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Manganese-based low-temperature denitration catalyst taking TiO2-SiO2 as carrier and preparation method thereof

A low-temperature denitration and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of poisoning, catalyst activity deactivation, and high cost

Active Publication Date: 2013-08-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many patents for SCR denitration catalysts that have been applied for. Judging from the published patents, there are mainly V 2 o 5 -WO 3 / TiO 2 , MnOx-CeO 2 / TiO 2 However, the catalyst of the vanadium-tungsten-titanium system has a high denitrification rate only at 300-400°C, and is not suitable for use at low temperatures. It has a strong poisoning effect, and it is easy to cause catalyst activity deactivation. Therefore, it is of great significance to study catalysts with high denitrification activity and strong resistance to alkali metal poisoning under low temperature conditions for the wide application of this low-temperature denitrification catalyst.

Method used

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  • Manganese-based low-temperature denitration catalyst taking TiO2-SiO2 as carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A TiO 2 The preparation of the supported manganese-based denitration catalyst (mass ratio Mn:Ti=0.4:1) includes the following steps

[0019] In the first step, 6ml of anhydrous acetic acid was added to 68g of tetrabutyl titanate, stirred by magnetic force for 10 minutes, and recorded as solution A.

[0020] In the second step, solution A was added dropwise to 220ml of absolute ethanol, stirred for 25 minutes, and finally recorded as solution B.

[0021] In the third step, add 28.6g of 50% (mass percentage concentration) manganese nitrate solution into 110ml of absolute ethanol, then add 18ml of deionized water, stir for 20 minutes, and record it as C solution.

[0022] In the fourth step, the C solution in the third step is added dropwise to the B solution, put into a water bath at 40°C and stirred until a gel is formed.

[0023] Step 5: Take the formed gel out of the water bath, age at room temperature for 20 hours, pour it into an evaporating dish, put it in a vacuu...

Embodiment 2

[0025] A TiO 2 -SiO 2 The preparation of manganese-based denitration catalyst (Mn:(Ti+Si)=0.6:1) as a composite support includes the following steps

[0026] In the first step, add 3ml of anhydrous acetic acid to 34g of ethyl orthosilicate, magnetically stir for 10 minutes, and record it as solution A; add 3ml of anhydrous acetic acid to 27g of tetrabutyl titanate, and magnetically stir for 10 minutes , recorded as solution B.

[0027] In the second step, solution A is added dropwise to 220ml of absolute ethanol, and after stirring for 25 minutes, solution B is added dropwise, and after stirring for 25 minutes, it is recorded as solution C.

[0028] In the third step, add 49.4g of 50% (mass percentage concentration) manganese nitrate solution into 110ml of absolute ethanol, then add 7ml of deionized water, stir for 20 minutes, and record it as D solution.

[0029] In the fourth step, add the D solution in the third step to the C solution dropwise, put it in a water bath at ...

Embodiment 3

[0032] A TiO 2 -SiO 2 The preparation of manganese-based denitration catalyst (Mn:(Ti+Si)=0.8:1) as a composite support includes the following steps

[0033] In the first step, add 3ml of anhydrous acetic acid to 34g of ethyl orthosilicate, magnetically stir for 10 minutes, and record it as solution A; add 3ml of anhydrous acetic acid to 27g of tetrabutyl titanate, and magnetically stir for 10 minutes , recorded as solution B.

[0034] In the second step, solution A is added dropwise to 220ml of absolute ethanol, and after stirring for 25 minutes, solution B is added dropwise, and after stirring for 25 minutes, it is recorded as solution C.

[0035] In the third step, add 65.2g of 50% (mass percentage concentration) manganese nitrate solution into 110ml of absolute ethanol, stir for 20 minutes, and record it as D solution.

[0036] In the fourth step, add the D solution in the third step to the C solution dropwise, put it in a water bath at 40°C and stir until a gel is form...

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Abstract

The invention relates to a manganese-based low-temperature denitration catalyst taking TiO2-SiO2 as a carrier and a preparation method thereof, belonging to the field of environmental catalysis and environmental protection. According to the manganese-based low-temperature denitration catalyst, a MnOx / TiO2-SiO2 catalyst is prepared by adopting a sol-gel method, wherein the mass percentage of SiO2 in the composite carrier is 40-60%, and the mass ratio of Mn to Ti+Si is (0.5-1.0): 1. The manganese-based low-temperature denitration catalyst is characterized in that due to the addition of SiO2, the specific surface area of the carrier is greatly increased, and the dispersion and stability of active substances on the surface of the carrier are benefited; and the TiO2-SiO2 is taken as the composite carrier, so that the alkali metal poisoning resistance of the catalyst can be improved. An active ingredient is low in cost, is non-toxic and can have good denitration catalysis activity at a lower temperature, so that the catalyst is applicable to the denitration catalysis of NOx of a low-temperature environment of a cement kiln after dust removal.

Description

technical field [0001] The invention belongs to the field of environmental catalytic materials and environmental protection, and specifically relates to an SCR denitrification catalyst under low-temperature conditions after cement kiln waste heat power generation and dust removal. Background technique [0002] NO x and SO 2 It is the main pollutant of the atmosphere and the main source of acid rain. Human activities, fuel combustion, industrial production, etc. may produce NO x , NO x Mainly includes N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 etc. NOx pollution has become an increasingly serious global problem. In the past decade, my country's SO 2 Emissions have been extensively governed and effectively controlled. The NOx pollution emission control work is in the ascendant in my country. During the "Twelfth Five-Year Plan" period, NOx was included in the binding index system for the first time, and the total emission must be reduced by 10%. In 2010, my ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/90B01D53/56
Inventor 崔素萍马晓宇罗小根张良静郭红霞刘启栋
Owner BEIJING UNIV OF TECH
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