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Urea supported carbon based denitration catalyst, preparation and application method thereof

A denitration catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as difficulty in controlling the amount of ammonia added, easy leakage of ammonia, difficulties in operation and storage, etc.

Inactive Publication Date: 2009-05-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is noticeable that ammonia appears in most of the technologies. Ammonia is highly corrosive and requires high requirements for pipeline equipment; it is difficult to control the amount of ammonia added in the denitrification process, which is likely to cause secondary pollution; ammonia Easy to leak, causing difficulties in handling and storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 0.5 g of F22 pitch-based spherical activated carbon (Shanghai Heda Carbon Co., Ltd.) with a particle size of 0.4-0.6 mm, and impregnate the pitch-based spherical activated carbon in urea aqueous solution (the concentration of urea is 0.049 g / ml) for 6h, followed by drying at 70°C for 6h, the catalyst can be prepared, wherein the loading of urea is 9%.

[0024] The prepared catalyst was installed in a fixed-bed reactor, and the temperature was raised to 30°C for ventilation. The simulated flue gas composition was: 500ppmNO, 21vol%O 2 , N 2 As balance gas, normal pressure operation, space velocity is 6000h -1 . The test result is: the stable conversion rate of NO is 61%, and the duration is 10h.

Embodiment 2

[0026] Weigh 0.5 g of F22 pitch-based spherical activated carbon with a particle size of 0.4-0.6 mm, and impregnate the pitch-based spherical activated carbon in urea aqueous solution (the concentration of urea is 0.068 g / ml) for 12 h by using an equal-volume impregnation method. After drying at ℃ for 12 hours, the catalyst can be prepared, and the loading amount of urea is 12%.

[0027] The prepared catalyst was installed in a fixed-bed reactor, and the temperature was raised to 30°C for ventilation. The simulated flue gas composition was: 500ppmNO, 21vol%O 2 , N 2 As balance gas, normal pressure operation, space velocity is 5000h -1 . The test result is: the stable conversion rate of NO is 53%, and the duration is 19h.

Embodiment 3

[0029] Weigh 0.5 g of F22 pitch-based spherical activated carbon with a particle size of 0.4-0.6 mm, and impregnate the pitch-based spherical activated carbon in urea aqueous solution (the concentration of urea is 0.026 g / ml) for 18 hours by using an equal-volume impregnation method. After drying at ℃ for 18 hours, the catalyst can be prepared, and the loading amount of urea is 5%.

[0030] The prepared catalyst was installed in a fixed-bed reactor, and the temperature was raised to 30°C for ventilation. The simulated flue gas composition was: 500ppmNO, 21vol%O 2 , N 2 As balance gas, normal pressure operation, space velocity is 6200h -1 . The test result is: the stable conversion rate of NO is 74%, and the duration is 5h.

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Abstract

The invention discloses a urea-carried carbon-based denitrification catalyst, as well as a preparation method and an application method thereof. The components in weight percentages of the denitrification catalyst are as follows: 75% to 99.9% of activated carbon carrier and 0.1% to 25% of urea. The preparation method adopts the incipient wetness impregnation technique and comprises the following steps: impregnating activated carbon carrier in a urea aqueous solution, standing, and drying to obtain the catalyst. The obtained catalyst is loaded in a fixed bed reactor under such conditions that the reaction temperature is controlled in the range from 30 DEG C to 90 DEG C, the normal-pressure flue gas is introduced, and the air speed ranges from 2000 / h to 12000 / h. Under the catalytic action of the activated carbon-based carrier, the NOx in the flue gas reacts with the urea to generate N2, CO2 and H2O. The urea-carried carbon-based denitrification catalyst has the advantages of environmental protection, no secondary pollution, recovery of activated carbon carrier, repeated use of urea, no need of water, strong resistance to flue gas erosion, no risk of catalyst poisoning, high denitrification rate, wide denitrification concentration range, wide application range and good market potential.

Description

technical field [0001] The invention relates to a carbon-based denitration catalyst loaded with urea and a preparation and application method thereof. technical background [0002] NOx (x=1, 2) is one of the main pollutants in the atmosphere. It mainly comes from the combustion of fossil fuels such as coal, oil, and natural gas used in production and life, and about 70% of it comes from the direct combustion of coal. The emission of NOx increases the oxidation of the atmosphere, leading to serious environmental problems and posing a huge threat to human health and the ecological environment. For example: NOx can poison the human body, damage plant growth, cause acid rain and acid fog, and lead to photochemical smog , Destruction of the ozone layer, etc. At present, my country's NOx emissions are estimated to be more than 10 million tons, but in view of the fact that my country's energy consumption will continue to grow with economic development in the future, NOx emissions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01D53/56
Inventor 乔文明王志王艳莉姜振平陈庆军詹亮梁晓怿凌立成
Owner EAST CHINA UNIV OF SCI & TECH
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