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Manganese-based low-temperature flue gas denitration catalyst and preparation method thereof

A denitrification catalyst and low-temperature flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of easy poisoning and deactivation, low denitrification efficiency, etc., achieve wide application range and improve denitrification activity , Improve the effect of catalyst activity

Pending Publication Date: 2019-04-05
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention makes full use of fly ash, properly modifies it, increases the specific surface area, and makes silicon dioxide, aluminum oxide, iron oxide, etc. form active salt compounds, improves catalyst denitrification activity, and solves the problem of SCR denitrification Catalysts have problems such as low denitrification efficiency and easy poisoning and deactivation under low temperature flue gas conditions

Method used

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  • Manganese-based low-temperature flue gas denitration catalyst and preparation method thereof
  • Manganese-based low-temperature flue gas denitration catalyst and preparation method thereof

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preparation example Construction

[0046] The present invention also provides a preparation method of a manganese-based low-temperature flue gas denitrification catalyst, comprising the following steps:

[0047] (1) Grind the fly ash to 4-20um, add 3-15% dilute nitric acid solution to the fly ash, the mass ratio of fly ash to nitric acid solution is 1:3-50, stir at room temperature for 30-120min Carry out modification, the modified fly ash is washed with deionized water until neutral, and dried at 120°C;

[0048] (2) Mix the modified fly ash and TiO 2 Mechanically mix evenly;

[0049] (3) Deionized water is used to configure an oxalic acid solution with a concentration of 5%, and the cerium salt, tungsten salt, tin salt, and iron salt precursor are dissolved in the oxalic acid solution to form a metal salt solution, and the temperature of the solution is controlled at 45-75° C.;

[0050] (4) add manganese nitrate solution or manganese acetate solution in (3) solution;

[0051] (5) Add the mixed carrier in st...

Embodiment 1

[0056] 1. Grind 65g of fly ash to 4-20um, add 500ml of dilute nitric acid solution with a concentration of 10% to the fly ash and stir for 60min at room temperature for modification. The modified fly ash is washed with deionized water to Neutral, dry at 120°C for 4 hours;

[0057] 2. Mix 50g of modified fly ash with 50g of anatase TiO 2 Mix evenly with a ball mill;

[0058] 3. Prepare 200ml of oxalic acid solution with a concentration of 5%, and control the temperature of the solution at 55°C, and dissolve 12.61g of cerium nitrate hexahydrate in the dilute oxalic acid solution;

[0059] 4, add 41.17g 50% manganese nitrate solution in (3) solution;

[0060] 5. Add the mixed carrier in step (2) to the solution prepared in step (4), stir evenly, and impregnate. The impregnation temperature is 85°C, and the impregnation time is 4 hours;

[0061] 6. Dry the slurry obtained by impregnating in step (5) at 110° C. for 8 hours, and bake at 450° C. for 6 hours in an air atmosphere to...

Embodiment 2

[0064] 1. Grind 65g of fly ash to 4-20um, add 500ml of dilute nitric acid solution with a concentration of 10% to the fly ash and stir for 60min at room temperature for modification. The modified fly ash is washed with deionized water to Neutral, dry at 120°C for 4 hours;

[0065] 2. Mix 50g of modified fly ash with 50g of anatase TiO 2 Mix evenly with a ball mill;

[0066] 3. Prepare 200ml of oxalic acid solution with a concentration of 5%. The temperature of the solution is controlled at 55°C, and 6.03g of ammonium metatungstate is dissolved in the dilute oxalic acid solution;

[0067] 4. Add 41.17g50% manganese nitrate solution to (3) solution;

[0068] 5. Add the mixed carrier in step (2) to the solution prepared in step (4), stir evenly, and impregnate. The impregnation temperature is 85°C, and the impregnation time is 4 hours;

[0069] 6. Dry the slurry obtained by impregnating in step (5) at 110° C. for 8 hours, and bake at 450° C. in an air atmosphere for 6 hours to...

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Abstract

The invention provides a manganese-based low-temperature flue gas denitration catalyst and a preparation method thereof. The catalyst takes nitric acid modified fly ashes and TiO2 as a composite carrier, MnOx as an active component, one or more of CeO2, WO3, SnO2 and Fe2O3 as active additives, wherein the active component and the active additives are loaded on the surface of the carrier by an excess impregnation method; and the mass ratio of the catalytic active component, the catalytic additives, the fly ashes and the TiO2 is (0.05-0.15): (0.05-0.2): (0.3-0.6): (0.5-0.7). The catalyst has good low-temperature denitration activity, and thus serious environmental pollution caused by a vanadium denitration catalyst is avoided; and meanwhile, a cheap raw material of fly ashes with a wide range of sources is placed to partially replace TiO2 as the carrier, and thus the high-efficiency utilization of solid waste resources is realized, the specific surface area of the catalyst is increased,the low-temperature denitration performance is improved, and the production cost of the catalyst is reduced.

Description

technical field [0001] The invention belongs to the technical field of catalyst material preparation and air pollution control, and in particular relates to a manganese-based low-temperature flue gas denitrification catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere, selective catalytic reduction (SCR) is considered to be one of the most effective technologies for controlling nitrogen oxide emissions, and has been widely used. SCR catalysts for industrial applications are mainly V 2 o 5 -WO 3 / TiO 2 Catalyst, which has high denitrification activity and good resistance to sulfur poisoning, but the application temperature range is 300-420°C, and the denitrification efficiency is low at lower temperatures. It is suitable for steel, coking, glass, ceramics, waste incineration, etc. It is not suitable for non-electric industries with low exhaust gas temperature, and vanadium is a to...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/34B01D2258/0283B01J35/615
Inventor 张向辉胡洧冰王蕾郑珩
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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