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Scr flue gas denitrification catalyst based on tio2-sno2 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 effect of many acidic sites, high thermal stability, and promoting denitration reaction.

Inactive Publication Date: 2015-10-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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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 15:11, specifically measure 9.96 g of titanium tetrachloride, and slowly drop them into 60 mL of absolute ethanol solution; In addition, measure 7.26g of tin 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 9.5 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 -SnO 2 Composite metal oxides, among them, TiO 2 / TiO 2 -SnO 2 = 50%.

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

Embodiment 2

[0029] (1) Composite carrier preparation: measure titanium tetrachloride and tin tetrachloride with a mass ratio of 7.79:1, the specific operation is: measure 18.14g of titanium tetrachloride, slowly drop into 110.5mL of absolute ethanol In the solution; In addition, measure 2.33g of tin 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 until the pH value reaches about 9.5, 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 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 -SnO 2 composite metal oxide, and TiO 2 / TiO 2 -SnO 2 = 85%.

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

Embodiment 3

[0033] (1) Composite carrier preparation: measure titanium tetrachloride and tin tetrachloride with a mass ratio of 26:1, the specific operation is: measure 20.05g of titanium tetrachloride, slowly drop into 127mL of absolute ethanol solution In addition, measure 0.77g of tin 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 9.5 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 -SnO 2 composite metal oxide, and TiO 2 / TiO 2 -SnO 2 = 95%.

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

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PUM

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Abstract

The invention belongs to the field of environment friendliness and environment catalysis, in particular relates to an SCR (Selective Catalyctic Reduction) smoke denitration catalyst based on a TiO2-SnO2 composite barrier. The medium-low temperature smoke denitration catalyst based on the TiO2-SnO2 composite barrier is prepared by using nanometer TiO2-SnO2 as a carrier, WO3 and CeO2 as additives and V2O5 as an active component. By adopting the nanometer TiO2-SnO2 for replacing the traditional nanometer TiO2 as the carrier, the specific surface area, the thermal stability and the acidity of the catalyst are increased, the denitration activity of the catalyst is improved through interaction among the V2O5, the WO3 and the CeO2; and when ammonia is used as a reducing agent, better catalytic activity is expressed within a temperature range of 150-450 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 -SnO 2 SCR flue gas denitrification catalyst based on composite metal oxide carrier. Background technique [0002] Nitrogen oxides in the air pollutants are easy to form acid rain and photochemical smog in the atmosphere, destroy the ozone layer and cause the greenhouse effect, which has brought serious harm to the natural environment and human health. 63% of NOx in nature comes from industrial pollution and traffic pollution, twice that of natural sources, of which 40% is from the power industry. According to statistics, about 60% of NOx in my country's air pollutants comes from coal combustion, so controlling the emission of nitrogen oxides from coal-fired boilers is a grim situation and an urgent task. Among various denitrification technologies, ammonia selective catalytic reduction (SCR) method is currently the main de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J32/00B01D53/90B01D53/56
Inventor 董长青陆强苏淑华杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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