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SO2 depolarization electrolytic tank and operation method thereof

An operation method and electrolytic cell technology, applied in electrolytic processes, electrolytic components, cells, etc., can solve problems such as membrane electrode assembly SDE electrolytic cell failure, proton passing capacity decline, resistance increase, etc., to achieve fine particles, strong maintainability Sexuality and the effect of preventing performance decline

Pending Publication Date: 2021-07-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of this invention is to provide a kind of SO 2 Depolarization electrolysis cell and method of operation thereof, designed to address existing SO 2 Depolarized electrolytic cells and the following problems in their operation: SO in the anode area 2 Across the PEM into the cathode side, a reduction reaction occurs to generate sulfur elements, which accumulate between the PEM membrane of the membrane electrode assembly and the cathode catalyst layer. As the elemental sulfur at this position continues to increase, the membrane electrode assembly will "swell" , resulting in an increase in resistance and a decrease in the ability of protons to pass through, which eventually leads to the failure of the membrane electrode assembly and even the entire SDE electrolytic cell

Method used

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  • SO2 depolarization electrolytic tank and operation method thereof
  • SO2 depolarization electrolytic tank and operation method thereof
  • SO2 depolarization electrolytic tank and operation method thereof

Examples

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Effect test

Embodiment 1

[0042] Using the scheme of the present invention, the SO 2 Depolarize the electrolytic cell. The membrane electrode assembly of the electrolytic cell is composed of an anode catalyst layer and a proton selective permeable membrane. A cathode sealing ring is wrapped around the supporting body on the cathode side, and an anode sealing ring is wrapped around the supporting body on the anode side. The anode side of the electrolytic cell has an anode material inlet and an anode material outlet; the cathode side has a product hydrogen discharge port. The membrane electrode assembly is composed of an anode catalyst layer, a proton selective permeable membrane, and a cathode side support is loaded with a catalyst.

[0043] The effective membrane area of ​​each cell is 50cm 2 , where the proton selective permeation membrane is selected from DuPont's Nafion117 proton exchange membrane, and the anode side is sprayed with a Pt / C catalyst layer, and the amount of Pt used is 0.4mg / cm 2 ...

Embodiment 2

[0050] SO in Example 1 2 Depolarize the electrolytic cell, remove the cathodic washing liquid storage tank, cathode washing pump, cathodic washing liquid recovery storage tank, and auxiliary pipelines and valves equipped on the cathode side. image 3 As shown in the configuration, the cathode side is equipped with a pressure relief port 21, a pressure relief valve 22, a pressure relief drainage recovery tank 23 and ancillary pipelines.

[0051] At 60°C, with the above SO 2 The depolarized electrolytic cell performs electrolysis operation, and the anode material is saturated SO 230wt.% sulfuric acid, the external direct current keeps the current constant at 25A, the total cell voltage is 5.6V, and the hydrogen production rate in the cathode area is measured to be ~60L / h.

[0052] The cathode side of the electrolytic cell operates under the condition of 1.5 atmospheric pressure, and the initial setting pressure of the pressure relief drainage recovery tank is 1 atmospheric pre...

Embodiment 3

[0054] Using the solution of the present invention, the SO 2 Depolarize the electrolytic cell. The membrane electrode assembly of the electrolytic cell is composed of an anode catalyst layer and a proton selective permeable membrane. The anode side of the electrolytic cell has an anode material inlet and outlet; the cathode side has two product hydrogen discharge ports. The membrane electrode assembly is composed of an anode catalyst layer, a proton selective permeable membrane, and a cathode side support is loaded with a catalyst.

[0055] The effective membrane area of ​​each cell is 100cm 2 , where the proton selective permeable membrane is selected from DuPont's Nafion115 proton exchange membrane, and its anode side has a Pt / C catalyst layer, and the amount of Pt used is 0.3mg / cm 2 , the cathode side of the proton-selective permeable membrane has no catalyst layer. The cathode side support body is 2.5mm thick graphite felt (porosity 92%, carbon content 99.9%), is loade...

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Abstract

The invention discloses an SO2 depolarization electrolytic tank and an operation method thereof, and belongs to the technical field of electrochemistry and chemical engineering. The electrolytic tank comprises one or more single cells which are arranged in sequence, a membrane electrode assembly of the electrolytic tank is composed of an anode catalyst layer and a proton selective permeable membrane, a membrane electrode is not provided with a cathode catalyst layer, and a cathode side supporting body made of materials such as graphite felt is loaded with a catalyst. According to the operation method, the cathode side is washed through an active washing or passive pressure relief method, potential elemental sulfur accumulation is reduced, and the performance of the electrolytic tank can be effectively kept. According to the invention, the damage of the membrane electrode assembly caused by the reduction reaction of SO2 across the PEM membrane in the anode region can be avoided, and the membrane electrode assembly has the advantages of long service life and strong maintainability.

Description

technical field [0001] The present invention relates to a kind of SO 2 The depolarization electrolytic cell and its operating method belong to the technical field of mixed sulfur cycle hydrogen production. Background technique [0002] SO 2 Depolarization electrolysis (SDE) is one of the key steps in the mixed sulfur cycle hydrogen production (HyS-cycle). As the simplest thermochemical water splitting process, the mixed sulfur cycle contains only two reactions, one of which is a thermochemical reaction—sulfuric acid decomposition reaction; and the other is an electrochemical reaction—that is, the SDE process. The reaction formulas of the above two reactions are as follows: [0003] h 2 SO 4 → SO 2 +H 2 O+1 / 2O 2 [0004] 2H 2 O+SO 2 →H 2 SO 4 +H 2 [0005] The above two reactions are combined, and the net reaction is water splitting to generate hydrogen and oxygen. [0006] It can be seen that SDE is the hydrogen production step of the mixed sulfur cycle, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B9/23C25B1/04C25B15/00
CPCC25B15/00Y02E60/36
Inventor 陈崧哲张平王来军
Owner TSINGHUA UNIV
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