Preparation of low-temperature NH3-SCR catalyst with slice-shaped V2O5/TiO2 as carrier and application of catalyst in denitration

A technology of NH3-SCR and catalyst, which is applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, perfluorocarbon/hydrofluorocarbon capture, etc., to achieve good low-temperature denitrification efficiency, The effect of low temperature and uniform size

Active Publication Date: 2015-11-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its applications are mainly concentrated in the fields of photocatalysis and solar cells. 2 The application of the [001] facet exposed by the sheet-like morphology in the field of selective catalytic reduction needs to be further studied

Method used

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  • Preparation of low-temperature NH3-SCR catalyst with slice-shaped V2O5/TiO2 as carrier and application of catalyst in denitration
  • Preparation of low-temperature NH3-SCR catalyst with slice-shaped V2O5/TiO2 as carrier and application of catalyst in denitration
  • Preparation of low-temperature NH3-SCR catalyst with slice-shaped V2O5/TiO2 as carrier and application of catalyst in denitration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Flake TiO 2 Preparation of carrier: Add 18ml of hydrogen peroxide aqueous solution (30%wt) and 3ml of hydrofluoric acid solution (40%wt) mixture dropwise to 15ml of butyl titanate under stirring. The mixture was transferred into a 100ml teflon liner. After loading into a stainless steel autoclave, keep it in a blast drying oven at 200°C for 24h, and then cool to natural room temperature. The final product was suction filtered, washed several times with deionized water and alcohol, and then dried at room temperature. get flake TiO 2 carrier.

[0032] (2) Active ingredient V 2 o 5 Loading: Dissolve oxalic acid with deionized water in a 60°C water bath, and then add ammonium metavanadate to the oxalic acid solution until completely dissolved. Finally, the flake-like TiO 2 The samples were immersed in the above solutions. After magnetic stirring for 2h, sonication for 2h. Then, the catalyst samples were dried in a blast oven at 110°C for 5 hours and then calcin...

Embodiment 2

[0035] (1) Flake TiO 2 Preparation of carrier: Add 20 ml of hydrogen peroxide aqueous solution (30%wt) and 2ml of hydrofluoric acid solution (40%wt) mixture dropwise to 16ml of butyl titanate under stirring. The mixture was transferred into a 100ml teflon liner. After loading into a stainless steel autoclave, keep it in a blast drying oven at 200°C for 20h, and then cool to natural room temperature. The final product was suction filtered, washed several times with deionized water and alcohol, and then dried at room temperature. get flake TiO 2 carrier.

[0036] (2) Active ingredient V 2 o 5 Loading: Dissolve oxalic acid with deionized water in a 60°C water bath, and then add ammonium metavanadate to the oxalic acid solution until completely dissolved. Finally, the flake-like TiO 2 The samples were immersed in the above solutions. After magnetic stirring for 1 h, ultrasonication for 3 h. Then, the catalyst samples were dried in a blast oven at 110°C for 7 hours and the...

Embodiment 3

[0038] (1) Flake TiO 2 Preparation of carrier: Add 20 ml of hydrogen peroxide aqueous solution (30%wt) and 2ml of hydrofluoric acid solution (40%wt) mixture dropwise to 16ml of butyl titanate under stirring. The mixture was transferred into a 100ml teflon liner. After loading into a stainless steel autoclave, keep it in a blast drying oven at 200°C for 20h, and then cool to natural room temperature. The final product was suction filtered, washed several times with deionized water and alcohol, and then dried at room temperature. get flake TiO 2 carrier.

[0039] (2) Active ingredient V 2 o 5 Loading: Dissolve oxalic acid with deionized water in a 60°C water bath, and then add ammonium metavanadate to the oxalic acid solution until completely dissolved. Finally, the flake-like TiO 2 The samples were immersed in the above solutions. After magnetic stirring for 1 h, ultrasonication for 3 h. Then, the catalyst samples were dried in a blast oven at 110°C for 7 hours and the...

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Abstract

The invention discloses a preparation of a low-temperature NH3-SCR catalyst with slice-shaped V2O5 / TiO2 as a carrier and application of the catalyst in denitration and belongs to the field of environment protecting and environment catalyzing. The catalyst is prepared in the manner that the slice-shaped TiO2 serves as the carrier, and V2O5 active components are loaded through an impregnation method, wherein the content of V2O5 is 3wt%, and the content of TiO2 is 97 wt%. The slice-shaped TiO2 serves as the carrier, and compared with commercial TiO2P25, the slice-shaped TiO2 has regular features and better crystallinity. The slice-shaped TiO2 preferentially exposes a high-energy crystal face [001], mutual action between the carrier and the active components is improved through the high surface energy, higher reducibility is achieved, and the NH3-SCR denitration activity of the catalyst is enhanced. NH3 serves as a reducing agent, and compared with a vanadium-titanium catalyst prepared through a commercial P25 carrier and an octahedral carrier, the slice-shaped vanadium-titanium catalyst has better low-temperature denitration activity, and at the temperature of 250 DEG C, the denitration activity can reach 98 percent and is higher than that of other catalyst by 20 percent or more.

Description

technical field [0001] The invention belongs to the field of environmental protection and environmental catalysis, and in particular relates to a carrier V 2 o 5 / TiO 2 Cryogenic NH 3 -SCR catalyst. Background technique [0002] Nitrogen oxides (NOx) can cause photochemical smog, acid rain, ozone depletion and the greenhouse effect, causing serious harm to the environment and human health. Researchers have implemented various methods to reduce NOx emissions from stationary and mobile sources. In particular, selective catalytic reduction (SCR) with ammonia is generally considered to be the most promising method for removing NOx from flue gas. So far, the application of SCR has been concentrated in power industries such as thermal power plants, while non-power industries such as industrial boilers are rarely used. Its working temperature also urgently needs to be lowered to a low temperature range of 100-200°C. Catalyst is a very important part, several metal oxides suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01D53/56B01D53/86
CPCY02C20/30
Inventor 何洪张然宋丽云闫京芳陈云秦二兰陆丹婷冯照璐崔华玉
Owner BEIJING UNIV OF TECH
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