Wide window denitration non-vanadium rare earth based catalyst and preparation method thereof

A rare earth-based catalyst technology, applied in the field of denitration catalysts, can solve the problems of catalyst performance decline, catalytic performance decline, etc., and achieve the effects of improving denitration performance, broadening the upper temperature limit, and improving catalyst effect.

Inactive Publication Date: 2019-07-12
山东东源新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a wide-window (220°C-580°C) SCR denitrification catalyst with good denitrification efficiency and its preparation method. The catalyst is mainly composed of CeO 2 -WO 3 -TiO 2 A certain amount of chitosan, La 2 o 3 Modified with CuO, found the use of chitosan, La 2 o 3 and CuO with CeO 2 The synergistic effect between them solves the problem that the catalytic performance of vanadium-free rare earth-based catalysts decreases seriously at low temperatures and the catalyst performance decreases at high temperatures

Method used

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  • Wide window denitration non-vanadium rare earth based catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Inject 100 parts by mass of deionized water into the reaction kettle, start stirring, and control the temperature. After the water temperature reaches 65°C, add 0.3g of ammonia water and stir evenly; at this temperature, add 0.8g of citric acid, 10g Stir chitosan evenly; then add 3g ammonium metatungstate, 9g cerium oxalate, 3g lanthanum oxalate, 0.3g copper chloride, and stir evenly; then add 0.3g sodium dodecylsulfonate, 60g titanium dioxide, and stir evenly; Then add 8g of clay and stir evenly; then add 30g of titanium dioxide and stir evenly to obtain a well-stirred slurry;

[0023] Natural aging in the reactor for 3 hours;

[0024] The aged slurry is continuously heated and stirred in the evaporation pool to evaporate the liquid until the slurry is agglomerated and the surface is cracked to obtain dry agglomerated slurry;

[0025] Put the above-mentioned agglomerated slurry into a muffle furnace, raise the temperature to 120°C at room temperature, and keep it for ...

Embodiment 2

[0027] Inject 100 parts by mass of deionized water into the reaction kettle, start stirring, and control the temperature. After the water temperature reaches 65°C, add 0.3g of ammonia water and stir evenly; at this temperature, add 0.8g of citric acid, 20g Stir chitosan evenly; then add 3g ammonium metatungstate, 9g cerium oxalate, 2g lanthanum oxalate, 0.1g copper chloride, and stir evenly; then add 0.3g sodium dodecylsulfonate, 60g titanium dioxide, and stir evenly; Then add 8g of clay and stir evenly; then add 30g of titanium dioxide and stir evenly to obtain a well-stirred slurry;

[0028] Other steps are identical with embodiment 1.

Embodiment 3

[0030] Inject 100 parts by mass of deionized water into the reaction kettle, start stirring, and control the temperature. After the water temperature reaches 65°C, add 0.3g of ammonia water and stir evenly; at this temperature, add 0.8g of citric acid, 10g Stir chitosan evenly; then add 3g ammonium metatungstate, 9g cerium oxalate, 4g lanthanum oxalate, 0.5g copper chloride, and stir evenly; then add 0.3g sodium dodecylsulfonate, 60g titanium dioxide, and stir evenly; Then add 8g of clay and stir evenly; then add 30g of titanium dioxide and stir evenly to obtain a well-stirred slurry;

[0031] Other steps are identical with embodiment 1.

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Abstract

The invention provides a wide window denitration non-vanadium rare earth based catalyst and a preparation method thereof. The catalyst has the advantages that chitosan, La2O3 and CuO are introduced toperform joint modification on the basis of a CeO2-WO3-TiO2 catalyst, the fact that the adoption of chitosan and the synergistic effect among the La2O3, CuO and Ce oxide improve the activity of the catalyst at low temperature, medium temperature and high temperature and widen the application temperature range of the catalyst is found. Through the introduction of viscosity replacement part TiO2, the activity of the catalyst in a high-temperature section is further improved, and the upper limit temperature of the activity window of the catalyst is widened.

Description

technical field [0001] The invention relates to a denitration catalyst, in particular to a wide-window denitration vanadium-free rare earth-based catalyst and a preparation method thereof. Background technique [0002] There are a large number of industrial combustion boilers in my country, including about 540,000 industrial boilers and nearly 200,000 industrial kilns (sintering machines, cement rotary kilns, etc., glass kilns), biomass boilers, waste incineration boilers, fluidized bed furnaces, and their NO x Emissions account for about NO x 30% of total emissions. Due to different types of combustion boilers, large changes in working conditions and frequent load adjustments, the flue gas temperature of the flue gas is between 200 and 600 °C. Currently, NH for industrial applications 3 -SCR catalyst, mainly V 2 o 5 -TiO 2 or V 2 o 5 -WO 3 (MoO 3 )-TiO 2 , its activity window is 300-420°C, so it often happens that the flue gas temperature exceeds the effective ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/888B01J2523/00B01J2523/17B01J2523/3706B01J2523/3712B01J2523/47B01J2523/69
Inventor 王娜叶长飞葛成敏
Owner 山东东源新材料科技有限公司
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