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A h-type fixed bed carbon dioxide reduction electrolytic cell and its application

A carbon dioxide and fixed bed technology, applied in the direction of electrolysis components, electrolysis process, electrolysis organic production, etc., to achieve the effect of reducing diffusion, timely supply and stability

Active Publication Date: 2022-03-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CO 2 There is a big difference in the electrode process of RR and fuel cell, and it is oriented to the application of CO 2 RR should have a reactor design that matches its reaction environment

Method used

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  • A h-type fixed bed carbon dioxide reduction electrolytic cell and its application
  • A h-type fixed bed carbon dioxide reduction electrolytic cell and its application
  • A h-type fixed bed carbon dioxide reduction electrolytic cell and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: H-type fixed bed CO 2 Structure and material selection of RR electrolytic cell

[0044] H type fixed bed CO 2 The structural design of the RR electrolytic cell, its structure is as follows figure 1 shown. An electrolytic cell consists of a cathode assembly, an anode assembly, and a 115 film 10 constitute.

[0045] The anode assembly consists of an anode chamber 9, 1cm with a volume of 100mL 2 The Pt sheet oxygen anode 19 and the connectors (including 6, 7, 9, 15, 16 and 20) used for anode fixing and sealing of the anode chamber are composed; the cathode assembly is composed of a volume of 100mL cathode chamber 8, saturated calomel Electrode 13, fixed bed cathode main unit (1, 2, 3 and 4), 6mm diameter carbon rod current collector 18, and connectors (including 5, 11, 12, 14 and 17) for sealing the cathode chamber and fixing the electrodes.

[0046] The fixed bed cathode main unit is composed of a fixed bed cover 1, a fluid distributor 2, a cathode gran...

Embodiment 2

[0053] Example 2: H-type fixed bed CO 2 System integration of RR electrolytic cell

[0054] H type fixed bed CO 2 The system integration of RR electrolytic cell is divided into anode component assembly, cathode component assembly and CO 2 The assembly of the RR reaction system is carried out in three steps.

[0055] (1) Assembly of anode components

[0056]The central threaded hole C2-3 (G1 / 8" internal thread) of the fixed bed cover 1 is threadedly connected with the PTFE tube-sheet joint, and the two are sealed by an O-ring, and the cathode carbon rod collecting rod (6mm in diameter )18 is inserted into the tube-sheet joint and sealed by a 6mm ferrule; the remaining three threaded holes (1 / 4-28UNF internal thread) of the fixed bed cover 1 are connected to the tube-sheet joint, and a 3mm-diameter hose is connected externally to realize the gas and liquid in the reactor flow path.

[0057] The cylindrical fixed bed cavity 3 (50 mm in diameter) is threadedly connected with ...

Embodiment 3

[0067] Example 3: H-type fixed bed CO 2 Application of RR electrolytic cell

[0068] Spherical metal Sn particles with a diameter of 2mm are used as catalysts, filled into H-type fixed bed CO 2 The cylindrical fixed bed cavity 3 of the cathode of the RR electrolytic cell forms a three-dimensional cathode network. Wherein, the cylindrical fixed bed cavity 3 is made of methyl methacrylate, and the cathode and anode pass through the cation exchange membrane ( 115 film) separated. It forms a three-electrode system with a saturated calomel electrode (SCE) and a Pt sheet anode. Fill the cathode and anode chambers with 0.5mol·L electrolyte respectively -1 KHCO 3 aqueous solution. The electrolyte on the cathode side flows out from the threaded hole B6-2 of the reference electrode fixing part 11, is driven by a peristaltic pump, and returns to the cathode chamber through the threaded hole B2-2 of the fixed bed cover 1. Inject 5mL min into the cavity 3 of the fixed bed through t...

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Abstract

The invention discloses an H-type fixed-bed carbon dioxide reduction electrolytic cell and its application. The electrolytic cell consists of three parts, the anode assembly, the cathode assembly, and the electrolyte membrane separating the two, and is suitable for granular CO 2 Electrochemical activity test, gas phase product analysis and liquid phase product analysis of RR catalyst. Its anode assembly consists of an anode chamber, an oxygen-evolving anode, and connectors for anode fixing and anode chamber sealing; the cathode assembly consists of a cathode chamber, a reference electrode, a fixed bed cover, a fluid distributor, a granular electrocatalyst, a fixed The bed cavity, the fixed bed base, the current collector, and the connectors to realize the sealing of the cathode chamber and the fixing of the electrodes are composed. Wherein, the fixed bed cathode main unit includes. The structural advantage of this electrolytic cell lies not only in its rich three-dimensional cathode network, but also by virtue of the rich CO 2 High-speed flow of electrolyte enables reactant CO 2 The timely supply and the stability of the ion concentration at the electrode solution interface, in CO 2 The field of RR has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, and relates to an H-type fixed-bed carbon dioxide reduction electrolytic cell and its application. Background technique [0002] CO 2 Electroreduction reaction (CO 2 RR) can convert CO under normal pressure and near normal temperature 2 Direct conversion into fuels and useful chemicals is a key technology to realize the "carbon cycle" in nature and alleviate many environmental problems. However, CO 2 The practical application of RR technology requires not only electrocatalysts with good activity and high selectivity, and efficient and stable reaction interfaces, but also electrochemical reactors—electrolytic cells—with a certain processing scale and high space-time conversion efficiency. [0003] Whipple et al. (Electrochemical and Solid-State Letters, 2010, 13(9), B109-B111) designed only KHCO 3 Liquid layer is electrolyte CO 2 The structural advantage of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C25B3/26C25B9/19C25B11/075C25B11/02
CPCC25B1/00C25B11/04C25B11/02C25B3/25C25B9/19
Inventor 毛庆曹自强郭唱刘松徐可一毛媛欣李冰玉赵健黄延强
Owner DALIAN UNIV OF TECH