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.

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.

CN103252232BActive Publication Date: 2015-09-30RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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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
Comparison scheme
Effect test

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

Patent Timeline
30 Sep 2015
Publication
CN103252232B
IPC
B01J23/30; B01D53/94; B01D53/56
Inventors
贺泓; 单文坡