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Hollow polymeric carbon nitride catalyst and application thereof in synthesis of acetaldehyde by photocatalytic reduction of CO2

A polymerized, carbon nitride technology, applied in the field of photocatalysis, can solve the problems of mercury pollution, equipment corrosion, and large consumption of raw materials in the ethanol oxidation method, and achieve the effects of stable catalytic activity and high selectivity to acetaldehyde.

Pending Publication Date: 2021-07-09
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The acetylene direct hydration method uses mercury salt as a catalyst, which has the problem of mercury pollution. The raw material consumption of the ethanol oxidation method is large, and the raw material consumption of the ethylene direct oxidation method is small, and the synthesis process route is simple. It is the main method for the industrial production of acetaldehyde today. The hydrochloric acid solution of palladium chloride and copper chloride is mainly used as the catalyst, which seriously corrodes the equipment and requires the use of special materials such as precious metal titanium

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  • Hollow polymeric carbon nitride catalyst and application thereof in synthesis of acetaldehyde by photocatalytic reduction of CO2
  • Hollow polymeric carbon nitride catalyst and application thereof in synthesis of acetaldehyde by photocatalytic reduction of CO2
  • Hollow polymeric carbon nitride catalyst and application thereof in synthesis of acetaldehyde by photocatalytic reduction of CO2

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preparation example Construction

[0024] A method for preparing a hollow polymeric carbon nitride catalyst, comprising the following steps: adding a certain amount of dicyandiamide and N,N-diethylacetamide into water, mixing, heating and stirring to obtain dicyandiamide and N,N- Diethylacetamide mixed aqueous solution, transfer the mixed aqueous solution of dicyandiamide and N,N-diethylacetamide to a hydrothermal reaction container, place it in an oven for hydrothermal reaction, and after cooling to room temperature naturally, the obtained The product was washed three times with ethanol and distilled water, and then dried in an oven to obtain a supramolecular intermediate, which was transferred to a porcelain crucible and calcined at a high temperature in a muffle furnace to obtain a hollow polymeric carbon nitride catalyst .

[0025] In the present invention, N,N-diethylacetamide is a reducing agent modified dicyandiamide. In the present invention, there is no special limitation on the sources of N,N-diethyl...

Embodiment 1

[0030] A preparation method of a hollow polymerization type carbon nitride catalyst, comprising the steps of:

[0031] Add dicyandiamide and N,N-diethylacetamide into water to form a mixed aqueous solution, the mass concentration of dicyandiamide in the mixed aqueous solution is 1g / L, and the volume fraction of N,N-diethylacetamide is 0.05%. After heating and stirring for 0.1h, transfer it to a hydrothermal reaction kettle, place it in an oven and heat it to 100°C, and react for 5h. Self-assembly formation mechanism, after naturally cooling to room temperature, the resulting product was washed three times with ethanol and distilled water, placed in an oven, and dried at a temperature of 50°C for 6 hours to obtain a supramolecular intermediate, the supramolecular intermediate Transfer to a porcelain crucible and place in a muffle furnace at 400°C for high temperature calcination for 2 hours to obtain a polymeric carbon nitride catalyst PCN-N 1 .

[0032] figure 1 It is the t...

Embodiment 2

[0034] Referring to Example 1, the difference is that the volume fraction of N,N-diethylacetamide in the mixed aqueous solution is 0.1%, placed in an oven and heated to 180°C, reacted for 10h, and transferred the supramolecular intermediate to a porcelain crucible Calcined at a high temperature in a muffle furnace at 550°C to obtain a polymeric carbon nitride catalyst PCN-N 2 .

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Abstract

The invention discloses a hollow polymeric carbon nitride catalyst and application thereof in synthesis of acetaldehyde by photocatalytic reduction of CO2. A preparation method of a hollow polymeric carbon nitride catalyst comprises the following steps: adding dicyandiamide and N,N-diethyl acetamide into water, mixing, heating and uniformly stirring to obtain a mixed aqueous solution of the dicyandiamide and the N,N-diethyl acetamide; transferring the mixed aqueous solution into a hydrothermal reaction container for hydrothermal reaction, naturally cooling to room temperature after the reaction is completed, washing and drying the obtained product to obtain a supramolecular intermediate, and calcining the supramolecular intermediate at high temperature to obtain the hollow polymeric carbon nitride catalyst. According to the preparation method, the N,N-diethyl acetamide is adopted as a reducing agent to modify the dicyandiamide, and N,N-diethyl acetamide is utilized to regulate and control a self-assembly forming mechanism of the dicyandiamide, so that the polymeric carbon nitride catalyst which is in a hollow bubble shape and has a high crystallinity / amorphous binary structure is obtained.

Description

Technical field: [0001] The invention relates to the technical field of photocatalysis, in particular to a hollow polymeric carbon nitride catalyst and its use in photocatalytic reduction of CO 2 Application of synthetic acetaldehyde. Background technique: [0002] Acetaldehyde is an important chemical raw material, which can be used in the manufacture of acetic acid, acetic anhydride, synthetic resin, rubber, plastic, spices, leather, pharmaceuticals, paper, medicine, as a preservative, antivirus, imaging Agents, solvents, reducing agents, etc. [0003] The main synthesis methods of acetaldehyde include direct oxidation of ethylene, oxidation of ethanol, direct hydration of acetylene, and deoxygenation of ethanol. The acetylene direct hydration method uses mercury salt as a catalyst, which has the problem of mercury pollution. The raw material consumption of the ethanol oxidation method is large, and the raw material consumption of the ethylene direct oxidation method is ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C07C45/44C07C47/06
CPCB01J27/24C07C45/44B01J35/39C07C47/06Y02E60/36
Inventor 汪福宪刘琼成晖卫莉玲
Owner INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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