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Electroreduction CO2 device and method

A CO2, membrane electrode technology, applied in the field of electrochemistry, can solve the problems of the difficulty of large-scale industrial application of the dual electrolyte solution feeding mode, the difficulty of liquid mass transfer inside the solubility electrode, and the high requirements for anti-corrosion of pipeline equipment, so as to broaden the practical application of the process. performance, good economic and social benefits, and low equipment requirements

Active Publication Date: 2019-10-18
BEIJING FUMEIJIA ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main drawback of this model is caused by the low CO in the liquid phase 2 Solubility and low CO selectivity problems caused by the difficulty of liquid mass transfer inside the electrode, electrolyte consumption caused by electrolyte mass transfer between the cathode and anode chambers and unstable electrolyte concentration in the cathode and anode chambers, as well as corrosion and erosion of the electrolyte solution Insufficient long-term stability of the electrode and high anti-corrosion requirements of pipeline equipment caused by the problem
The existence of these defects makes it difficult for the dual electrolyte solution feeding mode to enter large-scale industrial applications

Method used

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  • Electroreduction CO2 device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The diaphragm R103 of the membrane electrode in the device of this embodiment is an anion exchange membrane, and the two sides of the diaphragm are respectively spray-coated with a cathode catalyst composed of nano-silver powder and carbon powder and an Ir black anode catalyst. The effective active area of ​​the electrochemical reactor membrane electrode is 2500cm 2 .

[0062] Such as figure 1 As shown, electroreduction of CO 2 The device includes electrochemical reaction unit R1 (including R101 cathode chamber, anode chamber R102; diaphragm 103, cathode electrode R105, anode electrode R106), cathode humidification tank T1, cathode drying tank T2, synthesis gas separator T3, anode tank T4, gas Circulation pump C1, humidity control controller S1, humidity meter S2, heat exchanger E1, anode circulation pump P1, main intake pipeline 1, first CO 2 Intake line 2, second CO 2 Intake pipeline 3, cathode inlet pipeline 4, cathode gas outlet pipeline 5, product synthesis gas...

Embodiment 2

[0069] This example uses figure 1 In the shown device, the diaphragm R103 is a cation exchange membrane, and the two sides of the diaphragm are respectively sprayed with a cathode catalyst composed of nano-silver powder and carbon powder and an Ir black anode catalyst. The effective active area of ​​the electrochemical reactor membrane electrode is 2500cm 2 .

[0070] The process of preparing synthesis gas by device operation is as follows:

[0071] Use dry or wet CO 2 Gas A is used as the gas source, and the pre-treatment of A is the same as in Example 1, and the relative humidity of the feed gas is 60%. Also pass pure liquid water into the anode chamber R102 in the same manner as in Example 1. The electrochemical reactor R1 is energized by the DC power supply R104, and the pure water releases the anode product C(O 2 ). o 2 Return to the anode tank T4 through the first anode outlet line 9, and then be discharged through the second anode outlet line 10. CO 2 and H 2 ...

Embodiment 3

[0076] This example uses figure 1 The device shown, the diaphragm R103 is the same as that in Example 1. The two sides of the diaphragm are respectively sprayed with a cathode catalyst composed of nano-silver powder and carbon powder and an Ir black anode catalyst. The effective active area of ​​the electrochemical reactor membrane electrode is 2500cm 2 .

[0077] Use dry or wet CO 2 Gas A is used as the gas source, and the pretreatment of A is the same as that in Example 1.

[0078] A potassium bicarbonate solution with a molar concentration of 0.02 mol / L was added to the anode tank T4 instead of liquid water, and the other steps were the same as in Example 1. During the operation of the device, there is no need to supplement potassium bicarbonate solution to the anode tank T4, and an appropriate amount of pure water can be supplemented through the anode water replenishment pipeline 13 depending on the situation. The relative humidity of the intake air at the R101 feed i...

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Abstract

The invention provides an electroreduction CO2 device. The electroreduction CO2 device comprises an electrochemical reaction unit and a cathode feeding unit, wherein the electrochemical reaction unitcomprises a cathode chamber, an anode chamber and a membrane electrode, and a diaphragm of the membrane electrode is an anion-exchange membrane; and the cathode feeding unit is connected with a feeding opening of the cathode chamber, and the cathode feeding unit inputs humidified gas containing CO2 to the cathode chamber. The invention further provides an electroreduction CO2 method. The electroreduction CO2 device and method have the advantages of simple and convenient technology, green and environmental protection, low equipment requirement, low manufacturing cost and the like, are very suitable for industrial synthesis gas production, and good economic benefits and social benefits can be achieved.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to electroreduction of CO 2 Apparatus and methods. Background technique [0002] with CO and H 2 Syngas, which is mainly composed of synthetic gas, is the basic raw material for the production of high value-added fuels and chemicals by industrial Fischer-Tropsch synthesis process. Syngas is mainly produced through the coal gasification route, but a large amount of CO is produced as a by-product 2 , not only caused a considerable waste of carbon resources, but also caused considerable pressure on carbon emission reduction. CO can be converted electrochemically 2 Converting to CO is not only an environmentally friendly and clean way to reduce carbon emissions, but also a way to increase the production capacity of syngas 2 It is a way of resource reuse, and it is also an energy storage method to support renewable energy power generation. But as an attractive new technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25B1/10C25B9/10C25B9/23
CPCC25B1/00C25B1/04C25B9/73C25B9/23Y02E60/36
Inventor 汪秀萍陶耀光张红飞康鹏
Owner BEIJING FUMEIJIA ENERGY TECH CO LTD
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