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Tungsten oxide surface modified Fe2O3 catalyst as well as preparation method and application thereof

A surface modification and catalyst technology, applied in the field of tungsten oxide surface modified Fe2O3 catalyst, preparation and application, to achieve the effect of widening the operating temperature window and good NOx purification efficiency

Active Publication Date: 2013-06-26
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the prior art, few researchers have reported on Fe 2 o 3 The material is surface modified to substantially increase its NH 3 -SCR response performance

Method used

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  • Tungsten oxide surface modified Fe2O3 catalyst as well as preparation method and application thereof

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Embodiment 1

[0045] A kind of Fe modified by tungsten oxide surface 2 o 3 Catalyst, described catalyst has following chemical composition: WO x / Fe 2 o 3 , x=2~3, the WO x The mass percent of the catalyst is 1wt.%.

[0046] A kind of Fe modified by tungsten oxide surface 2 o 3 The preparation method of catalyst, described method comprises the steps:

[0047] (1) Prepare ferric nitrate solution, add excess urea precipitant to the solution, the molar ratio of urea / iron source is 10:1, stir continuously for 12 hours in a water bath at 90°C to completely precipitate iron ions, and filter the precipitate and washed, and then the filter cake was dried in an oven at 100°C for 5h, and finally calcined in a muffle furnace at 500°C for 3h in an air atmosphere to obtain Fe 2 o 3 ;

[0048] (2) In the presence of oxalic acid, ammonium tungstate solution was prepared to control WO x Accounting for the mass percent of the catalyst is 1wt.%, adding Fe to the ammonium tungstate solution 2 o 3...

Embodiment 2

[0050] A kind of Fe modified by tungsten oxide surface 2 o 3 Catalyst, described catalyst has following chemical composition: WO x / Fe 2 o 3 , x=2~3, the WO x The mass percent of the catalyst is 5wt.%.

[0051] A kind of Fe modified by tungsten oxide surface 2 o 3 The preparation method of catalyst, described method comprises the steps:

[0052] (1) Prepare ferric nitrate solution, add excess urea precipitant to the solution, the molar ratio of urea / iron source is 10:1, stir continuously for 12 hours in a water bath at 90°C to completely precipitate iron ions, and filter the precipitate and washed, and then the filter cake was dried in an oven at 100°C for 5h, and finally calcined in a muffle furnace at 500°C for 3h in an air atmosphere to obtain Fe 2 o 3 ;

[0053] (2) In the presence of oxalic acid, ammonium tungstate solution was prepared to control WO x Accounting for the mass percent of the catalyst is 5wt.%, adding Fe to the ammonium tungstate solution 2 o 3...

Embodiment 3

[0055] A kind of Fe modified by tungsten oxide surface 2 o 3 Catalyst, described catalyst has following chemical composition: WO x / Fe 2 o 3 , x=2~3, the WO x The mass percent of the catalyst is 10wt.%.

[0056] A kind of Fe modified by tungsten oxide surface 2 o 3 The preparation method of catalyst, described method comprises the steps:

[0057] (1) Prepare ferric nitrate solution, add excess urea precipitant to the solution, the molar ratio of urea / iron source is 10:1, stir continuously for 12 hours in a water bath at 90°C to completely precipitate iron ions, and filter the precipitate and washed, and then the filter cake was dried in an oven at 100°C for 5h, and finally calcined in a muffle furnace at 500°C for 3h in an air atmosphere to obtain Fe 2 o 3 ;

[0058] (2) In the presence of oxalic acid, ammonium tungstate solution was prepared to control WO x Accounting for the mass percent of the catalyst is 10wt.%, adding Fe to the ammonium tungstate solution 2 o ...

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Abstract

The invention relates to a tungsten oxide surface modified Fe2O3 catalyst comprising the following chemical compositions: WOx / Fe2O3(x=2-3), wherein the mass percent of WOx in the catalyst is 1-10 wt.%. The invention further discloses a method for preparing the catalyst. The NH3 selective catalytic reduction activity of surface non-modified Fe2O3 material into NOx (NH3-SCR) is extremely low, the operation temperature window is extremely narrow, and a large amount of N2O side product is generated, but the NH3-SCR catalyst activity and the N2 generation selectivity are remarkably improved after WOx surface modification. The tungsten oxide surface modified Fe2O3 catalyst as well the preparation method and the application thereof are suitable for catalytic elimination of stationary source and mobile source NOx.

Description

technical field [0001] The invention relates to a tungsten oxide surface modified Fe 2 o 3 Catalyst, preparation method and use thereof, said catalyst is used for NH 3 Selective Catalytic Reduction of NO x . Background technique [0002] As an environmentally friendly catalytic material, iron oxides can be used in a variety of catalytic reactions. due to F e 3+ and F e 2+ There is a good redox cycling ability between them, and Fe-based catalysts also have good catalytic NH 3 Selective reduction of NO x capacity (NH 3 -SCR), can be used for fixed source and mobile source NO x catalytic elimination to replace the conventional vanadium-based (V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 ) catalyst system. [0003] Previously, researchers mainly focused on Fe 2 o 3 Shape-controllable synthesis of materials (X.Mou, B. Zhang, Y. Li, L. Yao, X. Wei, D. S. Su, W. Shen, Angew. Chem. Int. Ed., 2012, 51:2989) , Fe 2 o 3 Highly dispersed loading of materials on carrier materials (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/90B01D53/56
CPCY02C20/10
Inventor 贺泓刘福东连志华谢利娟石晓燕
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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