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Scr flue gas denitrification catalyst based on tio2-zro2 composite carrier and preparation method

A technology of denitration catalyst and composite carrier, applied in the field of SCR flue gas denitration catalyst, can solve the problem of narrow catalytic activity temperature range, etc., and achieve the effects of many acid sites, high thermal stability, and improved service life

Active Publication Date: 2011-12-07
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, the catalytic activity temperature range of this commercial denitration catalyst is relatively narrow, usually 300-400°C, and the catalytic activity needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Composite carrier preparation: measure titanium tetrachloride and tin tetrachloride with a mass ratio of 5:4, specifically measure 9.96 g of titanium tetrachloride, and slowly drop them into 60 mL of absolute ethanol solution; In addition, measure 7.94g of zirconium tetrachloride and slowly drop it into the above-mentioned absolute ethanol solution containing titanium tetrachloride; under the condition of vigorous stirring, slowly add ammonia water dropwise until the pH value reaches about 9 to obtain the hydroxide Precipitate and stand for 24h; filter and wash the above mixture (with AgNO 3 Detection without Cl - ), and then placed in an ordinary blast drying oven at 110 ° C for 3 h, and then baked at 500 ° C in a muffle furnace (programmed temperature rise rate of 2 ° C / min, holding time of 3 h), that is, nano-TiO 2 -ZrO 2 Composite metal oxides, among them, TiO 2 / TiO 2 -ZrO 2 = 50%.

[0026] (2) Measure cerium nitrate, ammonium metavanadate and ammonium ...

Embodiment 2

[0029] (1) Composite carrier preparation: measure titanium tetrachloride and tin tetrachloride with a mass ratio of 5:4, the specific operation is: measure 10.67g of titanium tetrachloride, slowly drop into 65mL of absolute ethanol solution In addition, measure 8.51g of zirconium tetrachloride and slowly drop it into the above-mentioned absolute ethanol solution containing titanium tetrachloride; under the condition of vigorous stirring, slowly add ammonia water until the pH value reaches about 9 to obtain hydrogen The oxide precipitated and stood for 24h; the above mixture was filtered and washed (with AgNO 3 Detection without Cl - ), and then placed in an ordinary blast drying oven at 110 ° C for 3 h, and then baked at 500 ° C in a muffle furnace (programmed temperature rise rate of 2 ° C / min, holding time of 3 h), that is, nano-TiO 2 -ZrO 2 composite metal oxide, and TiO 2 / TiO 2 -ZrO 2 = 50%.

[0030] (2) Measure cerium nitrate, ammonium metavanadate and ammonium t...

Embodiment 3

[0033] (1) Composite carrier preparation: measure titanium tetrachloride and tin tetrachloride with a mass ratio of 3.76:1, the specific operation is: measure 15.97g of titanium tetrachloride, slowly drop into 98.9mL of absolute ethanol solution; in addition, measure 4.25g of zirconium tetrachloride, and slowly drop it into the above-mentioned dehydrated ethanol solution containing titanium tetrachloride; under the condition of vigorous stirring, slowly add ammonia water dropwise until the pH value reaches about 9, and obtain The hydroxide precipitated and stood for 24h; the above mixture was filtered and washed (with AgNO 3 Detection without Cl - ), and then placed in an ordinary blast drying oven at 110 ° C for 3 h, and then roasted at 550 ° C in a muffle furnace (programmed temperature rise rate of 2 ° C / min, holding time of 3 h), that is, to obtain nano-TiO 2 -ZrO 2 composite metal oxide, and TiO 2 / TiO 2 -ZrO 2 = 75%.

[0034] (2) Measure cerium nitrate, ammonium ...

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Abstract

The invention mainly relates to a SCR (selective catalyctic reduction) flue gas denitration catalyst based on a TiO2-ZrO2 composite metal oxide carrier, belonging to the field of environment protection and environment catalysis. According to the invention, with the nanometer TiO2-ZrO2 as a carrier, WO3 and CeO2 as assistants and V2O5 as an active component, a low-and-medium temperature flue gas denitration catalyst based on the TiO2-ZrO2 composite carrier is obtained. The nanometer TiO2-ZrO2 substitutes the traditional nanometer TiO2 and is used as a carrier, thus the specific area, the heat stability and the acidity of the catalyst are improved; and denitration activity of the catalyst is improved through mutual action among V2O5, WO3 and CeO2; when the ammonia is used as a reducing agent, the catalyst can show very good catalyzing activity at150-450 DEG C.

Description

technical field [0001] The invention belongs to the field of environmental protection and environmental catalysis, in particular to a novel TiO-based 2 -ZrO 2 SCR flue gas denitrification catalyst based on composite metal oxide carrier. 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. 63% of NOx in nature comes from industrial pollution and traffic pollution, which is twice that of natural sources, of which 40% is from the power industry. Therefore, how to effectively control NOx emissions from coal-fired power plants has attracted much attention. NOx pollution is a global environmental problem. In recent years, the requirements for NOx emissions in various countries have become increasingly stringent. Among various denitrification technologies, ammonia selective catalytic reduction (SCR) metho...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J21/06B01J32/00B01D53/56B01D53/90
Inventor 张俊姣陆强苏淑华杨勇平董长青
Owner 北京华电光大环境股份有限公司
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