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CeO2@MnOx low-temperature SCR flue gas denitrification catalyst as well as preparation method thereof and application thereof

A denitration catalyst and flue gas technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. The low temperature does not meet the problems of the catalyst's optimal activity temperature and heating flue gas, and achieves excellent low-temperature catalytic performance, improved anti-toxicity, increased specific surface area and acidity.

Inactive Publication Date: 2017-05-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current commercial vanadium-titanium catalyst (V 2 o 5 / TiO 2 ) is its core catalyst, which has a high optimum activation temperature (300–400°C), and the denitrification system is usually arranged before the desulfurization and dust removal device, so the requirements for the catalyst’s anti-dust and anti-poisoning performance are relatively high; if the denitrification system Installed after the desulfurization and dust removal device, the flue gas temperature is low and does not meet the optimum activation temperature of the catalyst, and the flue gas needs to be reheated, which will increase energy consumption

Method used

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  • CeO2@MnOx low-temperature SCR flue gas denitrification catalyst as well as preparation method thereof and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Solution configuration: Weigh 2.45g of inorganic manganese source (manganese acetate tetrahydrate, purity greater than 99%) and fully dissolve in 80mL deionized water, and fully stir for 10min to obtain solution A; weigh 0.0125g PEG6000 (purity greater than 99%) was dissolved in 30mL deionized water, and fully stirred for 10min to obtain solution B; weigh 3mL NH 4 .OH (purity greater than 99%) was dissolved in 60mL deionized water, and fully stirred for 10min to obtain solution C;

[0036] (2)MnO xFormation: Add solution B and solution C dropwise to solution A obtained in step (1) successively, and fully stir and react for 1.5h, the reaction product is washed and dried at 60°C for 12h to obtain a solid powder;

[0037] (3) MnO x Roasting: the powder obtained in step (2) was placed in a tube furnace, and heated at 0.5°C·min in an air atmosphere -1 Roast at 400°C for 4h, cool to room temperature to get MnO x nanoparticles;

[0038] (4)CeO 2 @MnO x Preparation: ...

Embodiment 2

[0042] (1) Solution configuration: Weigh 2.45g of inorganic manganese source (manganese acetate tetrahydrate, purity greater than 99%) and fully dissolve in 80mL deionized water, and fully stir for 10min to obtain solution A; weigh 0.0125g PEG6000 (purity greater than 99%) was dissolved in 30mL deionized water, and fully stirred for 10min to obtain solution B; weigh 5mL NH 4 .OH (purity greater than 99%) was dissolved in 60mL deionized water, and fully stirred for 10min to obtain solution C;

[0043] (2) MnO x Formation: Add solution B and solution C dropwise to solution A obtained in step (1) successively, and fully stir the reaction for 2 hours, the reaction product is washed and dried at 60°C for 12 hours to obtain a solid powder;

[0044] (3) MnO x Roasting: put the powder obtained in step (2) in a tube furnace, and heat it at 1°C·min in an air atmosphere -1 Roast at 500°C for 3h, cool to room temperature to get MnO x nanoparticles;

[0045] (4)CeO 2 @MnO x Preparat...

Embodiment 3

[0049] (1) Solution configuration: Weigh 2.45g of inorganic manganese source (manganese acetate tetrahydrate, purity greater than 99%) and fully dissolve in 80mL deionized water, and fully stir for 10min to obtain solution A; weigh 0.0125g PEG6000 (purity greater than 99%) was dissolved in 30mL deionized water, and fully stirred for 10min to obtain solution B; weigh 5mL NH 4 .OH (purity greater than 99%) was dissolved in 60mL deionized water, and fully stirred for 10min to obtain solution C;

[0050] (2) MnO x Formation: Add solution B and solution C dropwise to solution A obtained in step (1) successively, and fully stir and react for 1.8h, the reaction product is washed and dried at 60°C for 10h to obtain a solid powder;

[0051] (3) MnO x Roasting: put the powder obtained in step (2) in a tube furnace, and heat it at 1°C·min in an air atmosphere -1 Roast at 500°C for 2h, cool to room temperature to get MnO x nanoparticles;

[0052] (4)CeO 2 @MnO x Preparation: Weigh ...

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Abstract

The invention discloses a CeO2@MnOx low-temperature SCR flue gas denitrification catalyst as well as a preparation method thereof and an application thereof. An MnOx nanoparticle prepared through a precipitation method is taken as an inner core, and CeO2 is packaged on the outer layer of the MnOx nanoparticle through an in-situ liquid-phase deposition method, and roasting is performed to prepare the CeO2@MnOx low-temperature SCR flue gas denitrification catalyst with a core-shell structure, wherein in the prepared CeO2@MnOx low-temperature SCR flue gas denitrification catalyst, a mass ratio of MnOx to CeO2 is 1 to (0.4-1.2). The CeO2@MnOx low-temperature SCR flue gas denitrification catalyst has the core-shell structure, greatly improves oxidization-reduction capacity of an active component MnOx, and has excellent NOx catalytic reduction activity at a temperature of 110-200 DEG C.

Description

technical field [0001] The invention relates to the technical field of preparation of SCR flue gas denitrification catalysts, in particular to a CeO 2 @MnO x Low-temperature SCR flue gas denitrification catalyst, preparation method and application thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the air pollutants, which will cause a series of environmental problems such as acid rain, photochemical smog, ozone layer hole and fine particle pollution, which will cause great harm to human health and ecological environment. Effective control and reduction of nitrogen oxide emissions is the key to improving the atmosphere The urgent need for environmental quality. Selective catalytic reduction of ammonia (NH 3 -SCR) technology is currently the most widely used and most mature technology to control stationary source NO x Methods. The current commercial vanadium-titanium catalyst (V 2 o 5 / TiO 2 ) is its core catalyst, which has a high optimum activ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062B01D2258/06B01J23/34
Inventor 黄碧纯李时卉
Owner SOUTH CHINA UNIV OF TECH
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