Flat-plate wide-temperature sulfur-resistant alkali-metal-resistant SCR denitrification catalyst and production method thereof

A denitration catalyst, flat-plate technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst carriers, chemical instruments and methods, etc., can solve the problems of easy sulfur poisoning, narrow active temperature range, alkali metal poisoning, etc. , to avoid deactivation, increase specific surface area, and achieve the effect of excellent wide temperature activity

Active Publication Date: 2020-02-18
北京华电光大环境股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing SCR denitrification catalyst has a narrow active temperature range, and is prone to sulfur poisoning and alkali metal poisoning in flue gas containing water, sulfur, and alkali metals. Alkali metal SCR denitrification catalyst and preparation method thereof, having wider active temperature range and significantly improving its anti-sulfur and anti-alkali metal poisoning performance

Method used

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  • Flat-plate wide-temperature sulfur-resistant alkali-metal-resistant SCR denitrification catalyst and production method thereof
  • Flat-plate wide-temperature sulfur-resistant alkali-metal-resistant SCR denitrification catalyst and production method thereof
  • Flat-plate wide-temperature sulfur-resistant alkali-metal-resistant SCR denitrification catalyst and production method thereof

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preparation example Construction

[0035] The preparation method of the flat-plate wide-temperature anti-sulfur and anti-alkali metal SCR denitrification catalyst provided by the invention, such as figure 1 shown, including the following steps:

[0036] S1. Catalyst carrier preparation:

[0037] Under stirring conditions, add cerium nitrate and zirconium oxychloride powder into concentrated ammonia water in turn, then slowly add ascorbic acid and sodium citrate and stir well, then slowly add tetrabutyl titanate ethanol solution, stir well and then add Sodium hydroxide solution, react under hydrothermal conditions at 160-200°C for 24-48 hours; wash the obtained precipitate with dilute nitric acid, water and absolute ethanol, dry it in the air at 120-160°C for 12-24 hours, and then dry it in the air Calcination at 450-550°C for 2-8 hours to obtain titanium-cerium-zirconium composite nanotubes as catalyst supports;

[0038] S2. Catalyst sludge preparation:

[0039] S2.1. respectively configure ammonium heptamol...

Embodiment 1

[0050] In this example, the preparation process of the flat-plate wide-temperature anti-sulfur and anti-alkali metal SCR denitration catalyst is as follows:

[0051] (1) Under stirring conditions, add 1181g of cerium nitrate and 869g of zirconium oxychloride powder into 20L of concentrated ammonia water in sequence, then slowly add 2040g of ascorbic acid and 4080g of sodium citrate and stir evenly, then slowly add 40L containing 1852g of tetrabutyl titanate After stirring the ethanol solution of the ester, add 150L 5mol / L sodium hydroxide solution, and react for 48h under the hydrothermal condition of 160°C; ℃ drying for 24 hours, and finally calcination in air at 450 ℃ for 8 hours to obtain titanium cerium zirconium composite nanotubes.

[0052] (2) Dissolve 183g ammonium heptamolybdate, 76g ferric nitrate and 8g samarium sulfate in 500ml, 300ml and 400ml water respectively, then add ammonium heptamolybdate solution and ferric nitrate solution to the prepared titanium cerium ...

Embodiment 2

[0057] In this example, the preparation process of the flat-plate wide-temperature anti-sulfur and anti-alkali metal SCR denitration catalyst is as follows:

[0058] (1) Under stirring conditions, add 1181g of cerium nitrate and 869g of zirconium oxychloride powder into 20L of concentrated ammonia water in sequence, then slowly add 2040g of ascorbic acid and 4080g of sodium citrate and stir evenly, then slowly add 40L containing 1852g of tetrabutyl titanate After stirring the ethanol solution of the ester, add 150L of 5mol / L sodium hydroxide solution, and react for 24h under the hydrothermal condition of 200℃; ℃ drying for 12 hours, and finally calcination in air at 550 ℃ for 2 hours to obtain titanium cerium zirconium composite nanotubes.

[0059] (2) Dissolve 119g ammonium heptamolybdate, 152g ferric nitrate and 30g samarium sulfate in 300ml, 400ml and 500ml water respectively, then add ammonium heptamolybdate solution and ferric nitrate solution to the prepared titanium cer...

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Abstract

The invention belongs to the technical fields of environmental protection and denitrification catalysis, and particularly relates to a flat-plate wide-temperature sulfur-resistant alkali-metal-resistant SCR denitrification catalyst and a production method thereof. A carrier of the catalyst is titanium-cerium-zirconium compound nanotubes, an active component of the catalyst is vanadium pentoxide, and catalytic additives are ferric oxide, molybdenum trioxide and samarium sulphate. A two-step roll forming technology is adopted, and comprises the steps of firstly, loading the catalytic additives onto surfaces of the titanium-cerium-zirconium compound nanotubes by adopting an incipient-wetness impregnation method, then loading the active component of the catalyst onto surfaces of the carrier, and forming the catalyst into a flat plate through the roll forming technology to produce the flat-plate SCR denitrification catalyst with wide-temperature activity and performance of resistance to sulfur poisoning and alkali metal poisoning. The catalyst has excellent catalytic activity and performance of resistance to sulfur poisoning and alkali metal poisoning at a range of 150-450 DEG C, the problems of a narrow activity temperature range, sulfur poisoning, alkali metal poisoning and the like of a conventional catalyst in sulfur-containing alkali-metal-containing flue gas can be solved, andthe flat-plate wide-temperature sulfur-resistant alkali-metal-resistant SCR denitrification catalyst is suitable for wide-temperature denitrification of sulfur-containing alkali-metal-containing complex flue gas.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and denitrification catalysis, and in particular relates to a flat-plate wide-temperature, sulfur-resistant and alkali-resistant metal SCR denitrification catalyst. The invention also provides a preparation method of the flat-plate wide-temperature anti-sulfur and anti-alkali metal SCR denitrification catalyst. Background technique [0002] Selective Catalytic Reduction (SCR, Selective Catalytic Reduction) is currently the most widely used stationary source flue gas denitrification technology, which has the advantages of high denitrification efficiency, good nitrogen selectivity, and stable operation. SCR denitrification is under the action of a catalyst, using ammonia gas as a reducing agent to reduce the NO x Selectively reduced to harmless nitrogen and water. [0003] At present, the most widely used SCR flue gas denitrification catalyst is V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01J23/10B01J35/02B01J35/08B01J32/00B01D53/86B01D53/56
CPCB01J27/053B01J23/10B01J35/023B01J35/08B01D53/8628B01D2258/0283B01D2251/2062
Inventor 曲艳超陈晨
Owner 北京华电光大环境股份有限公司
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