Wear-resistant SCR (Selective Catalytic Reduction) denitration catalyst and preparation method thereof

A denitrification catalyst and wear-resistant technology, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of wear-resistant strength cracking, collapse, catalyst wear, etc., to improve compactness and prolong service life The effect of improving the life and wear resistance

Active Publication Date: 2013-08-14
CHONGQING YUANDA CATALYST MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ash content in Chinese coal is very high, and the hardening of the end face alone cannot completely solve the problem of catalyst wear, especially in the case of uneven flow field distribution, the catalyst will be broken due to insufficient wear resistance under the washing of high ash flue gas , collapse and other non-renewable physical damage

Method used

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  • Wear-resistant SCR (Selective Catalytic Reduction) denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation method of the wear-resistant SCR denitration catalyst of the present embodiment comprises the following steps:

[0019] 1) Add 1.9kg aluminum isopropoxide to 1mol / L nitric acid solution to prepare hydrated alumina sol;

[0020] 2) Dry mix 39kg of titanium dioxide, 0.6kg of ammonium metavanadate and 2.65kg of ammonium metatungstate powder, and then add hydrated alumina sol, deionized water and oxalic acid to fully mix and stir;

[0021] 3) Add 7.4kg of silica sol with a mass fraction of 25% to the material obtained in step 2);

[0022] 4) Mix the materials obtained in step 3) evenly and add 2kg of structural additives;

[0023] 5) Extruding the material obtained in step 4), drying the carrier blank at 110° C. for 48 hours, and calcining at 550° C. for 10 hours to obtain the wear-resistant SCR denitration catalyst.

[0024] The main components and mass parts of the wear-resistant SCR denitration catalyst prepared in this example are: 89 parts of titanium...

Embodiment 2

[0026] The preparation method of the wear-resistant SCR denitration catalyst of the present embodiment comprises the following steps:

[0027] 1) Add 3.4kg aluminum isopropoxide to 1mol / L nitric acid solution to prepare hydrated alumina sol;

[0028] 2) Dry mix 33kg of titanium dioxide, 0.55kg of ammonium metavanadate and 2.4kg of ammonium metatungstate powder evenly, then add hydrated alumina sol, deionized water and oxalic acid to fully mix and stir;

[0029] 3) Add 12kg of silica sol with a mass fraction of 25% to the material obtained in step 2);

[0030] 4) Mix the materials obtained in step 3) evenly and add 2kg of structural additives;

[0031] 5) Extruding the material obtained in step 4), drying the carrier blank at 110° C. for 48 hours, and calcining at 550° C. for 10 hours to obtain the wear-resistant SCR denitration catalyst.

[0032] The main components and mass parts of the wear-resistant SCR denitration catalyst prepared in this example are: 85 parts of titani...

Embodiment 3

[0034] The preparation method of the wear-resistant SCR denitration catalyst of the present embodiment comprises the following steps:

[0035] 1) Add 8.3kg aluminum isopropoxide to 1mol / L nitric acid solution to prepare hydrated alumina sol;

[0036] 2) Dry mix 36kg of titanium dioxide, 0.55kg of ammonium metavanadate and 2.4kg of ammonium metatungstate powder evenly, then add hydrated alumina sol, deionized water and oxalic acid to fully mix and stir;

[0037] 3) Add 6.6kg of silica sol with a mass fraction of 25% to the material obtained in step 2);

[0038] 4) Mix the materials obtained in step 3) evenly and add 2kg of structural additives;

[0039] 5) Extruding the material obtained in step 4), drying the carrier blank at 110° C. for 48 hours, and calcining at 550° C. for 10 hours to obtain the wear-resistant SCR denitration catalyst.

[0040] The main components and mass parts of the wear-resistant SCR denitration catalyst prepared in this example are: 85 parts of titan...

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Abstract

The invention discloses a wear-resistant SCR (Selective Catalytic Reduction) denitration catalyst and a preparation method thereof. The wear-resistant SCR denitration catalyst comprises the following main components in parts by weight: 80-90 parts of titanium dioxide, 0.5-3 parts of vanadium pentoxide, 3-7 parts of tungsten trioxide, 1-5 parts of aluminum oxide and 3-8 parts of silicon dioxide. The preparation method comprises the following steps of: (1) adding aluminum isopropoxide into a nitric acid solution to prepare hydrated alumina sol; (2) uniformly and dryly mixing the titanium dioxide powder, ammonium metavanadate powder and ammonium metatungstate powder, then adding the hydrated alumina sol, deionized water and oxalic acid, and mixing and stirring the mixture; (3) adding silica sol into the material obtained in the step (2); (4) uniformly mixing the material obtained in the step (3), and then, adding a structure promoter; and (5) extruding the material obtained in the step (4), and drying and roasting the carrier blank. The wear resistant property of the wear-resistant SCR denitration catalyst disclosed by the invention is improved by 20-40%, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to the technical field of SCR denitration catalysts, in particular to a wear-resistant SCR denitration catalyst and a preparation method thereof. Background technique [0002] The high ash content of flue gas from coal-fired power plants in my country causes catalyst wear, blockage, and poisoning. Catalyst blockage and poisoning can restore activity through regeneration. Catalyst wear destroys the physical structure of the catalyst and cannot be regenerated, making wear an important factor in catalyst consumption. [0003] At present, the wear-resistant technology of honeycomb denitration catalysts generally adopts end face hardening, and the hardening solution uses ammonium metavanadate, ammonium metatungstate, aluminum dihydrogen phosphate, etc. (PCT / JP2007 / 068061, 200810147802.X), which improves the catalyst's resistance grinding performance. However, the ash content in Chinese coal is very high, and the hardening of the end f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 樊永生张静魏丽斯段明华邓巧莲黄锐刘红辉席文昌成丹李云涛洪永江赵双梁其燕
Owner CHONGQING YUANDA CATALYST MFG
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