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Preparation method of manganese dioxide nanosheet/carbon nanotube core-shell structure denitration catalyst

A technology of denitrification catalyst and carbon nanotubes, which is applied in the field of nanomaterial preparation and environmental protection, can solve the problems that active component particles are easy to agglomerate and it is difficult to ensure the dispersion of active components, and achieve simple preparation process, good low-temperature denitrification performance, easy The effect of the operation

Active Publication Date: 2014-10-01
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the impregnation method is mainly used in the preparation of catalysts to load the active components on the carrier. The particles of the active components are easy to agglomerate, and it is difficult to ensure that the active components are evenly dispersed on the surface of the carrier.

Method used

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  • Preparation method of manganese dioxide nanosheet/carbon nanotube core-shell structure denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 0.1 g of potassium permanganate in 250 mL of deionized water to form a concentration of 2.5×10 -3 mol / L potassium permanganate solution, then add 0.2 g single-walled carbon nanotubes into the above solution, ultrasonically disperse for 0.5 h, wherein the mass ratio of potassium permanganate:carbon nanotubes is 0.9:1, then add hydrochloric acid In the above solution, adjust the pH value to 2, raise the temperature of the above solution to 60°C, reflux for 2 h under magnetic stirring, separate after cooling to room temperature, wash, and then dry to obtain the manganese dioxide nanosheet / carbon nanosheet Tube denitrification catalyst. The catalyst has a core-shell structure, the manganese dioxide nano-sheet is the shell, the carbon nano-tube is the core, and the manganese dioxide nano-sheet is uniformly coated on the surface of the carbon nano-tube.

[0021] Catalyst evaluation: Grind and sieve the prepared catalyst, take 20-40 mesh particles, put them into a f...

Embodiment 2

[0023] Dissolve 0.4 g of potassium permanganate in 500 mL of deionized water to form a concentration of 5 × 10 -3 mol / L potassium permanganate solution, then add 0.1 g multi-walled carbon nanotubes into the above solution, ultrasonically disperse for 1 h, wherein the mass ratio of potassium permanganate:carbon nanotubes is 7.3:1, then add oxalic acid In the above solution, adjust the pH value to 3, raise the temperature of the above solution to 70°C, reflux for 3 h under magnetic stirring, separate after cooling to room temperature, wash, and then dry to obtain the manganese dioxide nanosheet / carbon nanosheet Tube denitrification catalyst. The catalyst has a core-shell structure, the manganese dioxide nano-sheet is the shell, the carbon nano-tube is the core, and the manganese dioxide nano-sheet is uniformly coated on the surface of the carbon nano-tube.

[0024] Catalyst evaluation: Grind and sieve the prepared catalyst, take 20-40 mesh particles, put them into a fixed-bed ...

Embodiment 3

[0026] Dissolve 1 g of potassium permanganate in 1000 mL of deionized water to form a concentration of 6 × 10 -3 mol / L potassium permanganate solution, then add 1.4 g of multi-walled carbon nanotubes into the above solution, ultrasonically disperse for 1.5 h, wherein the mass ratio of potassium permanganate:carbon nanotubes is 1.3:1, then add acetic acid In the above solution, adjust the pH value to 4, raise the temperature of the above solution to 80°C, reflux for 4 h under magnetic stirring, separate after cooling to room temperature, wash, and then dry to obtain the manganese dioxide nanosheet / carbon nanosheet Tube denitrification catalyst. The catalyst has a core-shell structure, the manganese dioxide nano-sheet is the shell, the carbon nano-tube is the core, and the manganese dioxide nano-sheet is uniformly coated on the surface of the carbon nano-tube.

[0027] Catalyst evaluation: Grind and sieve the prepared catalyst, take 20-40 mesh particles, put them into a fixed-...

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Abstract

The invention relates to a preparation method of a manganese dioxide nanosheet / carbon nanotube core-shell structure denitration catalyst, which belongs to the field of environmental protection catalytic materials. The catalyst of the invention is prepared by a reflux method, and the manganese dioxide nanosheets are uniformly coated on the carbon nanotubes, and the nitrogen oxides can be selectively catalytically reduced to nitrogen and water at a certain temperature by using ammonia as a reducing agent. The preparation method of the catalyst of the invention is simple, and the low-temperature activity is good. The catalyst prepared by the invention has excellent removal effect on nitrogen oxides in flue gas. The catalyst synthesized by the invention can be applied to the treatment of nitrogen oxides in flue gas discharged from coal-fired power plants, garbage incinerators, steel mills and the like.

Description

technical field [0001] The invention relates to a preparation method of a manganese dioxide nanosheet / carbon nanotube core-shell structure denitration catalyst, which belongs to the field of nanomaterial preparation technology and environmental protection technology. Background technique [0002] The flue gas emitted by coal-fired power plants, steel mills, etc. contains a large amount of nitrogen oxides (NO x ), mainly NO and NO 2 Existence in the form of pollution will cause environmental problems such as acid rain, greenhouse effect, and ozone layer destruction, which will not only damage the ecological environment of the earth, but also cause great harm to human health. Therefore, flue gas denitrification technology is the focus and difficulty of research in the field of air pollution control in my country. [0003] At present, the most widely used and mature denitrification technology in the world is the selective catalytic reduction (SCR) denitrification technology,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
Inventor 张登松施利毅方程李红蕊张剑平
Owner SHANGHAI UNIV
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