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A kind of oxidation-reduction lead electrocatalytic material and preparation method thereof and application in electrocatalytic reduction of sulfur dioxide

An electrocatalytic material, sulfur dioxide technology, applied in the direction of metal material coating process, electrodes, electrolytic components, etc., can solve the problems of large specific surface area of ​​petal-shaped structure, poor selectivity of reducing to elemental sulfur, and more active site exposure, etc., to achieve Improve the selectivity of electrochemical catalysis, the selectivity advantage is obvious, and the effect of both environmental and economic benefits

Active Publication Date: 2022-04-08
CENT SOUTH UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0003] For the existing electrochemical reduction of SO 2 The method has the disadvantages of poor selectivity for reducing elemental sulfur and insufficient purity. The first object of the present invention is to provide a kind of oxidation-reduction lead electrocatalytic material, which has a special petal-like structure and morphology and contains Oxygen deficiency, the petal-like structure has a large specific surface area, strong physical adsorption capacity, and more active sites are exposed, and a small amount of oxygen doping can induce positively charged lead atoms to adsorb negatively charged SO 2 The electron-rich S atoms in the medium repel the positively charged protons, and can adsorb sulfur dioxide with high selectivity, thus having high-efficiency and high-selectivity electrocatalytic conversion of SO 2 capacity for elemental sulfur

Method used

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  • A kind of oxidation-reduction lead electrocatalytic material and preparation method thereof and application in electrocatalytic reduction of sulfur dioxide
  • A kind of oxidation-reduction lead electrocatalytic material and preparation method thereof and application in electrocatalytic reduction of sulfur dioxide
  • A kind of oxidation-reduction lead electrocatalytic material and preparation method thereof and application in electrocatalytic reduction of sulfur dioxide

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Experimental program
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Effect test

Embodiment 1

[0035] (1) Oxidation-reduction lead material preparation:

[0036] Take a high-purity lead sheet with a size of 15×10×0.3mm, clean it ultrasonically with acetone and ethanol solution, and immerse it in 10mL 2.66M NaOH and 10mL 0.13M (NH 4 ) 2 S 2 o 8 In the mixed solution, fully react for 10 minutes for pre-oxidation treatment. Subsequently, the material is placed at a high temperature (300° C. to 400° C.) and calcined for 50 minutes in an air atmosphere for oxidation treatment. The oxidized material is cleaned and dried to obtain a working electrode. An H-type electrolytic cell is used, and the cathode chamber and the anode chamber are separated by a DuPont N117 proton membrane. 0.08MNa 2 SO 4 As the electrolyte in the cathode and anode chambers, Pt as the counter electrode, and a saturated calomel electrode (SCE) as the reference electrode. The electrochemical reduction is carried out in 0~-1.5V cycle cv mode, the oxygen content is controlled to be about 5%, and the ox...

Embodiment 2

[0040] 50mL SO 2 The absorption liquid (sodium sulfite 0.08mol / L) is taken into the cathode chamber as the catholyte, 50mL of anhydrous sodium sulfate aqueous solution is used as the anolyte, and sulfuric acid is used to adjust the pH of the anode and cathode electrolytes (0.1, 0.3, 0.5, 0.7). The pure lead sheet or the OD-Pb material obtained at the calcination temperature of 350°C in Example 1 is used as the working electrode, Pt is used as the counter electrode, SCE is used as the reference electrode, the reduction voltage is -0.8V, the normal temperature water is circulated and cooled, and the electrolysis is stopped after 10min. Elemental sulfur is produced. Electrolysis to obtain a milky white or milky yellow suspension. The content of elemental sulfur in the solution was determined by a suspended solids analyzer. combine Figure 5 The results show that after the oxidation-reduction treatment, the faradaic efficiency of elemental sulfur is increased by nearly 20%, and...

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Abstract

The invention discloses an oxidation-reduction lead electrocatalytic material, a preparation method thereof and an application in the electrocatalytic reduction of sulfur dioxide. The method uses lead sheet as raw material to prepare oxidation-reduction lead electrocatalytic material through oxidation-reduction steps. The oxidation-reduction lead electrocatalytic material has a special petal-like structure and morphology, and is rich in oxygen vacancies, which has a high Electroreduction catalytic activity and reduction selectivity, using it to catalyze electroreduction of sulfur dioxide can generate elemental sulfur with high efficiency and high selectivity, and the product selectivity of elemental sulfur is high (up to 91.86%), and the preparation method of oxidation-reduction lead electrocatalytic material The operation is simple, the conditions are mild, and the cost is low, which is conducive to large-scale production.

Description

technical field [0001] The present invention relates to an oxidation-reduction lead electrocatalytic material, also relates to a method for preparing oxidation-reduction lead electrocatalysis material through oxidation + reduction, and relates to the use of oxidation-reduction lead electrocatalysis material SO 2 The method for converting high-efficiency and high-selectivity elemental sulfur with high economic value belongs to the field of resource management and recovery of non-ferrous smelting flue gas. Background technique [0002] The total amount of sulfur dioxide emissions in my country is large, widely distributed, low concentration, and difficult to control. It has become the main gaseous pollutant. With the surge in demand for environmental protection, SO 2 The recycling of resources has gradually become the consensus of the industry. Currently SO 2 The way of resource recovery is mainly in the form of sulfuric acid products, but sulfuric acid is a liquid dangerou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B11/052C25B1/01C23C22/60C23C8/10C25C1/18
CPCC25B11/04C25B1/00C23C22/60C23C8/10C25C1/18
Inventor 刘恢朱芳芳向开松刘旭东沈锋华柴立元闵小波林璋杨志辉王海鹰李青竹
Owner CENT SOUTH UNIV
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