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Sulfur-resistant and water-resistant manganese-based low-temperature denitration catalyst as well as preparation method and application thereof

A low-temperature denitrification and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of poor sulfur and water resistance and high operating temperature. Achieve the effects of good sulfur and water resistance, high low temperature activity and high stability

Active Publication Date: 2021-03-26
TIANJIN CEMENT IND DESIGN & RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems of high service temperature and poor anti-sulfur and water-resistance of current SCR catalysts, one of the purposes of the present invention is to provide a manganese-based low-temperature denitrification catalyst with anti-sulfur and water resistance, which uses OMS-2 as the main active component , vanadium oxides, transition metal oxides and rare earth metal oxides as additives, can be used for the removal of nitrogen oxides in sulfur-containing and water-containing atmospheres, and can maintain a stable denitrification efficiency for a long time

Method used

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  • Sulfur-resistant and water-resistant manganese-based low-temperature denitration catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) 1000 g of titanium dioxide powder was weighed, washed twice with deionized water, and dried at 80° C. for 5 hours to obtain carrier powder for later use.

[0031] (2) Weigh 30.28g of cerium nitrate, 9.39g of zirconium oxynitrate and 5.27g of nickel nitrate and add a certain amount of deionized water to prepare a 300ml solution, impregnate the single volume on the carrier powder, let stand for 8h, and dry at 100°C for 5h , placed in a muffle furnace and calcined at 350° C. for 5 h with a heating rate of 2° C. / min to obtain carrier powder supported by cerium oxide, zirconium oxide and nickel oxide.

[0032] (3) Take a certain amount of the above-mentioned modified carrier powder and grind it evenly, put it into a polytetrafluoroethylene hydrothermal reaction kettle, add 2.57g ammonium metavanadate and 3.95g oxalic acid, 40.36g potassium permanganate, 114.30g manganese nitrate Solution, 1ml of dilute nitric acid with a concentration of 1% and a certain amount of deioni...

Embodiment 2

[0035] (1) Weigh 1000g of titanium-tungsten powder, wash with deionized water three times, and dry at 90°C for 8 hours to obtain carrier powder for later use.

[0036] (2) Weigh 39.87g of lanthanum nitrate, 5.63g of zirconium oxynitrate and 6.05g of copper nitrate and add a certain amount of deionized water to prepare a 300ml solution, impregnate the single volume on the carrier powder, let stand for 8h, and dry at 100°C for 5h , placed in a muffle furnace and calcined at 350° C. for 5 h, with a heating rate of 2° C. / min, to obtain carrier powder supported by lanthanum oxide, zirconium oxide and copper oxide.

[0037] (3) Take a certain amount of the above-mentioned modified carrier powder and grind it evenly, put it into a polytetrafluoroethylene hydrothermal reaction kettle, add 6.43g ammonium metavanadate and 9.98g oxalic acid, 24.21g potassium permanganate, 46.96g manganese acetate , 3ml of 0.2% dilute nitric acid and a certain amount of deionized water, sealed in an autoc...

Embodiment 3

[0040](1) Weigh 400g of titanium dioxide powder and 600g of titanium-tungsten powder and mix evenly, wash with deionized water twice, and dry at 90°C for 8 hours to obtain carrier powder for later use.

[0041] (2) Weigh 32.80g of cerium nitrate, 30ml of zirconium acetate solution, 10.05g of ferric nitrate and 3.51g of cobalt nitrate and add a certain amount of deionized water to prepare a 300ml solution, impregnate the single volume on the carrier powder, let it stand for 8h, and place it at 100 ℃ drying for 5 hours, placed in a muffle furnace and calcined at 350 ℃ for 5 hours with a heating rate of 2 ℃ / min to obtain carrier powder loaded with cerium oxide, zirconia, iron oxide and cobalt oxide.

[0042] (3) Take a certain amount of the above-mentioned modified carrier powder and grind it evenly, put it into a polytetrafluoroethylene hydrothermal reaction kettle, add 3.86g ammonium metavanadate and 6.05g oxalic acid, 32.29g potassium permanganate, 62.61g manganese acetate , 1...

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Abstract

The invention relates to a sulfur-resistant and water-resistant manganese-based low-temperature denitration catalyst as well as a preparation method and an application thereof, the sulfur-resistant and water-resistant manganese-based low-temperature denitration catalyst comprises a main active component, an auxiliary agent, a carrier and a forming auxiliary agent, the main active component is OMS2, and the auxiliary agent is vanadium oxide, transition metal oxide and rare earth metal oxide; the catalyst powder is prepared by dipping and modifying carrier powder, then performing a hydrothermalmethod, and molding by an extrusion method. The obtained monolithic honeycomb catalyst is easy to produce, small in resistance, high in low-temperature activity and good in sulfur resistance and waterresistance, the NOx conversion rate of the denitration catalyst prepared by the method is kept at 85% or above within 48 hours under the conditions of 80-180 DEG C, 0-100 mg / Nm3SO2 and 2%-5% H2O, andthe denitration catalyst is suitable for removing NOx in flue gas of industries such as steel, cement and coking and the like.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a sulfur-resistant and water-resistant manganese-based low-temperature denitrification catalyst and a preparation method and application thereof. Background technique [0002] Nitrogen oxides are one of the air pollutants that seriously endanger the atmospheric environment and human health. The sources are divided into two types: fixed emission sources and mobile emission sources. With the gradual formulation and implementation of the national ultra-low emission policy, it is urgent to find A nitrogen oxide control technology with low energy consumption, low cost, high efficiency and high stability. [0003] Selective Catalytic Reduction (SCR) denitrification technology has been widely developed and applied in the power industry. However, in industries such as steel, cement, shipbuilding and coking, due to the low temperature of the flue gas and the diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/36B01J31/06B01D53/86B01D53/56B01D53/70B01J35/04
CPCB01J31/36B01J31/069B01D53/8625B01D53/8662B01D2258/0283B01D2251/2065B01J35/56Y02C20/10
Inventor 赵琳高伟强胡芝娟彭学平赵迪李帅帅
Owner TIANJIN CEMENT IND DESIGN & RES INST
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