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Porous carbon material SO2 electrochemical oxidation catalyst, preparation method and applications thereof

A technology of porous carbon materials and oxidation catalysts, which is 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, and achieve increased micropore content and specific surface area, electrochemical The effect of increased oxidation capacity, important application value and prospect of use

Active Publication Date: 2017-06-16
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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  • Porous carbon material SO2 electrochemical oxidation catalyst, preparation method and applications thereof
  • Porous carbon material SO2 electrochemical oxidation catalyst, preparation method and applications thereof
  • Porous carbon material SO2 electrochemical oxidation catalyst, preparation method and applications thereof

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 is in 0.5M H 2 SO 4 Cyclic voltammetry (CV) activation in medium: 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, stop quickly and start to remove the charging current, continue the constant potential test, add 10mL of 0.5M sulfuric acid 1g / L Na to the system after 10min 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 at two potentials figure 1 As shown, it can be seen...

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 Activation in medium: CV-100mV / s-15 circles, 3; test 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 porous carbon material SO2 electrochemical oxidation catalyst, a preparation method and applications thereof, specifically to a loose porous metal-free carbon material catalyst obtained by carrying out pretreatment, doping and two heat treatments on an amorphous carbon material. According to the present invention, through a constant potential process and an electrokinetic potential process, the SO2 electrochemical oxidation ability of the prepared catalyst and the in situ response of the catalyst to SO2 during the external applying of the potential are tested, and the testing results show that the catalyst has a significant desulfurization effect; the micro-pore area of the porous carbon material catalyst prepared from the amorphous carbon material is increased by 33-40%, the pore volume of the micro-pores is increased by 28-30%, the area of the outer pore is increased by 55-60%, the total specific surface area is increased by 48-50%, a variety of elements are doped on the surface of the porous carbon material catalyst, and a plurality of functional groups are modified on the surface of the porous carbon material catalyst; and the SO2 electrochemical oxidation effect of the catalyst is good at the constant potential, and the catalyst has great application potential in the gas-phase and liquid-phase SO2 electrochemical oxidation field, and provides the positive significance for the solving of the increasingly severe SO2 pollution problem.

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 Applications(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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