Preparation method of gas diffusion electrode for electrochemical treatment of SO2

A gas diffusion electrode, SO2 technology, applied in chemical instruments and methods, gas treatment, separation methods, etc., can solve the problem of inability to meet the requirements of low-concentration sulfur-containing flue gas treatment, restricting the development of electrochemical treatment and industrial applications, mass transfer rate High energy consumption and other issues

Inactive Publication Date: 2016-07-13
NANKAI UNIV
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Problems solved by technology

In principle, this is a gas-liquid two-phase interface reaction, and the limited mass transfer rate and high energy consumption severely inhibit the efficiency of electrochemical oxidation; 2 The concentration of sulfur also has certain requirements, which cannot meet the processing requirements of low-concentration sulfur-containing flue gas with complex and diverse components in industry, which limits the electrochemical treatment of SO 2 Further development and industrial application of

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  • Preparation method of gas diffusion electrode for electrochemical treatment of SO2
  • Preparation method of gas diffusion electrode for electrochemical treatment of SO2
  • Preparation method of gas diffusion electrode for electrochemical treatment of SO2

Examples

Experimental program
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Embodiment 1

[0021] An electrochemical treatment of SO 2 The preparation method of the gas diffusion electrode, the steps are as follows:

[0022] 1) Add 2.0g of powdery conductive carbon black to 60mL of absolute ethanol until it is fully submerged and dispersed evenly. After ultrasonic stirring at room temperature for 20min, 5g of polytetrafluoroethylene emulsion with a mass fraction of 60% (density of about 1.45g / mL), continue to ultrasonically stir for 20 minutes, put the obtained mixed solution in an 80°C water bath and stir until it forms a lump, then roll it into a film to obtain a diffusion layer film;

[0023] 2) Cover the diffusion layer film obtained in step 1) on the 60-mesh stainless steel mesh collector fluid, cut it into a circle with a diameter of 6 cm after roll forming, put it into a muffle furnace for calcination at 340°C for 20 minutes, and take it out for use.

[0024] 3) Add 1.9g of powdered carbon black and 0.1g of multi-walled carbon nanotubes to 60mL of absolute ...

Embodiment 2

[0028] An electrochemical treatment of SO 2 The preparation method of the gas diffusion electrode, the steps are as follows:

[0029] 1) Add 2.0g of powdery conductive carbon black to 60mL of absolute ethanol until it is fully submerged and dispersed evenly. After ultrasonic stirring at room temperature for 20min, 5g of polytetrafluoroethylene emulsion with a mass fraction of 60% (density of about 1.45g / mL), continue to ultrasonically stir for 20 minutes, put the obtained mixed solution in an 80°C water bath and stir until it forms a lump, then roll it into a film to obtain a diffusion layer film;

[0030] 2) Cover the diffusion layer film obtained in step 1) on the 60-mesh stainless steel mesh collector fluid, cut it into a circle with a diameter of 6 cm after roll forming, put it into a muffle furnace for calcination at 340°C for 20 minutes, and take it out for use.

[0031] 3) Add 1.9g of powdered carbon black and 0.1g of multi-walled carbon nanotubes to 60mL of absolute ...

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Abstract

A preparation method of a gas diffusion electrode for electrochemical treatment of SO2 comprises steps as follows: 1) powdery conductive carbon black is added to absolute ethyl alcohol until the carbon black is completely immersed, a polytetrafluoroethylene emulsion is added, the mixture is subjected to water bath treatment and stirred until clustered substances are formed, the clustered substances are rolled to form a film, and a diffusion layer film is obtained; 2) a stainless steel net current collector is covered with the diffusion layer film, rolling forming is performed, and the film is taken out for standby use after being calcined in a muffle furnace; 3) the powdery carbon black and a little quantity of carbon nanotubes are rolled to form a film with a method in the step 1), and a catalyst layer film is obtained; 4) the other side of the stainless steel net current collector is covered with the catalyst layer film, rolling forming is performed, and a target object is prepared. The preparation method has the advantages as follows: SO2 diffusion mass transfer is reinforced by increasing gas transferring pore channels of the electrode; a process is simple, the cost of raw materials is low, the mechanical strength of the prepared gas diffusion electrode is high, the reusability is good, the SO2 conversion efficiency is high, and the gas diffusion electrode is suitable for engineering application of electrochemical treatment of SO2.

Description

technical field [0001] The invention relates to the technical field of applied chemistry-energy saving and emission reduction, in particular to an electrochemical treatment of SO 2 The preparation method of the gas diffusion electrode. technical background [0002] In recent years, quite a few cities in my country have frequent smog weather in spring and winter, SO 2 It is one of the main substances that form smog. my country on SO 2 The index control of emissions is becoming more and more stringent, and the flue gas desulfurization process (such as wet method, dry method / semi-dry method, etc.) used in industry has application to small-scale thermal power plants and chemical plants, etc. High cost, unstable operation and other problems. Electrochemical methods for the control of gaseous pollutants have attracted attention in recent years due to their multifaceted good performance, among which electrochemical methods for the treatment of SO 2 Use electrons as a clean tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/74B01D53/50
CPCB01D53/50B01D53/74B01D53/78B01D2259/12
Inventor 于宏兵陈赜董恒于晗
Owner NANKAI UNIV
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