SCR flue gas denitration composite catalyst and preparation method thereof

A composite catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of poor wear resistance, easy powdering of catalysts, etc., and achieve good thermal stability, low cost, anti- Strong water vapor effect

Active Publication Date: 2009-01-28
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the catalyst is easy to pulverize and has poor wear resistance

Method used

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  • SCR flue gas denitration composite catalyst and preparation method thereof
  • SCR flue gas denitration composite catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) TiO 2 -ZrO 2 -Al 2 o 3 -CeO 2 Composite sol preparation

[0021] First prepare liquid A with 17ml of butyl titanate and 25ml of absolute ethanol, then add 12ml of glacial acetic acid, 5ml of water, and 30ml of absolute ethanol in sequence to prepare liquid B, then add A dropwise into B, and stir for 20 minutes. Then add zirconium oxychloride and cerium nitrate and stir for 40 minutes according to the molar ratio of titanium, zirconium and cerium elements in a ratio of 3:1:2 to obtain a mixed sol of titanium, zirconium and cerium; dissolve 20g of pseudoboehmite powder in 285ml of Add about 10 g of 68% concentrated nitric acid dropwise to the deionized water while stirring, and then heat to 80° C., so that the pH value of the prepared sol is 0.5 and the relative density is 1.15. Finally, the aluminum sol was added into the titanium-zirconium-cerium mixed sol according to the molar ratio of the titanium-aluminum element being 3:1, and mixed and stirred for 40 minu...

Embodiment 2

[0026] (1) TiO 2 -ZrO 2 -Al 2 o 3 -CeO 2 Composite sol preparation

[0027] First prepare liquid A with 17ml of butyl titanate and 17ml of absolute ethanol, then add 12ml of glacial acetic acid, 5ml of water, and 38ml of absolute ethanol in sequence to prepare liquid B, then add A dropwise into B, and stir for 25 minutes. Then add zirconium oxychloride and cerium nitrate and stir for 30 minutes according to the molar ratio of titanium, zirconium and cerium elements of 1:0.5:0.5 to obtain a mixed sol of titanium, zirconium and cerium; dissolve 20g of pseudoboehmite powder in 285ml of Add about 10 g of 68% concentrated nitric acid dropwise to the deionized water while stirring, and then heat to 70° C., so that the pH value of the prepared sol is 1.1 and the relative density is 1.16. Finally, the aluminum sol was added into the titanium-zirconium-cerium mixed sol according to the molar ratio of the titanium-aluminum element being 2:1, and mixed and stirred for 30 minutes to ...

Embodiment 3

[0031] (1) TiO 2 -ZrO 2 -Al 2 o 3 -CeO 2 Composite sol preparation

[0032] First prepare liquid A with 17ml of butyl titanate and 34ml of absolute ethanol, then add 12ml of glacial acetic acid, 5ml of water, and 25ml of absolute ethanol in sequence to prepare liquid B, then add A dropwise into B, and stir for 25 minutes. Then add zirconium oxychloride and cerium nitrate according to the molar ratio of titanium, zirconium and cerium in the ratio of 1:1:2 and stir for 50 minutes to obtain a mixed sol of titanium, zirconium and cerium; dissolve 20g of pseudoboehmite powder in 285ml of Add about 8.9 g of 68% concentrated nitric acid dropwise to the deionized water while stirring, and then heat to 80° C., so that the pH value of the prepared sol is 1.5 and the relative density is 1.17. Finally, the aluminum sol was added into the titanium-zirconium-cerium mixed sol according to the molar ratio of the titanium-aluminum element being 1:2, and mixed and stirred for 50 minutes to...

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Abstract

The invention relates to a compound catalyst for SCR flue gas denitration and a preparation method thereof, pertaining to the technical fields of environmental protection catalytic materials and atmosphere pollution controlling. The compound catalyst takes aluminum-based, titanium-based or zirconium-based ceramics as a carrier and titanium-zirconium-aluminum-cerium complex metal oxide as an active ingredient of the compound catalyst. The preparation method adopted includes: the aluminum-based, titanium-based or zirconium-based ceramics is impregnated in a titanium-zirconium-aluminum-cerium complex colloidal sol, and then dried and roasted to prepare compound catalyst active coatings. Compared with the prior art, the compound catalyst not only promotes the activity and the chemical stability of the catalyst and extends the temperature window of the catalytic activity, but also enhances the mechanical and thermal stability of a catalyst carrier, is environment protective and cheap without secondary pollution, prolongs the service life of the catalyst and lowers the load of the active ingredient.

Description

technical field [0001] The invention relates to an SCR flue gas denitrification composite catalyst and a preparation method thereof, belonging to the fields of air pollution control technology and environmental protection catalytic materials. Background technique [0002] Among the numerous flue gas denitrification methods, selective catalytic reduction (SCR) denitrification technology has been widely used because of its high denitrification efficiency. At present, the SCR denitrification equipment of large and medium-sized thermal power plants in my country is all imported, and the price is very expensive (the denitrification catalyst for a 600MW unit costs about 40 million and needs to be replaced every two years). Flue gas denitrification catalysts without independent intellectual property rights have become my country's environmental protection The "coreless pain" in the field. Commercial SCR denitration catalysts are mainly V 2 o 5 As the active ingredient, TiO 2 sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/16B01J21/06B01D53/56
Inventor 祝社民沈岳松许健丘泰
Owner NANJING UNIV OF TECH
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