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Iron-modified low-temperature denitration SCR catalyst and preparation method thereof

A technology of SCR catalyst and low-temperature denitrification, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., and can solve problems such as narrow reaction temperature window, poor sulfur resistance and water resistance, and restricted catalytic efficiency , to achieve the effects of improving activity and stability, improving sulfur and water resistance, and increasing relative content

Inactive Publication Date: 2018-12-14
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although manganese-based SCR catalysts have high activity, their inherent shortcomings such as narrow reaction temperature window, poor resistance to sulfur and water, and easy deactivation still seriously restrict their catalytic effectiveness.

Method used

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  • Iron-modified low-temperature denitration SCR catalyst and preparation method thereof
  • Iron-modified low-temperature denitration SCR catalyst and preparation method thereof
  • Iron-modified low-temperature denitration SCR catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] An iron-modified low-temperature denitrification SCR catalyst with high sulfur and water resistance,

[0066] The preparation method is as follows:

[0067] (1) Slowly add 5ml of butyl titanate to 13ml of absolute ethanol, stir vigorously on a magnetic stirrer for 20min to obtain liquid A;

[0068] (2) Mix 10ml of absolute ethanol, 2ml of acetic acid, and 1ml of water to obtain liquid B;

[0069] (3) Slowly add liquid B to the vigorously stirred liquid A at a rate of 0.5ml / min. After the addition, continue to stir for 2 hours to obtain a mixed liquid, and add 100-200 mesh porous silica gel balls to the above mixed liquid , keep stirring until a transparent or translucent gel is formed;

[0070] (4) Place the gel prepared in the previous step at room temperature for 12 hours for aging, and then place it in a blast oven at 80° C. to dry to obtain a dried gel;

[0071] (5) Grinding the dried gel with a mortar, then putting it into a muffle furnace and calcining at 550° ...

Embodiment 2

[0078] An iron-modified low-temperature denitrification SCR catalyst with high sulfur and water resistance,

[0079] The preparation method is as follows:

[0080] (1) Slowly add 5ml of butyl titanate to 13ml of absolute ethanol, stir vigorously on a magnetic stirrer for 20min to obtain liquid A;

[0081] (2) Mix 10ml of absolute ethanol, 2ml of acetic acid, and 1ml of water to obtain liquid B;

[0082] (3) Slowly add liquid B to the vigorously stirred liquid A at a rate of 0.5ml / min. After the addition, continue to stir for 2 hours to obtain a mixed liquid, and add 100-200 mesh porous silica gel balls to the above mixed liquid , keep stirring until a transparent or translucent gel is formed;

[0083] (4) Place the gel prepared in the previous step at room temperature for 12 hours for aging, and then place it in a blast oven at 80° C. to dry to obtain a dried gel;

[0084] (5) Grinding the dried gel with a mortar, then putting it into a muffle furnace and calcining at 550° ...

Embodiment 3

[0091] An iron-modified low-temperature denitrification SCR catalyst with high sulfur and water resistance,

[0092] The preparation method is as follows:

[0093] (1) Slowly add 5ml of butyl titanate to 13ml of absolute ethanol, stir vigorously on a magnetic stirrer for 20min to obtain liquid A;

[0094] (2) Mix 10ml of absolute ethanol, 2ml of acetic acid, and 1ml of water to obtain liquid B;

[0095] (3) Slowly add liquid B to the vigorously stirred liquid A at a rate of 0.5ml / min. After the addition, continue to stir for 2 hours to obtain a mixed liquid, and add 100-200 mesh porous silica gel balls to the above mixed liquid , keep stirring until a transparent or translucent gel is formed;

[0096] (4) Place the gel prepared in the previous step at room temperature for 12 hours for aging, and then place it in a blast oven at 80° C. to dry to obtain a dried gel;

[0097] (5) Grinding the dried gel with a mortar, then putting it into a muffle furnace and calcining at 550° C....

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Abstract

The invention relates to the field of the environmental protection technology and SCR catalysts, in particular to an iron-modified low-temperature denitration SCR catalyst, a preparation method thereof and the application thereof to flue gas treatment. The iron-modified low-temperature denitration SCR catalyst is a MnCoCeFe oxide catalyst, and is prepared through loading modification and sulfationtreatment by using titanium dioxide and a 100-200 mesh porous silica gel sphere as a composite carrier, wherein the loading modification is achieved by modifying the composite carrier by using manganese salt, iron salt, cerium salt and cobalt salt as metal element precursors; the sulfation treatment is achieved by impregnating the composite carrier obtained after the loading modification with a sulfuric acid solution. By the preparation method, the sulfur resistance and the water resistance of a Mn-based catalyst can be improved, the reaction temperature window can be widened, and the activity and the stability of the catalyst can be improved at the same time. The catalyst can be popularized, and is applicable to various SCR technologies so as to meet the urgent needs for flue gas denitrification catalysts in China.

Description

technical field [0001] The invention relates to the fields of environmental protection technology and SCR catalysts, in particular to an iron-modified low-temperature denitrification SCR catalyst, a preparation method thereof, and an application thereof in flue gas treatment. Background technique [0002] Nitrogen oxides (NOx), as one of the main pollutants in the atmosphere, are mainly emitted through mobile and stationary sources. Mobile source emissions mainly come from vehicle exhaust; stationary source emissions mainly come from coal-fired boilers, waste incineration, etc. A large amount of NOx emissions will cause great harm to the environment, not only can cause acid rain, ozone pollution, photochemical smog, but also the secondary fine particle pollutants formed by it can also be used as a precursor of eutrophication in surface water to destroy the stability of water quality and soil structure , leading to deeper environmental problems. Not only that, the high conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/8892B01J2523/00B01J2523/3712B01J2523/72B01J2523/842B01J2523/845
Inventor 欧阳峰李登葵洪德高张长亮邱露
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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