Preparation method of high-strength flue gas denitration catalyst

A denitrification catalyst, high-strength technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of insufficient catalytic activity, low acidity, and inability to fully play the role of the carrier, and achieve low cost , The preparation process is simple, the effect of high and low temperature catalytic activity

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw material of the catalyst is cheap and easy to obtain, but the co-precipitation method is used to make part of the titanium dioxide is covered by silicon dioxide, and the titanium dioxide cannot fully play the role of the carrier, and the catalyst does not contain sulfate, the acidity is low, and the catalytic activity is not high enough.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) TiO 2 -SiO 2 Preparation of composite carrier;

[0033] First, dissolve 0.4Kg of titanium sulfate and 0.2Kg of citric acid into 2L of deionized water to make a mixed solution; 2 Add to the above mixed solution for equal volume impregnation; dry at 80°C for 12 hours; bake at 400°C for 5 hours to obtain TiO 2 -SiO 2 Composite carrier.

[0034] (2) Loading of active ingredients and additives;

[0035] TiO prepared in step (1) 2 -SiO 2 The composite carrier was immersed in a mixed solution of 0.2M nickel nitrate, 0.15M ammonium metavanadate and 0.1M ammonium molybdate, taken out, dried at 120°C for 6 hours, and calcined at 450°C for 10 hours to obtain a denitration catalyst powder.

[0036] (3) Honeycomb body forming

[0037] Combine 80 parts of the denitrification catalyst powder prepared in step (2) with 6 parts of glass fiber, 0.1 part of wood pulp, 0.5 part of polyacrylamide, 2 parts of carboxymethyl cellulose, 8 parts of ammonia water, and 20 parts of deion...

Embodiment 2

[0040] (1) TiO 2 -SiO 2 Preparation of composite carrier;

[0041] First, dissolve 0.8Kg titanium sulfate and 0.4Kg citric acid into 2L of deionized water to make a mixed solution; 2 Add to the above mixed solution for equal volume impregnation; dry at 120°C for 6 hours; roast at 600°C for 1 hour to prepare TiO 2 -SiO 2 Composite carrier.

[0042] (2) Loading of active ingredients and additives;

[0043] TiO prepared in step (1) 2 -SiO 2 The composite carrier is immersed in a mixed solution of 0.3M cerium nitrate, 0.1M manganese nitrate and 0.4M tin tetrachloride, taken out, dried at 110°C for 12 hours, and calcined at 550°C for 5 hours to obtain a denitration catalyst powder.

[0044] (3) Honeycomb body forming

[0045] Combine 90 parts of the denitration catalyst powder prepared in step (2) with 4 parts of glass fiber, 0.2 parts of wood pulp, 1 part of polyacrylamide, 0.5 parts of carboxymethyl cellulose, 10 parts of ammonia water, and 10 parts of deionized water. A...

Embodiment 3

[0048] (1) TiO 2 -SiO 2 Preparation of composite carrier;

[0049] First, 2Kg titanium sulfate and 0.1Kg citric acid were dissolved in 2L deionized water to make a mixed solution; 4Kg SiO 2 Add to the above mixed solution for equal volume impregnation; dry at 110°C for 6 hours; roast at 620°C for 3 hours to obtain TiO 2 -SiO 2 Composite carrier.

[0050] (2) Loading of active ingredients and additives;

[0051] TiO prepared in step (1) 2 -SiO 2 The composite carrier is immersed in a mixed solution of 0.2M ammonium metavanadate and 0.1M ammonium metatungstate, taken out, dried at 120°C for 6 hours, and calcined at 450°C for 24 hours to obtain a denitration catalyst powder.

[0052] (3) Honeycomb body forming

[0053] Combine 75 parts of denitrification catalyst powder prepared in step (2) with 6 parts of glass fiber, 2 parts of wood pulp, 2 parts of polyacrylamide, 0.1 part of carboxymethyl cellulose, 5 parts of ammonia water, 40 parts of deionized water, etc. After se...

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Abstract

The invention discloses a preparation method of a high-strength flue gas denitration catalyst. The preparation method comprises the following steps: taking titanium sulfate as the titanium source and critic acid as the complexing agent to prepare a TiO2-SiO2 composite carrier through an impregnation method, loading an active component and an auxiliary agent on the TiO2-SiO2 composite carrier so as to obtain denitration catalyst powder, mixing the denitration catalyst powder with glass fiber, wood slurry, polyacrylamide, carboxymethyl cellulose, ammonia water, and deionized water, and then subjecting the mixture to processes of kneading, aging, extruding, drying, and burning so as to obtain a honeycomb denitration catalyst. The preparation method has the advantages of simple preparation technology, low cost, and tight combination between TiO2 and SiO2 in the composite carrier. The prepared denitration catalyst has the advantages of good mechanical strength, wear-resistant property, and catalytic activity.

Description

technical field [0001] The invention relates to a preparation method of a denitration catalyst, in particular to a preparation method of a high-strength ammonia selective catalytic reduction denitration catalyst. Background technique [0002] Nitrogen oxides from stationary sources (power plants, industrial boilers and refineries) (hereinafter referred to as NOx, mainly NO and NO 2 ) is the main pollutant in the atmosphere, which leads to the formation of acid rain and photochemical smog, and causes damage to the human respiratory system. Therefore, all countries in the world have established strict emission standards for NOx emissions. [0003] Stationary source NOx can be controlled by improving combustion methods and flue gas denitrification technologies. Improved combustion methods include LNB (low NOx burner), OFA (overfired air technology) and reburning technology, but the NOx removal rate of these methods Generally not high, can not meet the current emission standar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887B01J23/34B01J23/30B01J23/888B01J35/04B01D53/90B01D53/56
Inventor 王学海方向晨刘忠生刘新友杨爱霞
Owner CHINA PETROLEUM & CHEM CORP
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