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Plate type wide temperature anti-sulfur SCR denitration catalyst and preparation method thereof

A denitrification catalyst, flat-plate technology, applied in the direction of catalyst carrier, chemical instrument and method, physical/chemical process catalyst, etc., can solve the problem of easy sulfur poisoning deactivation active temperature zone, etc., to reduce SO2 oxidation rate and optimize the preparation process , the effect of good economic benefits

Active Publication Date: 2022-07-15
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 present invention aims to solve the problem that the existing SCR denitrification catalyst is easily deactivated by sulfur poisoning in the water-containing sulfur-containing flue gas and its active temperature range is narrow. It provides a flat-plate wide-temperature sulfur-resistant SCR denitration catalyst and its preparation method. It has a wider active temperature zone, significantly improves the anti-sulfur poisoning performance, and has good economic benefits

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  • Plate type wide temperature anti-sulfur SCR denitration catalyst and preparation method thereof
  • Plate type wide temperature anti-sulfur SCR denitration catalyst and preparation method thereof
  • Plate type wide temperature anti-sulfur 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 SCR denitration catalyst provided by the invention, such as figure 1 shown, including the following steps:

[0036] S1. Preparation of catalyst carrier:

[0037] S1.1. Under stirring conditions, add cerium nitrate solution to glucose solution, and react under hydrothermal conditions at 150-200 °C for 24-48 h. drying for 12-24 hours, and calcining the obtained precipitate in a nitrogen atmosphere at 500-600°C for 2-6 hours to obtain a mixture of cerium oxide and carbon;

[0038] S1.2. Disperse the prepared mixture of cerium oxide and carbon in absolute ethanol, then add ammonia water, stir evenly, slowly add tetraethyl titanate dropwise, and stir at a constant temperature of 30 to 50 ° C for 24 to 48 h, The obtained precipitate is filtered, washed with water and washed with absolute ethanol, and then calcined in air at 500-600° C. for 12-24 hours to obtain titanium-cerium composite oxide hollow ...

Embodiment 1

[0051] The preparation process of the flat plate type wide temperature anti-sulfur SCR denitration catalyst of the present embodiment is as follows:

[0052] (1) Under stirring conditions, 5.84L of 1mol / L cerium nitrate solution was added to 5L of 2mol / L glucose solution, and reacted for 48h under hydrothermal conditions at 150°C; the product was filtered, washed with water and washed with absolute ethanol , dried at 60 °C for 24 h, and then the precipitate was calcined at 500 °C under nitrogen atmosphere for 6 h to obtain a mixture of cerium oxide and carbon;

[0053] (2) Disperse the above mixture in 100L of absolute ethanol, then add 400mL of 25wt% ammonia; after stirring evenly, slowly add 994g of tetraethyl titanate dropwise, and stir at a constant temperature of 30°C for 48h; the obtained precipitate is filtered, washed with water and After washing with absolute ethanol, calcination in air at 500 °C for 24 h, the catalyst carrier titanium-cerium composite oxide hollow sp...

Embodiment 2

[0060] The preparation process of the flat plate type wide temperature anti-sulfur SCR denitration catalyst of the present embodiment is as follows:

[0061] (1) Under stirring conditions, 5.84L of 1mol / L cerium nitrate solution was added to 5L of 2mol / L glucose solution, and reacted under hydrothermal conditions at 200°C for 24h; After drying at 90°C for 12h, the precipitate was calcined under nitrogen atmosphere at 600°C for 2h to obtain a mixture of cerium oxide and carbon;

[0062] (2) Disperse the above mixture in 100L of absolute ethanol, and then add 376mL of 28wt% ammonia; after stirring evenly, slowly add 994g of tetraethyl titanate dropwise, and stir at a constant temperature of 50°C for 24h; the obtained precipitate is filtered, washed with water and After washing with anhydrous ethanol, calcination in air at 600℃ for 12h, the titanium-cerium composite oxide hollow spherical carrier can be obtained;

[0063] (3) 119 g of ammonium heptamolybdate and 151.5 g of ferri...

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Abstract

The invention belongs to the field of environmental protection technology and denitration catalysis, and in particular relates to a flat plate type wide temperature anti-sulfur SCR denitration catalyst and a preparation method thereof. The carrier of the catalyst of the present invention is a hollow sphere of titanium-cerium composite oxide, the active component of the catalyst is vanadium pentoxide, and the catalyst assistants are ferric oxide, molybdenum trioxide and barium sulfate; a two-step roll forming process is adopted : First, the catalyst promoter is loaded on the surface of the titanium-cerium composite oxide hollow sphere by the equal volume impregnation method, and then the catalyst active component vanadium pentoxide is loaded on the surface of the carrier, and the catalyst is formed into a flat plate by a roll forming process. A flat-plate SCR denitration catalyst with wide temperature resistance to sulfur poisoning was obtained. The catalyst of the invention has good catalytic activity and anti-sulfur poisoning performance in the range of 150-450 DEG C, and can solve the problem that the catalyst has low activity in low-temperature flue gas, sulfur poisoning and SO in medium-temperature flue gas. 2 The problem of high oxidation rate is suitable for wide temperature sulfur-containing flue gas denitrification.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and denitration catalysis, and in particular relates to a flat plate type wide-temperature anti-sulfur SCR denitration catalyst. The invention also provides a preparation method of the flat-plate wide-temperature sulfur-resistant SCR denitration catalyst. Background technique [0002] Selective Catalytic Reduction (SCR, Selective Catalytic Reduction) is currently the most widely used flue gas denitrification technology, with the advantages of high denitrification efficiency and good selectivity. SCR denitration technology uses ammonia gas as reducing agent under the action of catalyst 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 denitration activity and sulfur resistance, but its active temperature range is narr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/053B01J23/10B01J35/02B01J35/08B01J32/00B01D53/86B01D53/56B01J35/00
CPCB01J27/053B01J23/10B01D53/8628B01D2251/2062B01D2258/0283B01J35/40B01J35/51
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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