Fume denitration composite catalyst using titanium-base ceramics as carrier and preparation method thereof

A composite catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problems of easy pulverization of the catalyst, poor wear resistance, etc., and achieve good thermal stability and strong water vapor resistance , enhance the effect of solid acidity

Active Publication Date: 2009-03-11
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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  • Fume denitration composite catalyst using titanium-base ceramics as carrier and preparation method thereof
  • Fume denitration composite catalyst using titanium-base ceramics as carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1)Al 2 o 3 -SiO 2 Composite sol preparation

[0025] Dissolve 20g of pseudo-boehmite powder in 285ml of deionized water, add about 10g of concentrated nitric acid with a concentration of 68% dropwise while stirring, and then heat to 80°C, so that the pH of the prepared sol is 0.5 and the relative density is 1.15. According to orthoethyl silicate (TEOS): ethanol: H 2 O:H + = 1: 6.4: 3.8: 0.085 molar ratio, thoroughly mix ethyl orthosilicate and dehydrated alcohol, add the mixture of deionized water and glacial acetic acid (acid catalyst) drop by drop under the strong stirring of magnetic stirrer, add dropwise After completion, the reaction mixture was stirred and refluxed at a constant temperature of 70°C for 50 minutes, and a stable SiO 2 Sol. Finally, according to the molar ratio of the element Al:Si being 3:1, mix aluminum glue and silica gel, and stir at a constant temperature of 70°C for 2 hours to obtain a stable Al 2 o 3 -SiO 2Composite sol;

[0026] (2...

Embodiment 2

[0034] (1)Al 2 o 3 -SiO 2 Composite sol preparation

[0035] Dissolve 20g of pseudo-boehmite powder in 285ml of deionized water, add about 9g of 68% concentrated nitric acid dropwise while stirring, and then heat to 70°C, so that the pH of the prepared sol is 1.1 and the relative density is 1.16. According to orthoethyl silicate (TEOS): ethanol: H 2 O:H + =1:5:4:0.08 molar ratio, thoroughly mix ethyl orthosilicate and absolute ethanol, add the mixture of deionized water and nitric acid (acid catalyst) drop by drop under strong stirring with a magnetic stirrer, and dropwise Finally, the reaction mixture was stirred and refluxed at a constant temperature of 70°C for 40 minutes, and a stable SiO 2 Sol. Finally, according to the molar ratio of the element Al:Si being 1:1, mix the aluminum gel and silica gel, and stir at a constant temperature of 70°C for 2.5 hours to obtain a stable Al 2 o 3 -SiO 2 Composite sol;

[0036] (2)Al 2 o 3 -SiO 2 Loading of the second carri...

Embodiment 3

[0043] (1)Al 2 o 3 -SiO 2 Composite sol preparation

[0044] Dissolve 20g of pseudo-boehmite powder in 285ml of deionized water, add about 8.9g of 68% concentrated nitric acid dropwise while stirring, and then heat to 80°C, so that the pH of the prepared sol is 1.5 and the relative density is 1.17. According to orthoethyl silicate (TEOS): ethanol: H 2 O:H + =1:7:4:0.085 molar ratio, thoroughly mix ethyl orthosilicate and absolute ethanol, add the mixture of deionized water and sulfuric acid (acid catalyst) drop by drop under strong stirring with a magnetic stirrer, and dropwise Finally, after the reaction mixture was stirred and refluxed at 65 °C for 75 min, a stable SiO 2 Sol. Finally, according to the molar ratio of the element Al:Si being 5:1, mix aluminum glue and silica gel, and stir at 80°C for 4 hours to obtain a stable Al 2 o 3 -SiO 2 Composite sol;

[0045] (2)Al 2 o 3 -SiO 2 Loading of the second carrier layer of composite oxide

[0046] Immerse 8g of p...

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Abstract

The invention relates to a flue gas denitration composite catalyst and the preparation method thereof and pertains to the technical field of environment-friendly catalytic material and air pollution treatment. The invention is characterized in that aluminum-based or silicon-based ceramics is taken as a first carrier, aluminum-silicon composite oxide is taken as a second carrier, and cerium-zirconium composite metal oxide is taken as the catalyst active component. The aluminum-based or silicon-based ceramics is infused in the aluminum-silicon composite sol, after preparing a carrier coating by drying and baking, then the carrier coating is infused in cerium-zirconium composite solution for preparing the coating of active catalyst components. Compared with the prior art, the invention not only improves the activity and the chemical stability of the catalyst and enlarges the catalysis activity temperature window, but also improves the mechanical performance and thermal stability of the catalyst carrier, is environment-friendly and cheap, has no secondary pollution and lowers the loading quantity of the active components.

Description

technical field [0001] The invention relates to a 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 supporte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01J23/10B01J21/06B01J32/00B01J37/02
Inventor 祝社民沈岳松周晨丘泰
Owner NANJING UNIV OF TECH
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