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Nitrogen oxide removal catalyst and preparation method thereof

A technology of nitrogen oxides and catalysts, which is applied in the field of nitrogen oxides removal catalysts, can solve the problems of poor low-temperature activity and easy sulfur poisoning, and achieve the effects of reducing adsorption, reducing the formation of ammonium sulfate salts, and promoting decomposition

Active Publication Date: 2020-12-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve technical problems such as poor low-temperature activity and easy sulfur poisoning of existing SCR denitrification catalysts, and provides a nitrogen oxide removal catalyst based on cobalt, lanthanum and niobium oxide nanocages and a preparation method thereof. Excellent denitrification activity and anti-sulfur poisoning performance in flue gas at 100-140°C

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  • Nitrogen oxide removal catalyst and preparation method thereof

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preparation example Construction

[0031]In order to better realize the above technical solution, the present invention also provides a method for preparing the nitrogen oxide removal catalyst based on cobalt, lanthanum and niobium oxide nanocages, comprising the following steps:

[0032] Step S1. Preparation of cobalt, lanthanum and niobium oxide nanocages, including:

[0033] Step S11. Prepare methanol solutions of cobalt nitrate and 2-methylimidazole respectively, add the 2-methylimidazole solution into the methanol solution of cobalt nitrate under vigorous stirring, stir well and let stand at room temperature for 24-48h, separate, Wash with ethanol and dry at 50-80°C for 2-4 hours to obtain a solid, and then disperse the solid in the ethanol solution;

[0034] Step S12. Add lanthanum acetate and niobium acetate to the mixed solution of ethanol and water, then add the mixed solution of lanthanum acetate and niobium acetate to the solution in step S11 under stirring, and let stand at room temperature after fu...

Embodiment 1

[0047] A nitrogen oxide removal catalyst based on cobalt, lanthanum and niobium oxide nanocages and a preparation method thereof. The specific steps of the preparation method include:

[0048] (1) Preparation of cobalt, lanthanum and niobium oxide nanocages

[0049] Weigh 193.26g of cobalt nitrate hexahydrate and 54.51g of 2-methylimidazole and dissolve them in 1.328L and 166mL of methanol respectively, add the 2-methylimidazole solution into the methanol solution of cobalt nitrate under vigorous stirring, and stir at room temperature Stand still for 24 hours, separate, wash with ethanol, and dry at 50°C for 2 hours to obtain a solid, and then disperse the solid in the ethanol solution;

[0050] Add 104.93g of lanthanum acetate and 128.82g of niobium acetate into a mixed solution of 664mL of ethanol and water, then add the mixed solution of lanthanum acetate and niobium acetate into the cobalt solution under stirring, and let it stand at room temperature for 24 hours after ful...

Embodiment 2

[0057] Another nitrogen oxide removal catalyst based on cobalt, lanthanum and niobium oxide nanocages and a preparation method thereof. The specific steps of the preparation method include:

[0058] (1) Preparation of cobalt, lanthanum and niobium oxide nanocages

[0059] Weigh 115.26g of cobalt nitrate hexahydrate and 32.51g of 2-methylimidazole and dissolve them in 792mL and 99mL of methanol respectively, add the 2-methylimidazole solution into the methanol solution of cobalt nitrate under vigorous stirring, and after stirring fully Stand still for 48 hours, separate, wash with ethanol, and dry at 80°C for 4 hours to obtain a solid, and then disperse the solid in an ethanol solution;

[0060] Add 125.15g of lanthanum acetate and 153.65g of niobium acetate into a mixed solution of 396mL of ethanol and water, then add the mixed solution of lanthanum acetate and niobium acetate into the cobalt solution under stirring, and let it stand at room temperature for 48h after fully sti...

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Abstract

The invention provides a nitrogen oxide removal catalyst based on a cobalt-lanthanum-niobium oxide nanocage. A catalyst carrier is flaky nano titanium dioxide, an active component is a cobalt-lanthanum-niobium hollow porous nano cage, and the final catalyst is prepared through prevulcanization treatment before the catalyst is used. The hollow nanocage of the cobalt-lanthanum-niobium composite oxide as an active component has good low-temperature catalytic activity, and the flaky nano titanium dioxide preferentially exposes (001) a high-activity crystal face, so that the activity of the catalyst is further improved; and the sulfur poisoning resistance of the catalyst can be remarkably improved after the catalyst is subjected to pre-vulcanization treatment. The catalyst provided by the invention has good denitration activity and sulfur poisoning resistance in a temperature range of 100-140 DEG C.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and denitrification catalysis, and in particular relates to a nitrogen oxide removal catalyst based on cobalt, lanthanum and niobium oxide nanocages, which can realize the removal of nitrogen oxides. The invention also provides a preparation method of the nitrogen oxide removal catalyst based on the cobalt-lanthanum-niobium oxide nanocage. Background technique [0002] Nitrogen oxides (NO x ) is an important air pollutant and one of the main components of smog, causing serious harm to the environment and human health. Among many nitrogen oxide control technologies, Selective Catalytic Reduction (SCR) is currently the most widely used, highest denitrification efficiency, and most mature and stable denitrification technology. The key to SCR denitrification technology is the catalyst. At present, commercial SCR denitrification catalysts are based on V 2 o 5 is the active ingredie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/847B01J35/02B01J37/02B01J37/20B01D53/86B01D53/56B01J35/00
CPCB01J37/20B01J23/002B01J23/8474B01J37/0201B01J21/063B01D53/8628B01J2523/00B01J35/50B01J2523/3706B01J2523/56B01J2523/845Y02C20/30
Inventor 陆强曲艳超陈晨吴洋文刘吉赵莉
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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