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Method for preparing carbon nano-tube denitration catalyst with composite hierarchical structure

A denitration catalyst and carbon nanotube technology, applied in the field of carbon nanotube denitration catalysts, can solve the problems of limiting the popularization and application of manganese-based catalysts, catalyst deactivation, reduction of surface active sites, etc., and achieve low activity temperature, large activity window, low cost effect

Inactive Publication Date: 2015-09-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual flue gas, there is often a certain amount of sulfur dioxide, and manganese oxides are easy to react with sulfur dioxide to form sulfate, which will lead to a sharp decrease in surface active sites, thereby causing catalyst deactivation. This defect greatly limits the Popularization and application of manganese-based catalysts in practical industrial catalytic reactions

Method used

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  • Method for preparing carbon nano-tube denitration catalyst with composite hierarchical structure
  • Method for preparing carbon nano-tube denitration catalyst with composite hierarchical structure
  • Method for preparing carbon nano-tube denitration catalyst with composite hierarchical structure

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The configuration concentration is 1×10 -3 mol / L potassium permanganate solution, then add multi-walled carbon nanotubes with a mass ratio of 10:1 to potassium permanganate solution, and ultrasonically disperse for 0.2h. After the mixed solution is uniformly dispersed, use Acetic acid was used to adjust the pH value to 1, and then the mixed solution was heated to 60°C under vigorous stirring. o C is refluxed, and after reacting for 2 hours, the product is washed with deionized water and dried to obtain the manganese dioxide-carbon nanotube composite.

[0025] Add the prepared manganese dioxide-carbon nanotube composite into deionized water and ultrasonically disperse it for 0.2h. of ferrous chloride, then the mixed solution was heated to 60°C under vigorous stirring o C carries out surface replacement, after reacting for 0.5h, the product is washed by deionized water, and after drying, a denitrification catalyst with iron oxide-manganese dioxide-carbon nanotube compos...

Embodiment 2

[0029] The configuration concentration is 5×10 -3 mol / L potassium permanganate solution, then add multi-walled carbon nanotubes with a mass ratio of potassium permanganate of 15:1 into the potassium permanganate solution, and ultrasonically disperse for 0.4 h. After the mixed solution is uniformly dispersed, use Acetic acid was used to adjust the pH value to 1.5, and then the mixed solution was heated to 70 under vigorous stirring. o C is refluxed, and after reacting for 3 hours, the product is washed with deionized water and dried to obtain the manganese dioxide-carbon nanotube composite.

[0030] Add the prepared manganese dioxide-carbon nanotube composite into deionized water and ultrasonically disperse for 0.4h. of ferrous sulfate, then the mixed solution was heated to 60°C under vigorous stirring oC was subjected to surface replacement, and after 1 hour of reaction, the product was washed with deionized water and dried to obtain a denitration catalyst with a composite h...

Embodiment 3

[0034] The configuration concentration is 1×10 -2 mol / L potassium permanganate solution, then add multi-walled carbon nanotubes with a mass ratio of potassium permanganate of 20:1 into the potassium permanganate solution, and ultrasonically disperse for 0.6h. After the mixed solution is uniformly dispersed, use Acetic acid was used to adjust the pH value to 2, and then the mixed solution was heated to 70 under vigorous stirring. o C is refluxed, and after reacting for 4 hours, the product is washed with deionized water, and the manganese dioxide-carbon nanotube composite can be obtained after drying.

[0035] Add the prepared manganese dioxide-carbon nanotube composite into deionized water, ultrasonically disperse for 0.6h, and after the product is uniformly dispersed, add the manganese dioxide-carbon nanotube composite in a mass ratio of 0.3:1 to the solution of cobaltous chloride, then the mixed solution was heated to 70 o C was subjected to surface replacement, and after ...

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Abstract

The method relates to a method for preparing a carbon nano-tube denitration catalyst with a composite hierarchical structure and belongs to the field of environmental protection catalytic materials. The method comprises adding a multi-walled carbon nanotube in a mass ratio of (0.5-20):1 with potassium permanganate to a potassium permanganate solution, performing ultrasonic dispersion, using acetic acid to adjust the pH to 1-4, warning the mixed solution to 60-90 DEG C with stirring to perform backflow, reacting for 2-5 h and then washing a product through deionized water; after the drying, adding an obtained manganese dioxide-carbon nano-tube compound to deionized water, performing ultrasonic dispersion, adding a certain amount of bivalent metal salt in the solution, warming the mixed solution with stirring, carrying out surface replacement reaction, using deionized water to wash the product, and obtaining the carbon nano-tube denitration catalyst with the composite hierarchical structure after the drying. The catalyst has good efficiency of converting nitrogen oxides in flue gas. The catalyst can be applied to treatment of the nitrogen oxides in the flue gas emitted by fixed sources such as steel mills and coal-fired power plants.

Description

technical field [0001] The invention relates to a carbon nanotube denitrification catalyst with a composite hierarchical structure, belonging to the technical field of nitrogen oxide purification in environmental protection, and the catalyst can be used for removing nitrogen oxides emitted from fixed sources. Background technique [0002] With the development and progress of science and technology, human beings' dependence on and demand for energy has gradually increased, which has also resulted in increasingly serious nitrogen oxides (NO x ) emission issues. Excessive emissions of nitrogen oxides not only damage the earth's ecological environment, but also cause great harm to human health. Ammonia Selective Reduction (NH 3 -SCR) is currently the most widely used NO x removal technique, where V 2 o 5 -WO 3 / TiO 2 The catalyst is a denitrification catalyst that is mainly put into commercial application at present. However, it has disadvantages such as high catalytic a...

Claims

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Application Information

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IPC IPC(8): B01J23/889B82Y30/00B82Y40/00B01D53/56B01D53/86
Inventor 张登松施利毅蔡思翔李红蕊
Owner SHANGHAI UNIV
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