A kind of porous carbon material SO2 electrochemical oxidation catalyst and its preparation method and application

A technology of porous carbon materials and oxidation catalysts, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of low activity and low activity, increase electrochemical oxidation ability, and increase micropore content and specific surface area, important application value and use prospect

Active Publication Date: 2019-05-14
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

Carbon materials are less active when directly used as catalysts, and carbon black is directly used for SO 2 Less active in electrochemical oxidation

Method used

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  • A kind of porous carbon material SO2 electrochemical oxidation catalyst and its preparation method and application
  • A kind of porous carbon material SO2 electrochemical oxidation catalyst and its preparation method and application
  • A kind of porous carbon material SO2 electrochemical oxidation catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The desulfurization performance of the catalyst was tested in a three-electrode system. The coated disk electrode was heated in 0.5M H 2 SO 4 Cyclic voltammetry (CV) activation: CV-100mV / s-15 cycles, 3 times; test initial activity: CV-50mV / s-3 cycles; constant potential (CA) 0.8V test desulfurization performance: CA-0.8V -High-speed rotation-1600r / min, after 10 minutes, quickly stop and start to remove the charging current, continue the constant potential test, add 10mL of 1g / L Na prepared by 0.5M sulfuric acid to the system after 10 minutes with a syringe with a thin soft catheter 2 SO 3 solution, in N 2 In the double stirring system of disturbance and 1600r / min rotation, the catalyst reacts to a certain amount of SO at 0.8V 2 Generate an instantaneous current step response. Change the constant potential value to test the catalytic desulfurization performance of the catalyst at 1.2V. Comparison of the desulfurization performance of 20% Pt / C and prepared catalysts...

Embodiment 2

[0039] The desulfurization performance of the catalyst was tested in a three-electrode system, and the electrodes were exposed to 0.5M H 2 SO 4 Activate in: CV-100mV / s-15 circles, 3; test the initial activity CV-50mV / s-3 circles; replace the electrolyte solution with 1g / L Na prepared by 0.5M sulfuric acid 2 SO 3 Solution, electrode rotation speed 1600r / min, linear voltage scanning rate 5mV / s, compare the desulfurization performance of 20% Pt / C and prepared catalyst at different potentials as figure 2 As shown, it can be seen that although the desulfurization performance of the prepared catalyst is relatively low compared with Pt at a lower potential, it already has an obvious catalytic oxidation of SO 2 Excellent performance, strong desulfurization ability at high potential.

Embodiment 3

[0041] The desulfurization performance of the catalyst was tested in a three-electrode system, and the electrodes were exposed to 0.5M H 2 SO 4 Medium activation: CV-100mV / s-15 circles, 3 times; test the initial activity CV-50mV / s-3 circles; replace the electrolyte solution with 1g / L Na prepared by 0.5M sulfuric acid 2 SO 3 Solution, carry out CV test; rotate the electrode 1600r / min, test the desulfurization performance of the catalyst, the test results are compared with image 3 As shown, it can be seen that the prepared catalyst has a positive effect on SO 2 It has obvious electrochemical oxidation ability, and its desulfurization ability is greatly enhanced when the electrode rotates at high speed. On the one hand, during the rotation process, the adsorption products on the electrode surface can be quickly detached, which is beneficial to the subsequent reaction; on the other hand, due to the high-speed rotation process, the concentration difference of the reactants on t...

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Abstract

The present invention relates to a kind of porous carbon material SO 2 The electrochemical oxidation catalyst and its preparation method and application, specifically, obtain a loose porous metal-free carbon material catalyst through the process of pretreatment, doping and two heat treatments on the amorphous carbon material. Through the process of constant potential and dynamic potential, test the SO of the prepared catalyst 2 Electrochemical oxidation ability and the catalyst's reaction to SO at an applied potential 2 In-situ response; tests show that this catalyst has obvious desulfurization effect. The porous carbon material catalyst prepared by amorphous carbon material increases the micropore area by 33%-40%, the micropore volume increases by 28%-30%; the outer pore area increases by 55%-60%, and the total specific surface area increases by 48%. ‑50%, and some elements are doped on the surface of the porous carbon material catalyst, and some functional groups are modified. SO at constant potential of the catalyst 2 The electrochemical oxidation effect is good, in the gas phase and liquid phase SO 2 The field of electrochemical oxidation has great application potential, which can solve the increasingly severe SO 2 Pollution issues are positive.

Description

technical field [0001] The invention relates to the field of electrochemical oxidation desulfurization, in particular to a 2 Porous carbon material with electro-chemical oxidation ability, conductive adsorption catalysis, its preparation method and application. Background technique [0002] SO 2 It is one of the main air pollutants, mainly from the combustion of fossil fuels, such as the flue gas emitted by power plants and boilers. The traditional flue gas desulfurization technology mainly uses alkaline absorbents to capture and chemically remove SO from flue gas. 2 ; The sulfur content in the tail gas treated by these desulfurization processes is still high, and further deep removal of SO 2 It is difficult and uneconomical, so it is of great significance to study the deep desulfurization of electrochemical oxidation. [0003] The current research on electrochemical oxidation desulfurization mostly focuses on the liquid phase desulfurization system; however, Junxiang Zh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18B01J27/14B01J27/24B01D53/50B01D53/32
Inventor 侯明赵卿王胜利蒋尚峰邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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