Denitration catalyst, preparation method thereof, and flue gas denitration method

A denitration catalyst and flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of narrow activity temperature window, poor thermal stability, difficult industrial application, etc., and achieve wide and low temperature activity. The effect of temperature range, strong thermal stability and low activation temperature

Active Publication Date: 2017-08-15
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these catalysts have good activity in the low temperature region, due to the poor dispersion of the active components of these catalysts on the carrier, the active temperature window is relatively narrow, and the thermal stability is poor, so it is difficult for industrial application.

Method used

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  • Denitration catalyst, preparation method thereof, and flue gas denitration method
  • Denitration catalyst, preparation method thereof, and flue gas denitration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Carrier pretreatment

[0055] The titanium dioxide is calcined at 200°C for 2 hours to remove impurities. After the treatment, it is placed in a desiccator for use. The TiO after removal 2 The purity is 95.7%, and the specific surface is 80.656m 2 / g.

[0056] (2) Doping of molybdenum oxide

[0057] 0.001molNa 2 MoO 4 2H 2 O is dissolved in the oxalic acid solution that 200ml concentration is 0.005mol / L, the TiO prepared by 0.1mol step (1) 2 Add it into the above molybdenum salt solution, stir evenly for 2 hours, then ultrasonically impregnate the slurry at 20KHz for 50 minutes, and then dry it in an oven at 105°C for 12 hours; take it out and grind it into a 40-60 mesh powder, and calcinate it in a muffle furnace at 350°C 3h, prepared MoO X / TiO 2 Carrier, MoO X Fully doped in TiO 2 Among them, the specific surface of the carrier is 98.656m 2 / g.

[0058] (3) Loading of active components

[0059] The raw material of the active component is MnSO 4 ·H ...

Embodiment 2

[0062] (1) Carrier pretreatment

[0063] The titanium dioxide is calcined at 200°C for 2 hours to remove impurities. After the treatment, it is placed in a desiccator for use. The TiO after removal 2 The purity is 95.7%, and the specific surface is 80.656m 2 / g.

[0064] (2) Doping of molybdenum oxide

[0065] 0.0025molNa 2 MoO 4 2H 2 O is dissolved in the ammonia solution of 0.0125mol / L in 200ml concentration, the TiO prepared by 0.1mol step (1) 2 Add it into the above molybdenum salt solution, stir evenly for 4 hours, then ultrasonically impregnate the slurry at 30KHz for 20 minutes, then dry it in an oven at 125°C for 14 hours; take it out and grind it into a 40-60 mesh powder, and calcinate it in a muffle furnace at 500°C 2h, prepared MoO X / TiO 2 carrier, the specific surface of the carrier is 102.314m 2 / g.

[0066] (3) Loading of active components

[0067] The raw material of the active component is MnCl 2 4H 2 O and Ce(NO 3 ) 3 ·6H 2 O, calculate the re...

Embodiment 3

[0070] (1) Carrier pretreatment

[0071] The titanium dioxide is calcined at 350°C for 2 hours to remove impurities. After the treatment, it is placed in a desiccator for use. The TiO after removal 2 The purity is 97.1%, and the specific surface is 90.521m 2 / g.

[0072] (2) Doping of molybdenum oxide

[0073] 0.003molNa 2 MoO 4 2H 2 O is dissolved in the citric acid solution that 200ml concentration is 0.015mol / L, the TiO prepared by 0.1mol step (1) 2 Add it into the above molybdenum salt solution, stir evenly for 3 hours, then ultrasonically impregnate the slurry at 10KHz for 150 minutes, then dry it in an oven at 150°C for 12 hours; take it out and grind it into 40-60 mesh powder, and calcinate it in a muffle furnace at 700°C 1h, prepared MoO X / TiO 2 carrier, the specific surface of the carrier is 113.213m 2 / g.

[0074] (3) Loading of active components

[0075] The raw material of the active component adopts manganese nitrate solution and Ce(NO 3 ) 3 ·6H 2 O...

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Abstract

The invention discloses a denitration catalyst, a preparation method thereof and a flue gas denitration method, wherein the effective components of the denitration catalyst are composed of manganese oxide, titanium oxide, cerium oxide and molybdenum oxide, and the manganese oxide, titanium The content of the oxide, cerium oxide and molybdenum oxide is in the molar ratio of Mn:Ti:Ce:Mo=0.015-0.1:1:0.005-0.015:0.01-0.05 in terms of metal elements. The denitrification catalyst has high catalytic activity and a wide range of low-temperature active temperatures, and can achieve a denitrification rate of more than 85% at the stage of 80-250°C. When the catalyst is used for denitrification of low-temperature flue gas, no heating is required before denitrification, which reduces energy consumption.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a denitration catalyst, a preparation method thereof and a flue gas denitration method. Background technique [0002] Selective catalytic reduction (SCR) technology is based on NH 3 As a reducing agent, under the action of a denitrification catalyst, NO x reduced to N 2 and H 2 O's technology. The denitrification efficiency can reach more than 90% stably, and it has a lower ammonia escape rate than the selective non-catalytic reduction (SNCR) technology. At present, the most widely used catalysts are vanadium-tungsten-titanium catalysts. Because the catalysts of this system need to maintain a relatively high catalytic reaction temperature, generally around 300-430°C, it is necessary to arrange the SCR reactor in front of the desulfurization and dust removal device, but at this time The flue gas environment is harsh, such as the flue gas contains a relatively high concentra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56B01D53/75B01D53/48
Inventor 吴彦霞梁海龙唐婕霍艳丽
Owner CHINA BUILDING MATERIALS ACAD
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