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A zirconium-doped vanadium-based oxide catalyst, preparation method and use thereof

A zirconium oxide and catalyst technology, applied in the field of zirconium-doped vanadium-tungsten-titanium oxide catalysts, can solve problems such as poor high-temperature stability, and achieve the effects of excellent high-temperature stability and excellent N2 generation selectivity.

Active Publication Date: 2015-09-30
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For existing NH 3 -The shortcomings of SCR catalysts, in order to solve the shortcomings of the vanadium-based oxide catalyst system such as poor high-temperature stability, the present invention provides a zirconium-doped vanadium-tungsten-titanium oxide catalyst and its preparation method for the first time, which can be used for diesel vehicle exhaust Mobile sources represented by NO and stationary sources represented by flue gas from coal-fired power plants x Catalytic purification, the present invention is preferably used for NO in diesel vehicle exhaust x Catalytic purification

Method used

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  • A zirconium-doped vanadium-based oxide catalyst, preparation method and use thereof
  • A zirconium-doped vanadium-based oxide catalyst, preparation method and use thereof

Examples

Experimental program
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Embodiment 1

[0038] Dissolve 0.964g ammonium metavanadate in oxalic acid solution (mass ratio of ammonium metavanadate to oxalic acid is 1:2), make 750ml mixed solution, mix well, add 25g titanium tungsten powder (10% WO 3 -TiO 2 ), fully stirred for 1 h, and then the mixed slurry was rotatably evaporated until the water was fully volatilized, dried at 100 °C for 12 h, and finally roasted at 550 °C for 3 h to obtain 3% V 2 o 5 / 10% WO 3 -TiO 2 catalyst.

[0039] Grind and sieve the prepared catalyst, and take 40-60 mesh for later use, which is called catalyst A.

Embodiment 2

[0041] 0.964g ammonium metavanadate (NH 4 VO 3 ) was dissolved in oxalic acid solution (the mass ratio of ammonium metavanadate to oxalic acid was 1:2), and 1.74g of zirconium nitrate pentahydrate (Zr(NO 3 ) 4 ·5H 2 O), prepared into 750mL mixed solution, mix well, add 25g titanium tungsten powder (10%WO 3 -TiO 2 ), fully stirred for 1 h, and then the mixed slurry was rotatably evaporated until the water was fully volatilized, dried at 100 °C for 12 h, and finally roasted at 550 °C for 3 h to obtain 3% V 2 o 5 -2%ZrO 2 / 10% WO 3 -TiO 2 catalyst.

[0042] Grind and sieve the prepared catalyst, and take 40-60 mesh for later use, which is called catalyst B.

Embodiment 3

[0044] Other conditions are as embodiment 2 constant, change zirconium nitrate pentahydrate add-on to be 4.36g, obtain 5% V 2 o 5 -2%ZrO 2 / 10% WO 3 -TiO 2 catalyst. Grind and sieve the prepared catalyst, and take 40-60 mesh for later use, which is called catalyst C.

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Abstract

The invention relates to a zirconium-doped vanadium-based oxide catalyst for selectively catalyzing and reducing the nitrogen oxide through ammonia, and a preparation method thereof. The catalyst is a metal oxide catalyst which is formed by loading zirconium and vanadium oxide onto the surface of titanium tungsten powder. Through the zirconium doping method, the catalytic properties such as high-temperature stability of the traditional vanadium-based catalyst and the N2 (nitrogen) generation selectivity can be greatly improved, the prepared zirconium-doped vanadium-based oxide catalyst is suitable for a nitrogen oxide catalytic purifying device adopting the diesel exhaust as a representative movable resource and the smoke of a coal plant as a representative fixed source.

Description

technical field [0001] The present invention relates to a catalyst, in particular to a zirconium-doped vanadium-tungsten-titanium oxide catalyst for catalytic purification of nitrogen oxides, in particular to a mobile source represented by diesel vehicle exhaust and a coal-fired power plant Flue gas is represented by a zirconium-doped vanadium-tungsten-titanium oxide catalyst for catalytic purification of stationary source nitrogen oxides. Background technique [0002] Nitrogen oxides (NO x , mainly referring to NO and NO 2 ) is an important pollutant in the atmosphere. NO x It has strong biological toxicity and can cause direct harm to human health, especially the respiratory system. In addition, NO x It can also cause major environmental problems such as acid rain and photochemical smog. Control NO x The emission of pollutants is an important problem that needs to be solved urgently in the field of environmental protection. [0003] In stationary source NO x and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/94B01D53/56
Inventor 贺泓单文坡刘福东连志华谢利娟杨卫卫
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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