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Flue gas denitrating integral catalyst with aluminium base ceramic as carrier and preparation thereof

A monolithic catalyst, aluminum-based ceramic technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Simple preparation process and good thermal stability

Inactive Publication Date: 2008-08-06
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few domestic patents on flue gas denitrification catalysts

Method used

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  • Flue gas denitrating integral catalyst with aluminium base ceramic as carrier and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1)Al 2 o 3 Sol preparation

[0032] Dissolve 20g of pseudo-boehmite powder in 285ml of deionized water, add dropwise about 15g of 68% concentrated nitric acid 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.

[0033] (2)Al 2 o 3 Application of the second carrier layer

[0034] The 6.57g pretreated alumina porcelain is impregnated in the Al prepared in step (1) 2 o 3 In the sol, take it out and dry it naturally in the shade for 24 hours, then bake it in a muffle furnace at 500 °C for 3 hours, repeat the dipping, drying and baking once until the required carrier load is reached, that is, the Al 2 o 3 The second carrier layer, based on the mass of the first carrier, has a mass percentage of 7.3%;

[0035] (3) Preparation of active component impregnation solution

[0036] 10g Ce(NO 3 ) 3 .6H 2 Ce(NO 3 ) 3 solution;

[0037] (4) Active CeO 2 load

[0038] Coated Al in step (2) 2 o 3 The sam...

Embodiment 2

[0040] (1)Al 2 o 3 Sol preparation

[0041]Dissolve 20g of pseudo-boehmite powder in 285ml of deionized water, add dropwise about 12g of 68% concentrated nitric acid while stirring, and then heat to 80°C, so that the pH of the prepared sol is 1.1 and the relative density is 1.16.

[0042] (2)Al 2 o 3 Application of the second carrier layer

[0043] 6.57g pretreated ATS ceramics were impregnated in the Al prepared in step (1) 2 o 3 In the sol, take it out and dry it in a blast drying oven at 80°C for 10 hours, and then bake it in a muffle furnace at 500°C for 3 hours to coat Al 2 o 3 The second carrier layer, based on the mass of the first carrier, has a mass percentage of 5.1%;

[0044] (3) Preparation of active component impregnation solution

[0045] 10g Ce(NO 3 ) 3 .6H 2 Ce(NO 3 ) 3 solution;

[0046] (4) Active CeO 2 load

[0047] Coated Al in step (2) 2 o 3 The sample of the second carrier coating is immersed in the solution prepared in step (3). After ...

Embodiment 3

[0049] (1)Al 2 o 3 Sol preparation

[0050] Dissolve 20g of pseudo-boehmite powder in 285ml of deionized water, add dropwise about 11.8g of 68% concentrated nitric acid 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.

[0051] (2)Al 2 o 3 Application of the second carrier layer

[0052] 6.58g pretreated cordierite porcelain was impregnated in the Al prepared in step (1) 2 o 3 In the sol, take it out and dry it at 100°C for 9 hours in a blast drying oven, then bake it in a muffle furnace at 500°C for 3 hours, repeat the impregnation, drying and firing once until the required carrier load is reached, that is, the Al 2 o 3 The second carrier layer, based on the mass of the first carrier, has a mass percentage of 9.4%;

[0053] (3) Preparation of active component impregnation solution

[0054] 10g Ce(NO 3 ) 3 .6H 2 Ce(NO 3 ) 3 solution;

[0055] (4) Active CeO 2 load

[0056] Coated Al in step (2) ...

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Abstract

The invention relates to a flue gas denitration integral type catalyst using an aluminum-based ceramic as a carrier and a preparation method thereof. The invention uses the aluminum-based ceramic as a first carrier, an alumina is used as a second carrier, and CeO2 which is added with proper amounts of doped metal oxides is used as an active constituent. The first carrier is used as a benchmark, the content mass percentage of the alumina is 3 to 40wt percent and the load content mass percentage of the CeO2 and the doped metal oxides which is used as the active constituent is 1 to 26wt percent. The adopted preparation method is to impregnate the Ce salt and the doped metal salt composite solution to prepare an active catalytic component coating after impregnating the aluminum-based ceramic with an alumina sol and being roasted driedly to prepare an alumina coating. Compared with the prior art, the flue gas denitration integral type catalyst and the preparation method thereof not only improve the mechanicalness and the heat stability of the catalyst carrier and reduce the loading amount of the active constituent, but also are environmental protection without a secondary pollution, improve the activity of the catalyst and expand a window of activity temperature in a low temperature.

Description

technical field [0001] The invention relates to a monolithic flue gas denitrification catalyst with aluminum-based ceramics as a carrier 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/06B01J37/025B01D53/56
Inventor 祝社民沈岳松
Owner NANJING UNIV OF TECH
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