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Flat-plate type high-temperature SCR (Selective Catalytic Reduction) denitration catalyst and preparation method thereof

A denitrification catalyst, flat-plate technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as loss, catalyst loss of denitrification activity, reduction of denitrification activity, etc.

Active Publication Date: 2015-07-01
北京华电光大环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this V 2 o 5 -WO 3 / TiO 2 Commercial catalysts are no longer applicable for two reasons: (1) V 2 o 5 At temperatures above 400 °C, the denitrification activity decreased significantly, and at the same time, it also caused a significant promotion of SO 2 Oxidation, NH 3 Decomposition, N 2 O formation and many other negative issues; at the same time at higher temperatures, V 2 o 5 Easy to volatilize and lose; (2) Anatase TiO 2 When the temperature exceeds 550 ° C, it will slowly transform to rutile type, and rutile type TiO 2 As a carrier, the catalyst will lose its denitrification activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) 1. measure the cerium nitrate of 12.61g, slowly drop into the deionized water of 160g; Measure the titanium tetrachloride of 4.41g in addition, slowly drop into the above-mentioned aqueous solution containing cerium nitrate; Slowly add ammonia water dropwise until the pH value reaches about 9, and the hydroxide precipitate is obtained and left for 24 hours; the above mixture is filtered, washed, and washed with AgNO 3 The solution was detected to have no precipitation; then it was dried in an ordinary blast drying oven at 110°C for 12 hours, and roasted in a muffle furnace at 550°C for 3 hours to obtain nano-CeO 2 -TiO 2 Composite oxide powder, wherein the Ce:Ti molar mass ratio is 1:0.8.

[0036] ②The first step of mixing: 450g of composite oxide carrier powder CeO 2 -TiO 2 1. Add 60g of deionized water into the mixer and mix and stir;

[0037] The second step of mixing: after the first step of mixing is completed, 20g of pseudo-boehmite and 10g of deionized wa...

Embodiment 2

[0043] (1) ① measure 12.61g of cerium nitrate, slowly drop into 150g of deionized water; measure 5.92g of tetra-n-butyl titanate, slowly drop into the above-mentioned aqueous solution containing cerium nitrate; stir vigorously Under certain conditions, ammonia water was slowly added dropwise until the pH value reached about 9, and the hydroxide precipitate was obtained and allowed to stand for 15 hours; the above mixture was filtered, washed, and washed with AgNO 3 The solution was detected to have no precipitation; then placed in an ordinary blast drying oven at 110°C for 15 hours, and in a muffle furnace at 550°C for 2 hours to obtain nano-CeO 2 -TiO 2 Composite oxide powder, wherein the Ce:Ti molar mass ratio is 1:0.6.

[0044] ②The first step of mixing: 450g of composite oxide carrier powder CeO 2 -TiO 2 , 70g of deionized water is added to the mixer for mixing and stirring;

[0045] The second step of mixing: after the first mixing is completed, 20g of pseudo-boehmite...

Embodiment 3

[0051] (1) 1. measure the cerium nitrate of 16.24g, slowly drop into the deionized water of 180g; Measure the zirconium oxychloride of 9.64g in addition, slowly drop into the above-mentioned aqueous solution containing cerium nitrate; Slowly add ammonia water dropwise until the pH value reaches about 9, get hydroxide precipitate and let it stand for 16h; filter the above mixture, wash it, and use AgNO 3 The solution was detected to have no precipitation; then it was dried in an ordinary blast drying oven at 90°C for 15h, and baked in a muffle furnace at 550°C for 2h to obtain nano-CeO 2 -ZrO 2 Composite oxide powder, wherein the Ce:Zr molar mass ratio is 1:0.8.

[0052] ②The first step of mixing: 450g of composite oxide carrier powder CeO 2 -ZrO 2 1. Add 60g of deionized water into the mixer and mix and stir;

[0053] The second step of mixing: after the first step of mixing is completed, 25g of pseudo-boehmite and 15g of deionized water are added to the mixture for mixing...

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Abstract

The invention belongs to the field of environmental protection and environmental catalysis and particularly relates to a flat-plate type high-temperature SCR (Selective Catalytic Reduction) denitration catalyst and a preparation method thereof. The preparation method comprises the following steps of: by adopting a nano composite oxide CeO2-TiO2 or CeO2-ZrO2 as a carrier, and adopting WO3 as an active component, carrying out stepped mixing, rolling coating, pleating, shearing, drying and roasting to obtain the flat-plate type high-temperature SCR denitration catalyst on the basis of adopting CeO2-TiO2 or CeO2-ZrO2 composite oxide as the carrier. The product has excellent high-temperature denitration performance, and is applicable to flue-gas denitration under the temperature of 500-700 DEG C; and the product has excellent mechanical performance, sulfur-dioxide poisoning resistance and sintering resistance.

Description

technical field [0001] The invention belongs to the field of environmental protection and environmental catalysis, and in particular relates to a flat-plate high-temperature SCR denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are the main air pollutants, which can cause acid rain, photochemical smog, greenhouse effect and the destruction of the ozone layer, and also have serious harm to human health. About 63% of NOx in nature comes from industrial pollution and traffic pollution, which is twice that of natural sources; therefore, how to effectively control NOx emissions from coal-fired power plants and other industries has attracted people's attention. [0003] In recent years, the requirements for NOx emissions in various countries have become increasingly stringent. Among various denitrification technologies, the ammonia selective catalytic reduction (SCR) method is currently the main flue gas denitrification effi...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J35/02B01D53/86B01D53/56
Inventor 张景文
Owner 北京华电光大环境股份有限公司
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