MnOx/graphene low-temperature SCR flue gas denitration catalyst, preparation method and applications thereof

A denitrification catalyst and graphene technology, which is applied in the field of environmental protection and environmental catalysis, can solve the problems of wasting energy consumption and achieve reasonable cost, excellent low-temperature SCR flue gas denitrification performance, and environmental friendliness

Active Publication Date: 2015-07-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the denitrification device is placed after the desulfurization and dust removal device, the SO can be reduced 2 and dust, but at this time the temperature of the flue gas will drop below 200°C. In order to avoid the waste of energy consumption by reheating the flue gas for the medium-temperature catalyst, the development of a low-temperature and high-efficiency SCR catalyst is of great significance to solve this problem.

Method used

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  • MnOx/graphene low-temperature SCR flue gas denitration catalyst, preparation method and applications thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of graphene oxide: disperse the prepared graphite oxide into deionized water, and obtain a graphene oxide suspension with a concentration of 2.0 mg / ml after ultrasonication for 120 min;

[0031] (2) Water bath heating reaction: dissolve 1.0 mmol of manganese acetate in 10 ml of deionized water and slowly add it dropwise to the above graphene oxide suspension with a rubber dropper, stir at room temperature for 20 min, and react in a water bath at 80 ° C for 5 h After the reaction, add ammonia water dropwise to the solution, adjust the pH of the solution to 10, and continue to stir for 30 minutes;

[0032] (3) Hydrothermal synthesis reaction: transfer the reacted solution in step (2) to a reactor for hydrothermal reaction at 120°C for 12 hours. After the reaction is completed, filter the solution and wash it with a large amount of deionized water. The filter cake was dried in a blast drying oven at 60°C for 12 hours;

[0033] (4) Activation: The sample ob...

Embodiment 2

[0035] (1) Preparation of graphene oxide: disperse the prepared graphite oxide into deionized water, and obtain a graphene oxide suspension with a concentration of 2.0 mg / ml after ultrasonication for 120 min;

[0036] (2) Water-bath heating reaction: dissolve 2.0 mmol of manganese acetate in 10 ml of deionized water and slowly add it dropwise to the above graphene oxide suspension with a rubber dropper, stir at room temperature for 20 min, and react in a water bath at 80 °C for 4 h After the reaction, add ammonia water dropwise to the solution, adjust the pH of the solution to 10, and continue to stir for 30 minutes;

[0037] (3) Hydrothermal synthesis reaction: transfer the solution after the reaction in step (2) to a 200ml reactor and place it in an oven for hydrothermal reaction at 140°C for 12 hours. After the reaction is completed, filter the solution, and use a large amount of deionized water After washing, place the filtered filter cake in a blast drying oven at 60°C fo...

Embodiment 3

[0040] (1) Preparation of graphene oxide: disperse the prepared graphite oxide into deionized water, and obtain a graphene oxide suspension with a concentration of 2.0 mg / ml after ultrasonication for 120 min;

[0041](2) Water-bath heating reaction: dissolve 3.0 mmol of manganese acetate in 10 ml of deionized water and slowly add it dropwise to the above graphene oxide suspension with a rubber dropper, stir at room temperature for 20 min, and react in a water bath at 80 °C for 3 h After the reaction, add ammonia water dropwise to the solution to adjust the pH of the solution to 10, and continue to stir for 30 minutes;

[0042] (3) Hydrothermal synthesis reaction: transfer the reacted solution in step (2) to the reaction kettle for hydrothermal reaction at 160°C for 12 hours, filter the solution after the reaction is completed, and wash with a large amount of deionized water, and the filtered The filter cake was dried in a blast drying oven at 60°C for 12 hours;

[0043] (4) A...

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Abstract

The invention discloses a MnOx / graphene low-temperature SCR flue gas denitration catalyst, a preparation method, and applications thereof. The preparation method comprises the following steps: taking oxidized graphene containing a great amount of oxygen-containing groups as the precursor, loading Mn to the graphene through a two-step water solution method, and finally burning the graphene to obtain the MnOx / graphene low-temperature SCR flue gas denitration catalyst; wherein the mass percentage of MnOx to graphene is 5 to 25%, in the MnOx / graphene low-temperature SCR flue gas denitration catalyst. The graphene, which has a unique planar extension structure and a large theoretical specific area, is taken as the carrier, and thus the dispersibility of active component MnOx is greatly improved, so the catalyst has a high low-temperature SCR flue gas denitration activity.

Description

technical field [0001] The invention belongs to the field of environmental protection and environmental catalysis, in particular to a MnO x / Graphene low-temperature SCR flue gas denitrification catalyst and its preparation method and application. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants that cause acid rain, photochemical smog, and ozone depletion, and has serious harm to human health and the ecological environment. How to effectively control and reduce NO x The emissions have attracted the attention of researchers from various countries. According to statistics, 70.9% of China's nitrogen oxide emissions in 2012 came from industrial sources of nitrogen oxide emissions such as electric power, thermal power production and supply industries, among which the nitrogen oxide emissions from thermal power plants accounted for 10% of the total nitrogen oxide emissions from industrial enterprises. 62.1%, is the largest emitter of nitro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/90B01D53/56
Inventor 黄碧纯焦金珍
Owner SOUTH CHINA UNIV OF TECH
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