Electrochemical reduction method and apparatus for carbonic anhydride in ionic liquid

A carbon dioxide and ionic liquid technology, applied in the field of electrochemical reduction, can solve the problems of low current efficiency, low solubility, toxic and side effects, etc., and achieve the effect of high conductivity, high ion mobility and low toxicity

Inactive Publication Date: 2008-08-27
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

In aqueous solution, the main problems encountered in the electroreduction reaction of carbon dioxide are: ① the current efficiency of the electroreduction reaction of carbon dioxide is low; ② the solubility of carbon dioxide in aqueous solution is too low
In non-aqueous solvents, the main problems encountered in the electrochemical reduction reaction of carbon dioxide: 1. three commonly...

Method used

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  • Electrochemical reduction method and apparatus for carbonic anhydride in ionic liquid
  • Electrochemical reduction method and apparatus for carbonic anhydride in ionic liquid
  • Electrochemical reduction method and apparatus for carbonic anhydride in ionic liquid

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Embodiment Construction

[0021] Such as figure 1 As shown, the cathode chamber and the anode chamber of the electrochemical reaction device are separated by a proton exchange membrane (perfluorosulfonic acid membrane Nafion), and the above-mentioned ionic liquid is injected into the cathode chamber, and its structural formula is:

[0022]

[0023] R 1 , R 2 : H, C 1 -C 5 Hydrocarbyl

[0024] Carbon dioxide is passed into the cathode chamber, and the metal mesh close to the proton exchange membrane is used as the cathode; there is a Pt / C catalyst on the anode, and the catalyst layer consists of a diffusion layer (carbon paper or carbon cloth) and a catalytic layer (Pt / C catalyst). The function of the diffusion layer is to support the catalytic layer and provide gas channels for the electrochemical reaction, and the anode bipolar plate (material is carbon, stainless steel or titanium) is distributed with fine grooves.

[0025] Hydrogen is introduced into the anode chamber of the electrochemical ...

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Abstract

The invention relates to an electrochemical reducing method of carbon dioxide in ionic liquid and an electrochemical reducing device. The method comprises following steps: injecting ionic liquid in a cathode chamber in the electrochemical reducing device, inputting the carbon dioxide, inputting hydrogen on the inner side of an anode bipolar plate, oxidizing the hydrogen on an anode, generating hydrogen ions, enabling H+ to traverse through proton exchange membrane to reach a cathode, transmitting electrons to the cathode through an external circuit, enabling the carbon dioxide and the H+ to generate electrochemical reduction reaction on the cathode, generating organic compound such as carbinol and the like, and obtaining the carbinol, water and other secondary reaction products through distilling the organic compound which is generated. The ionic liquid of the invention has very high electrical conductivity and ion mobility, the ionic liquid is suitable to be used as a media system of electrochemical reaction, simultaneously, the ionic liquid has the advantages of low volatility and small toxicity, competitive reaction of the H+ is inhibited, since the solubility of the carbon dioxide in the ionic liquid is very high, the efficiency of the electrochemical reduction reaction of the carbon dioxide is also comparatively high, and the electrochemical method of the invention utilizes CO2 to generate the organic compounds such as the carbinol and the like (by products are aminic acid, formaldehyde and the like), which realizes the resource utilization of the CO2.

Description

technical field [0001] The invention relates to an electrochemical reduction method and device for carbon dioxide in ionic liquid. Background technique [0002] The electrochemical conversion of carbon dioxide into organic compounds such as methanol is an important way to realize the resource utilization of carbon dioxide. The electrochemical reduction reaction of carbon dioxide can be carried out in aqueous solution or non-aqueous system[1]. In aqueous solution, the main problems encountered in the electroreduction reaction of carbon dioxide are: ① the current efficiency of electroreduction reaction of carbon dioxide is low; ② the solubility of carbon dioxide in aqueous solution is too low. In non-aqueous solvents, the main problems encountered in the electrochemical reduction reaction of carbon dioxide: 1. three commonly used organic solvents (acetonitrile, dimethylformamide and dimethyl sulfoxide) are volatile and have toxic side effects; The electrochemical properties o...

Claims

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Application Information

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IPC IPC(8): C25B3/04C25B3/25
Inventor 施锦胡玉琪华一新
Owner KUNMING UNIV OF SCI & TECH
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