example Embodiment

[0033] Example 2:

[0034] According to the catalyst preparation conditions in Example 1, 10 g of the hydrogen peroxide reaction liquid (1 m h) was taken. 2 SO 4 About 10% wt is h 2 SO 4 And 1% WT h 2 O 2 The rest are water and trace impurities. In order to reduce H in this product 2 O 2 Content, 40mg con 4 / C metal catalyst was added thereto, and the reaction was stirred at room temperature for 2 h, and the sample was measured after the reaction was completed. 2 O 2 All partial solution, conversion rate is 100%.

Example Embodiment

[0035] Example 3:

[0036] According to the catalyst preparation conditions in Example 1, 10 g of different acid concentrations (2 to 7 m h) were taken. 2 SO 4 The hydrogen peroxide reaction liquid, that is, therein, about 20% wt ~ 70% wt is h 2 SO 4 And 1% WT h 2 O 2 The rest are water and trace impurities. In order to reduce H in this product 2 O 2 Content, 40mg con 4 / C metal catalyst is added thereto, and the reaction is stirred at 60 ° C for 1 h, and each sample is measured after the reaction is completed. 2 O 2 All partial solution, conversion rate is 100%. It is shown that the catalyst prepared by the present invention can be efficiently decomposed in a strong acid environment. 2 O 2.

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Classification and recommendation of technical efficacy words

Avoid dissolution
Stable structure and performance

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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