Plate type wide temperature anti-sulfur and anti-alkali metal SCR denitration catalyst and preparation 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, alkali metal poisoning, and narrow active temperature range. , to increase the specific surface area, improve the anti-sulfur poisoning performance, and improve the low-temperature denitration activity.

Active Publication Date: 2022-07-15
北京华电光大环境股份有限公司
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  • Description
  • Claims
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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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  • Plate type wide temperature anti-sulfur and anti-alkali metal SCR denitration catalyst and preparation method thereof
  • Plate type wide temperature anti-sulfur and anti-alkali metal SCR denitration catalyst and preparation method thereof
  • Plate type wide temperature anti-sulfur and anti-alkali metal SCR denitration catalyst and preparation method thereof

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preparation example Construction

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

[0036] S1. Preparation of catalyst carrier:

[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 evenly, then slowly add ethanol solution of tetrabutyl titanate, stir evenly, and then add Sodium hydroxide solution, react under hydrothermal conditions at 160~200℃ for 24~48h; after washing the obtained precipitate with dilute nitric acid, water and absolute ethanol, dry it in air at 120~160℃ for 12-24h, and then in air calcining at 450-550 ℃ for 2-8 hours to obtain titanium-cerium-zirconium composite nanotubes as catalyst carriers;

[0038] S2. Catalyst mud preparation:

[0039] S2.1. respectively configure ammonium heptamolybdate and ...

Embodiment 1

[0050] The preparation process of the flat plate type wide temperature anti-sulfur and anti-alkali metal SCR denitration catalyst of the present embodiment 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 turn, then slowly add 2040g of ascorbic acid and 4080g of sodium citrate and stir evenly, then slowly add 40L of tetrabutyl titanate containing 1852g The ethanol solution of the ester was stirred evenly, and then 150L of 5mol / L sodium hydroxide solution was added, and the reaction was carried out under the hydrothermal condition of 160℃ for 48h; After drying at ℃ for 24 h, and finally calcining at 450 ℃ for 8 h in air, titanium-cerium-zirconium composite nanotubes can be obtained.

[0052] (2) 183g of ammonium heptamolybdate, 76g of ferric nitrate and 8g of samarium sulfate were dissolved in 500ml, 300ml and 400ml of water respectively, and then the ammonium he...

Embodiment 2

[0057] The preparation process of the flat plate type wide temperature anti-sulfur and anti-alkali metal SCR denitration catalyst of the present embodiment 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 turn, then slowly add 2040g of ascorbic acid and 4080g of sodium citrate and stir evenly, then slowly add 40L of tetrabutyl titanate containing 1852g The ethanol solution of the ester was stirred evenly, and then 150L of 5mol / L sodium hydroxide solution was added, and the reaction was carried out under the hydrothermal condition of 200℃ for 24h; After drying at ℃ for 12 h, and finally calcining at 550 ℃ for 2 h in air, titanium-cerium-zirconium composite nanotubes can be obtained.

[0059] (2) 119g of ammonium heptamolybdate, 152g of ferric nitrate and 30g of samarium sulfate were dissolved in 300ml, 400ml and 500ml of water respectively, and then the ammonium ...

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Abstract

The invention belongs to the technical field of environmental protection and denitration catalysis, and in particular relates to a flat plate type wide temperature, sulfur and alkali metal SCR denitration catalyst and a preparation method thereof. The carrier of the catalyst is a titanium-cerium-zirconium composite nanotube, the active component of the catalyst is vanadium pentoxide, and the catalyst assistants are ferric oxide, molybdenum trioxide and samarium sulfate; a two-step roll forming process is adopted: The catalyst promoter is loaded on the surface of the titanium-cerium-zirconium composite nanotubes by the equal volume impregnation method, and the active components of the catalyst are loaded on the surface of the carrier. Plate SCR denitration catalyst with metal poisoning performance. The catalyst of the present invention has good catalytic activity and anti-sulfur and anti-alkali metal poisoning performance in the range of 150-450 ° C, and can solve the problem that the conventional catalyst has a narrow active temperature range, sulfur poisoning and alkali metal poisoning in the flue gas containing sulfur and alkali metal. Metal poisoning and other problems, suitable for wide temperature sulfur-containing alkali metal complex flue gas denitrification.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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