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Flat-plate wide-temperature sulfur-resistant selective catalytic reduction (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., achieve excellent anti-sulfur poisoning performance, excellent wide The effect of temperature activity and improving the anti-sulfur poisoning performance

Active Publication Date: 2020-02-18
北京华电光大环境股份有限公司
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  • Summary
  • 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

Method used

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  • Flat-plate wide-temperature sulfur-resistant selective catalytic reduction (SCR) denitration catalyst and preparation method thereof
  • Flat-plate wide-temperature sulfur-resistant selective catalytic reduction (SCR) denitration catalyst and preparation method thereof
  • Flat-plate wide-temperature sulfur-resistant selective catalytic reduction (SCR) denitration catalyst and preparation method thereof

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preparation example Construction

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

[0036] S1. Catalyst carrier preparation:

[0037] S1.1. Under stirring conditions, add cerium nitrate solution to glucose solution, and react under hydrothermal conditions at 150-200°C for 24-48h. Drying under low temperature for 12-24 hours, and roasting 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 30-50°C for 24-48h, After the obtained precipitate is filtered, washed with water and absolute ethanol, it is roasted at 500-600° C. in air for 12-24 hours to obtain titanium-cerium composite oxide hollow sphe...

Embodiment 1

[0051] The preparation process of the flat-plate wide-temperature sulfur-resistant SCR denitration catalyst in this embodiment is as follows:

[0052] (1) Under stirring conditions, add 5.84L of 1mol / L cerium nitrate solution to 5L of 2mol / L glucose solution, and react under hydrothermal conditions at 150°C for 48h; the product is filtered, washed with water and washed with absolute ethanol , dried at 60°C for 24h, then calcined the precipitate at 500°C for 6h under a nitrogen atmosphere 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 water; 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, calcining at 500°C in the air for 24 hours, the hollow spheres of titanium cerium composite oxide as catalyst carrier can...

Embodiment 2

[0060] The preparation process of the flat-plate wide-temperature sulfur-resistant SCR denitration catalyst in this embodiment is as follows:

[0061] (1) Add 5.84L of 1mol / L cerium nitrate solution to 5L of 2mol / L glucose solution under stirring conditions, and react under hydrothermal conditions at 200°C for 24h; Drying at 90°C for 12 hours, and then roasting the precipitate at 600°C for 2 hours in a nitrogen atmosphere to obtain a mixture of cerium oxide and carbon;

[0062] (2) Disperse the above mixture in 100L of absolute ethanol, then add 376mL of 28wt% ammonia water; 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 absolute ethanol, calcining at 600°C in air for 12 hours, the titanium-cerium composite oxide hollow sphere carrier can be obtained;

[0063] (3) Ammonium heptamolybdate 119g and ferric nitrate nonahydrate...

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Abstract

The invention belongs to the field of environmental protection technology and denitration catalysis, and particularly relates to a flat-plate wide-temperature sulfur-resistant selective catalytic reduction (SCR) denitration catalyst and a preparation method thereof. A carrier of the catalyst provided by the invention is a titanium-cerium composite oxide hollow sphere, an active component of the catalyst is vanadium pentoxide, and catalytic auxiliary agents are ferric oxide, molybdenum trioxide and barium sulfate. A two-step rolling molding process is adopted, wherein the catalytic auxiliary agents are loaded on the surface of the titanium-cerium composite oxide hollow sphere by adopting an incipient-wetness impregnation method; then the catalyst active component vanadium pentoxide is loaded on the surface of the carrier; and the catalyst is molded into a flat plate shape through a rolling molding process, so that the flat-plate SCR denitration catalyst with a wide temperature and sulfur poisoning resistance is prepared. The catalyst has good catalytic activity and sulfur poisoning resistance in a range of 150-450 DEG C, can solve the problems of low activity and sulfur poisoning ofa catalyst in low-temperature flue gas and high SO2 oxidation rate in medium-temperature flue gas, and is suitable for denitration of wide-temperature sulfur-containing 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 SCR denitrification catalyst. The invention also provides a preparation method of the flat 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, which has the advantages of high denitrification efficiency and good selectivity. The SCR denitrification technology 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 The catalyst has high denitrification activity and sulfur resistance, but its active te...

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
CPCB01J27/053B01J23/10B01D53/8628B01D2251/2062B01D2258/0283B01J35/40B01J35/51
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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