Application for nitrogen-doped graphene used as catalyst in removal of SO2 through electrooxidation method

A nitrogen-doped graphene, electro-oxidation technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of complex preparation process, high cost of electro-oxidation catalysts, poor catalytic activity, etc., to achieve Simple preparation process, excellent electrochemical catalytic activity, and cheap raw materials

Active Publication Date: 2016-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the current existing SO 2 To solve the problems of high cost, complex preparation process or poor catalytic activity of electro-oxidation catalysts, the development of low-cost and high-activity SO 2 Significance of electro-oxidation catalyst

Method used

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  • Application for nitrogen-doped graphene used as catalyst in removal of SO2 through electrooxidation method
  • Application for nitrogen-doped graphene used as catalyst in removal of SO2 through electrooxidation method
  • Application for nitrogen-doped graphene used as catalyst in removal of SO2 through electrooxidation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 0.1 g of sucrose and 6 g of urea and dissolve in 7 g of deionized water, and stir until completely dissolved. Heat and dry at 60°C on a hot table to obtain a white solid, and continue heating at 60°C until the white solid is completely dry. Transfer the white solid to a quartz boat, put it in a tube furnace, heat it from room temperature to 1000°C at a heating rate of 4°C / min, bake it at 1000°C for 1h, and continuously pass it into Ar for protection. The Ar flow rate is 200sccm, and the final preparation The obtained nitrogen-doped graphene (NG-1000). from TEM figure 1 It can be seen that nitrogen-doped graphene NG-1000 is a thin layer structure, figure 2 At 2θ=25°, there are obvious graphite characteristic peaks, image 3 EDS spectrum shows the existence of N element.

[0045] Weigh 2 mg of nitrogen-doped graphene NG-1000, 1 mL of isopropanol, and 50 μL of 5% Nafion solution in a 10 mL sample bottle, and disperse evenly by ultrasonication for 30 minutes to pre...

Embodiment 2

[0047] The experiment was carried out with the same method as in Example 1, except that the high-temperature calcination temperature was 800°C. from Figure 5 It can be seen that the prepared nitrogen-doped graphene NG-800 has a thin layer structure. Image 6 It shows that there are obvious graphite characteristic peaks at 2θ=25°, Figure 7 shows the presence of C and N elements. use it as SO 2 When electrooxidizing the catalyst, from Figure 8 It can be seen from the cyclic voltammetry curve that the nitrogen-doped graphene NG-800 on SO 2 It has electro-oxidation catalytic activity, and the oxidation current peak appears around 1.2V (vs. SHE).

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Abstract

The invention relates to application for nitrogen-doped graphene used as a catalyst in removal of SO2 through an electrooxidation method. The nitrogen-doped graphene is prepared through the following steps: dissolving a carbon contained precursor and a carbon and nitrogen contained precursor in water, then subjecting the obtained mixture to drying under heating until a solid is obtained, and subjecting the above-mentioned solid to high-temperature calcination in a nitrogen or argon atmosphere so as to obtain the nitrogen-doped graphene. The nitrogen-doped graphene provided by the invention has simple preparation process, can be obtained through a solid-phase reaction at normal pressure and high temperature, uses common equipment, is low in preparation cost, facilitates to industrial production, shows excellent electrochemical catalytic activity when used as the catalyst for the electrooxidation reaction of SO2, and can be extensively applied in the field of electrochemical desulfurization and purification of air.

Description

technical field [0001] The invention relates to a nitrogen-doped graphene used as a catalyst to remove SO by electrooxidation 2 Specifically, it is a kind of uniform mixing of carbon-containing precursors and nitrogen-containing carbon precursors, and high-temperature roasting under gas protection to prepare nitrogen-doped graphene as a catalyst, and to remove SO by electro-oxidation. 2 Applications. Background technique [0002] SO 2 It is a colorless gas with a pungent odor. It is denser than water, easy to liquefy and soluble in water, and is one of the main pollutants in the atmosphere. SO 2 It has serious harm to human beings, animals, plants and nature. my country began to study industrial desulfurization technology in the 1970s, which involved activated carbon adsorption, direct spraying of lime / limestone in the furnace, fluidized bed limestone and spray drying and other dry flue gas desulfurization technologies, as well as calcium-alkali method, magnesium-alkali ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/50
Inventor 侯明穆聪梁栋赵卿洪绍景邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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