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Medium and low temperature denitration catalyst with protective layer and preparation method thereof

A low-temperature denitrification technology with a protective layer, which is applied in the field of air pollution control technology and environmental catalytic materials, can solve the problems of poisoning and service life, and achieve the effects of prolonging service life, improving denitrification efficiency, and strong sulfur resistance

Active Publication Date: 2016-04-06
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a medium-low temperature denitrification catalyst with a protective layer and a preparation method thereof, which solves the problems of existing low-temperature SCR catalysts being poisoned in water-containing sulfur-containing flue gas and having a short service life

Method used

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  • Medium and low temperature denitration catalyst with protective layer and preparation method thereof
  • Medium and low temperature denitration catalyst with protective layer and preparation method thereof
  • Medium and low temperature denitration catalyst with protective layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 30 ml of water and 30 ml of absolute ethanol, mix well and add 0.96 ml of silane coupling agent, then add 4.8 g of titanium nanotubes and 12 g of titanium dioxide particles, then vigorously stir at 70°C for 5 hours, then wash with ethanol twice, The carrier precipitate was obtained after filtration. Take 0.1347 g of ammonium metavanadate, 1 g of cerium nitrate hexahydrate, and 0.0556 g of copper nitrate trihydrate, dissolve them in deionized water at 60°C, add the carrier to precipitate under vigorous stirring, and continue stirring for 4 hours to obtain the outer layer Protective film slurry.

[0037] Take 24.8157 grams of ammonium metavanadate, 121.7585 grams of cerium nitrate hexahydrate, and 0.0008 grams of silver nitrate, dissolve them in deionized water at 60°C, add 3378.264 grams of titanium dioxide particles under strong stirring, continue stirring for 4 hours, and then dry them at 60°C , Calcined at 350°C for 3 hours, and finally ground to obtain the main...

Embodiment 2

[0041] Take 30 ml of water and 30 ml of absolute ethanol, mix them evenly, add 4.46 ml of silane coupling agent, add 5.575 g of titanium nanotubes, 3.98 g of titanium dioxide particles, stir vigorously at 90°C for 12 hours, wash twice with ethanol, and filter to obtain Carrier precipitation. Take 0.3233 g of ammonium metavanadate, 1 g of cerium nitrate hexahydrate, and 0.5564 g of copper nitrate trihydrate, dissolve them in deionized water at 90°C, add the carrier to precipitate under vigorous stirring, and continue stirring for 8 hours to obtain the outer layer Protective film slurry.

[0042] Take 2.77 grams of ammonium metavanadate, 4.95 grams of cerium nitrate hexahydrate, and 0.0031 grams of silver nitrate, dissolve them in deionized water at 80°C, add 37.43 grams of titanium dioxide particles under strong stirring, continue stirring for 8 hours, and then dry them at 80°C , calcined at 450° C. for 5 hours, and finally ground to obtain the main body powder of the inner la...

Embodiment 3

[0045] Take 30 ml of water and 30 ml of absolute ethanol, mix well, add 2.57 ml of silane coupling agent, then add 5.14 g of titanium nanotubes and 5.14 g of titanium dioxide particles, then stir vigorously at 80°C for 24 hours, then wash with ethanol for 3 times, filter Afterwards, the carrier was precipitated. Take 0.2155 g of ammonium metavanadate, 1 g of cerium nitrate hexahydrate, and 0.2782 g of copper nitrate trihydrate, dissolve them in deionized water at 80°C, add the carrier to precipitate under vigorous stirring, and continue stirring for 18 hours to obtain the outer layer Protective film slurry.

[0046] Take 3.18 grams of ammonium metavanadate, 7.8 grams of cerium nitrate hexahydrate, and 0.0035 grams of chloroplatinic acid, dissolve them in deionized water at 90°C, add 92.78 grams of titanium dioxide particles under strong stirring, continue stirring for 12 hours, and then bake at 120°C dry, calcined at 600°C for 12 hours, and finally ground to obtain the main b...

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Abstract

The invention discloses a medium and low temperature denitration catalyst with a protective layer and a preparation method thereof. The catalyst is composed of an outer layer protective film and an inner layer catalyst body; the outer layer protective film takes a mixture of titanium dioxide nanoparticles and titanium nanotubes as a substrate material, and V, Ce and Cu composite oxide is doped; the inner layer catalyst body takes the titanium dioxide nanoparticles as carriers, takes V and Ce composite oxide as a main active component and takes trace precious metal as an additive. The catalyst is provided with the protective film with a special structure, the protective film has good medium and low temperature denitration activity by itself, sulfur ammonium salt particles can not enter pore passages of the titanium nanotubes, reaction gas can reach the inner layer catalyst body through the pore passages of the titanium nanotubes, the catalyst shows excellent water-resistant and sulfur-resistant properties, and the service life is effectively prolonged.

Description

technical field [0001] The invention relates to the fields of air pollution control technology and environmental catalytic materials, in particular to a low-temperature denitrification catalyst for fixed source nitrogen oxide treatment and a preparation method thereof. Background technique [0002] Stationary emission sources of nitrogen oxides include power plant boilers, industrial boilers, steel sintering kilns, glass furnaces and cement furnaces, etc. Selective catalytic reduction (SCR) denitrification technology is the flue gas denitrification technology with the widest application, the highest market share and the most stable and reliable operation in the world. [0003] At present, most SCR denitrification devices use V 2 o 5 -WO 3 / TiO 2 or V 2 o 5 -MoO 3 / TiO 2 Catalyst, this type of vanadium-based catalyst has the advantages of high activity and good selectivity, but the activity temperature window is narrow, and the flue gas temperature is generally requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/84B01J35/02B01D53/56B01D53/86B01J35/00
CPCB01D53/8628B01J21/063B01J23/002B01J23/84B01D2255/40B01D2255/20761B01D2255/20723B01D2255/2065B01D2255/9022B01D2257/40B01J2523/00B01J35/00B01J35/30B01J2523/17B01J2523/3712B01J2523/55B01J2523/47
Inventor 王岳军吴忠标莫建松刘伟戴仙兵
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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