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Method for preparing hydrocarbon through electrochemical reduction of carbon dioxide

A hydrocarbon and carbon dioxide technology, applied in the electrolysis process, electrolysis components, electrolysis organic production, etc., can solve the problems of expensive ionic liquids, difficult to apply in a large scale, performance degradation, etc., to reduce efficiency, improve Faradaic efficiency, reduce The effect of reactive overpotentials

Inactive Publication Date: 2016-03-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ionic liquids are expensive, and ionic liquids need to be in a completely non-aqueous environment to work well
If it is in the air, the ionic liquid is easy to absorb water, which greatly reduces its performance, and it is difficult to be widely used in the air environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] At room temperature, the catholyte solution 0.5MKHCO The mixed solution of 100ml of aqueous solution and 5ml methanol solution (injected in the cathode chamber, the electrolytic solution is passed into CO Gas, carbon dioxide is absorbed; Simultaneously, 0.1MH SO Aqueous solution is injected in the anode chamber, with As the electrolyte in the anode chamber; use Cu foil (thickness 0.01mm) as the cathode Cu electrode, and Pt sheet as the anode electrode; at room temperature, turn on the electrolysis power supply, and carry out electrolysis reaction at -2.0Vvs.SCE, and oxygen evolution occurs at the anode Reaction, the generated hydrogen protons reach the cathode through the conductive membrane, and undergo an electroreduction reaction with carbon dioxide on the cathode to generate hydrocarbon gas; the gas products are collected in the upper part of the cathode chamber to obtain a mixture of methane, ethylene and other products;

Embodiment 2

[0028] At room temperature, the catholyte solution 0.2NaKHCO3 aqueous solution 100ml and 5ml isopropanol solution mixed solution (inject in the cathode chamber, the electrolytic solution is passed into CO2 gas, carbon dioxide is absorbed; at the same time, 0.1MNaHCO3 aqueous solution is injected in the anode chamber , used as the electrolyte in the anode chamber; Cu foil (thickness 0.02mm) is used as the cathode Cu electrode, and the Pt sheet is used as the anode electrode; at room temperature, the electrolysis power is turned on, and the electrolysis reaction is carried out at -2.5Vvs.SCE, and the anode occurs Oxygen evolution reaction, the generated hydrogen proton reaches the cathode through the conductive membrane, and undergoes an electroreduction reaction with carbon dioxide on the cathode to generate hydrocarbon gas; the gas product is collected in the upper part of the cathode chamber to obtain a mixture of methane, ethane, ethylene and other products;

Embodiment 3

[0030] At room temperature, with catholyte solution 0.2Na SO The mixed solution of 50ml of aqueous solution and 5ml propylene glycol solution (injection in the cathodic chamber, electrolytic solution is passed into CO Gas, carbon dioxide is absorbed; Simultaneously, 0.1MNaHCO Aqueous solution is injected in the anode chamber, with As the electrolyte in the anode chamber; use Cu mesh (thickness 0.125mm) as the cathode Cu electrode, and Pt wire as the anode electrode; at room temperature, turn on the electrolysis power supply, and perform electrolysis reaction at -2.5Vvs.SCE, and oxygen evolution occurs at the anode Reaction, the generated hydrogen protons reach the cathode through the conductive membrane, and undergo an electroreduction reaction with carbon dioxide on the cathode to generate hydrocarbon gas; the gas products are collected in the upper part of the cathode chamber to obtain a mixture of methane, ethane, ethylene and other products;

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PUM

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Abstract

The invention relates to a method for preparing hydrocarbon through electrochemical reduction of carbon dioxide. An electrolytic tank is divided into a left cavity and a right cavity through a proton exchange membrane, the left cavity and the right cavity are not communicated with each other, and the two cavities serve as a cathode chamber and an anode chamber respectively; and the cathode chamber is filled with an electrolyte solution, the electrolyte solution is an inorganic electrolyte aqueous solution where the carbon dioxide is dissolved, and an organic solvent is further added into the electrolyte solution. The method of combining inorganic salts and the organic solvent is adopted, and metal Cu electrodes in different shapes and forms serve as cathodes, anodes are formed by Pt pieces or Pt wire electrodes and the like, and therefore the conversion rate of the carbon dioxide and the energy cycle utilization rate are greatly increased.

Description

technical field [0001] The invention relates to the technology of electrochemically reducing carbon dioxide and belongs to the field of resource utilization of carbon dioxide. Background technique [0002] The fixation and conversion of CO2 is one of the effective measures to reduce CO2 emissions. It mainly includes storage fixation, catalytic hydrogenation, catalytic reforming and electrochemical conversion methods. Traditional catalytic hydrogenation and catalytic reforming methods must be carried out under high temperature, high pressure or catalyst conditions, and low conversion and efficiency limit their large-scale application. The advantage of the electrochemical reduction method is that it can effectively overcome the high oxidation-reduction potential of CO2 / CO2- (-1.9Vvs.SHE), the reaction can be realized under normal temperature and pressure, the reaction conditions are mild, and the operation is simple; The selective synthesis of products is achieved by control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/04C25B3/25
Inventor 钟和香张华民邱艳玲毛景霞
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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