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Fume denitration composite catalyst 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 , The effect of increasing the specific surface area

Active Publication Date: 2011-11-16
NANJING TECH UNIV
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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 and preparation method thereof
  • Fume denitration composite catalyst and preparation method thereof
  • Fume denitration composite catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Al 2 O 3 -SiO 2 Preparation of composite sol

[0025] First 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 value of the prepared sol is 0.5 and the relative density is 1.15. According to tetraethyl orthosilicate (TEOS): ethanol: H 2 O:H + =1: 6.4: 3.8: 0.085 molar ratio, fully mix ethyl orthosilicate and absolute ethanol, add dropwise a mixture of deionized water and glacial acetic acid (acidic catalyst) under strong stirring with a magnetic stirrer, add dropwise After the reaction mixture was stirred and refluxed at a constant temperature of 70 °C for 50 min, stable SiO was obtained. 2 sol. Finally, according to the molar ratio of element Al:Si of 3:1, the aluminum glue and silica gel were mixed and stirred at a constant temperature of 70 °C for 2 hours to obtain stable Al 2 O 3 -SiO 2composite sol;

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Embodiment 2

[0034] (1) Al 2 O 3 -SiO 2 Preparation of composite sol

[0035] First dissolve 20g of pseudo-boehmite powder in 285ml of deionized water, add about 9g of concentrated nitric acid with a concentration of 68% dropwise 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. According to tetraethyl orthosilicate (TEOS): ethanol: H 2 O:H + =1: 5: 4: 0.08 molar ratio, fully mix ethyl orthosilicate and absolute ethanol, add dropwise a mixture of deionized water and nitric acid (acidic catalyst) under strong stirring with a magnetic stirrer, and complete the dropwise addition After the reaction mixture was stirred and refluxed at a constant temperature of 70 °C for 40 min, stable SiO was obtained. 2 sol. Finally, according to the molar ratio of element Al:Si of 1:1, the aluminum glue and silica gel were mixed, and stirred at a constant temperature of 70 ° C for 2.5 hours, that is, stable Al was obtained. 2 O 3 -...

Embodiment 3

[0043] (1) Al 2 O 3 -SiO 2 Preparation of composite sol

[0044] First dissolve 20g of pseudo-boehmite powder in 285ml of deionized water, add about 8.9g of concentrated nitric acid with a concentration of 68% dropwise 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. According to tetraethyl orthosilicate (TEOS): ethanol: H 2 O:H + =1:7:4:0.085 molar ratio, fully mix ethyl orthosilicate and absolute ethanol, add the mixture of deionized water and sulfuric acid (acidic catalyst) dropwise under strong stirring with a magnetic stirrer, and the dropwise addition is completed. After the reaction mixture was stirred and refluxed at a constant temperature of 65 °C for 75 min, stable SiO was obtained. 2 sol. Finally, according to the molar ratio of element Al:Si of 5:1, the aluminum glue and silica gel were mixed and stirred at a constant temperature of 80 °C for 4 hours to obtain stable Al 2 O 3 -SiO 2 com...

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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 bydrying 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 denitration 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 many flue gas denitration methods, selective catalytic reduction (SCR) denitration technology has been widely used due to its high denitration efficiency. At present, the SCR denitration equipment of large and medium-sized thermal power plants in my country are all imported, and the price is very expensive (the denitration catalyst for a 600MW unit costs about 40 million yuan and needs to be replaced every two years). The flue gas denitration catalyst without independent intellectual property rights has 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 supported catalyst. with NH 3 , CO...

Claims

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Application Information

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