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Vanadium-titanium oxide catalyst, and preparation method and application thereof

A vanadium-titanium oxide and catalyst technology, which is applied in the field of cerium-doped vanadium-titanium oxide catalyst and vanadium-titanium oxide catalyst, can solve the problems of being easily affected by alkali metal poisoning

Inactive Publication Date: 2012-11-07
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problem that vanadium-based catalysts, especially vanadium-titanium oxide catalysts, are easily affected by alkali metal poisoning, the present invention has carried out doping modification on the vanadium-based catalysts, and for the first time proposes a Ce-doped vanadium-based catalysts can be used as stationary source flue gas denitrification

Method used

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  • Vanadium-titanium oxide catalyst, and preparation method and application thereof
  • Vanadium-titanium oxide catalyst, and preparation method and application thereof
  • Vanadium-titanium oxide catalyst, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0065] Ce-doped V 2 o 5 / WO 3 -TiO 2 Catalyst, where V 2 o 5 The loading amount was 1%, and the Ce / V molar ratio was 4. After each precursor salt is dissolved into an aqueous solution and mixed uniformly, commercial titanium tungsten powder (WO 3 Content 5wt%), the solution volume to titanium tungsten powder mass ratio is 10:1 (mL / g), continuously stirred at 30°C for 2h, after rotary evaporation, put the obtained catalyst into an oven and dry at 100°C overnight, Finally, the powder catalyst was obtained by calcining in air at 500°C for 5 hours in a muffle furnace. Grind and sieve the prepared catalyst, take 40-60 mesh for later use, and call it catalyst Ce4VWTi.

Embodiment 2

[0069] The Ce4VWTi in Example 1 and the VWTi catalyst powder in Comparative Example 1 were poisoned with K element. KNO 3 Soluble in aqueous solution according to KNO 3 The solution volume and catalyst powder mass ratio were 2:1 for impregnation, and the K addition amount was K / V with a molar ratio of 4. Catalyst powder impregnated in KNO 3 After 12 hours of solution, it was dried in an oven at 100°C, and then calcined in air at 500°C for 3 hours in a muffle furnace to obtain a powdered poisoned catalyst. Grind and sieve the prepared poisoned catalysts, and take 40-60 meshes for later use, which are called catalysts K-Ce4VWTi and K-VWTi.

Embodiment 3

[0071] The Ce4VWTi in Example 1 and the VWTi catalyst powder in Comparative Example 1 were poisoned with Ca. Ca(NO 3 ) 2 4H 2 O was dissolved in the aqueous solution, impregnated according to the volume ratio of calcium nitrate solution to catalyst powder mass ratio of 2:1, and the Ca addition amount was Ca / V molar ratio of 8. The catalyst powder was soaked in calcium nitrate solution for 12 hours, dried in an oven at 100°C, and calcined in air at 500°C for 5 hours in a muffle furnace to obtain a powdered poisoned catalyst. Grind and sieve the prepared poisoned catalyst, and take 40-60 mesh for later use, called catalysts Ca-Ce4VWTi and Ca-VWTi.

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Abstract

The invention relates to a vanadium-titanium oxide catalyst which can resist alkaline metal and alkaline earth metal poisoning. The catalyst is characterized in that the vanadium-titanium oxide catalyst is doped with an element Ce. The catalyst has fine resistance to alkaline metal poisoning, and above all, the doped cerium component has no influence on the activity of the SCR (selective catalytic reduction) catalyst while improving the resistance of the V2O5 / (MoO3)x(WO3)1-x-TiO2 catalyst to alkaline metal poisoning. The preparation method of the catalyst is simple and easy to implement and has very excellent N2 generation selectivity; and meanwhile, the Ce is a non-poisonous component and can not do harm to human health and ecological environment.

Description

technical field [0001] The invention relates to a vanadium-titanium oxide catalyst, in particular to a cerium-doped vanadium-titanium oxide catalyst, which can be used for ammonia selective catalytic reduction to purify nitrogen oxides in flue gas, and belongs to the technical field of environmental catalysis. Background technique [0002] The flue gas emitted by coal-fired boilers contains SO 2 , NO x and dust and other harmful components, among which nitrogen oxides (NO x ) is one of the key pollutants to be controlled. Since the 1970s, developed countries such as Europe, the United States, and Japan have successively implemented NO x The emissions are restricted, and with the development of technology and economy, the restrictions are becoming stricter. [0003] Fuel burning is NO x The main source of carbon dioxide (accounting for 90% of the total human emissions), my country is a developing country that mainly burns coal. With the rapid development of the economy, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/28B01D53/90B01D53/56
Inventor 贺泓石晓燕连志华刘福东谢利娟丁世鹏
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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