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Preparation method of wear-resistant denitration catalyst for cement denitration and prepared denitration catalyst

A technology of denitration catalyst and anti-wear aid, applied in the field of denitration catalyst, can solve the problems of wear, high dust content of flue gas, catalyst blockage and the like

Pending Publication Date: 2021-04-20
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problems of high dust content in flue gas, catalyst clogging and serious wear in the cement industry

Method used

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  • Preparation method of wear-resistant denitration catalyst for cement denitration and prepared denitration catalyst
  • Preparation method of wear-resistant denitration catalyst for cement denitration and prepared denitration catalyst

Examples

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Effect test

Embodiment 1

[0031] A method for preparing a wear-resistant denitration catalyst for cement denitration, comprising the following steps:

[0032] (1) Add 5 parts of magnesium chloride to 150 parts of deionized water to obtain magnesium chloride solution, add 100 parts of TiO 2 , while stirring, gradually add ammonia water dropwise to PH = 11, stir for 30 minutes, filter with suction, dry at 60°C, roast at 300°C for 6h, and grind to below 300 mesh to obtain MgO-modified TiO 2 ;

[0033] (2) Get 100 parts of modified TiO in step 1 2 , add 100 parts of 25wt% phosphoric acid solution, heat at 180°C for 16h, filter, dry at 60°C, and calcined at 300°C to obtain phosphoric acid-modified TiO 2 - MgO composite component A;

[0034] (3) Take the waste three-way catalyst powder below 300 mesh, completely immerse it in the aluminum sol with a mass fraction of 25wt% for 10min, then carry out freeze-drying. ℃ roasting to obtain the waste three-way catalyst powder B of alumina coating;

[0035] (4) ...

Embodiment 2

[0041] A method for preparing a wear-resistant denitration catalyst for cement denitration, comprising the following steps:

[0042] (1) Add 3 parts of magnesium chloride to 90 parts of deionized water to obtain magnesium chloride solution, add 100 parts of TiO 2 , while stirring, gradually add ammonia water dropwise to PH = 11, stir for 30 minutes, filter with suction, dry at 60°C, roast at 300°C for 6h, and grind to below 300 mesh to obtain MgO-modified TiO 2 ;

[0043] (2) get 100 parts of modified TiO in step (1) 2 , adding 100 parts of 15wt% phosphoric acid solution, heated at 180°C for 16h, filtered, dried at 60°C, and calcined at 300°C to obtain phosphoric acid-modified TiO 2 - MgO composite component A;

[0044] (3) Take the waste three-way catalyst powder below 300 mesh, completely immerse it in the aluminum sol with a mass fraction of 25wt% for 10min, then carry out freeze-drying. ℃ roasting to obtain the waste three-way catalyst powder B of alumina coating;

[...

Embodiment 3

[0051] A method for preparing a wear-resistant denitration catalyst for cement denitration, comprising the following steps:

[0052] (1) Add 3 parts of magnesium chloride to 90 parts of deionized water to obtain magnesium chloride solution, add 100 parts of TiO 2 , while stirring, gradually add ammonia water dropwise to PH = 11, stir for 30 minutes, filter with suction, dry at 60°C, roast at 300°C for 6h, and grind to below 300 mesh to obtain MgO-modified TiO 2 ;

[0053] (2) Get 100 parts of modified TiO in step 1 2 , adding 100 parts of 15wt% phosphoric acid solution, heated at 180°C for 16h, filtered, dried at 60°C, and calcined at 300°C to obtain phosphoric acid-modified TiO 2 - MgO composite component A;

[0054] (3) Take the waste three-way catalyst powder below 300 mesh, completely immerse it in the aluminum sol with a mass fraction of 25wt% for 10min, then carry out freeze-drying. ℃ roasting to obtain the waste three-way catalyst powder B of alumina coating;

[00...

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Abstract

The invention discloses a preparation method of a wear-resistant denitration catalyst for cement denitration, relates to the technical field of environment-friendly materials, and aims to solve the problems of high dust content of flue gas, catalyst blockage and serious wear in the cement industry. Titanium dioxide modified by phosphoric acid modified magnesium oxide is used as a carrier, waste ternary catalyst waste with an aluminum oxide coating layer on the surface, silicon carbide and other strength auxiliary agents are used, and a magnesium component is introduced, so that the titanium dioxide carrier is easier to sinter at a low temperature, phosphoric acid hydrothermal pretreatment is adopted, the overall acidity of the carrier is enhanced, and the acid reduction effect of a magnesium component of the sintering aid is counteracted; the waste ternary catalyst waste with the aluminum oxide coating layer on the surface and silicon carbide are introduced to further enhance the wear resistance of a mechanical strength agent of the catalyst; aluminum phosphate is introduced to enhance the bonding strength of the components in each catalyst, and the catalyst with high strength and wear resistance is obtained; and then an apparent structure of the honeycomb catalyst is changed on the basis, and the anti-blocking property of the catalyst is enhanced.

Description

technical field [0001] The invention relates to the technical field of environmental protection materials, in particular to a method for preparing a wear-resistant denitration catalyst for cement denitration and the prepared denitration catalyst. Background technique [0002] Nitrogen oxides (NOx) are one of the causes of pollution phenomena such as smog and acid rain, and have become the key targets of air pollution control. According to statistics, the cumulative national cement output in 2019 was 2.33 billion tons, and NOx emissions from the cement industry accounted for about 10% to 12% of the country's total NOx emissions, making it the third largest pollution source after thermal power and motor vehicles. With the introduction of ultra-low emission standards in some provinces and cities, the emission standards of nitrogen oxides in various provinces and cities have changed from 50mg / m 3 to 150mg / m 3 All are covered, and ultra-low emissions have become an inevitable t...

Claims

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Application Information

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IPC IPC(8): B01J27/228B01J35/00B01J37/00B01D53/86B01D53/56
Inventor 潘有春梁燕王光应许晓龙赵羽崔鹏
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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