Denitration catalyst and preparation method thereof

A technology of denitration catalyst and co-catalyst group, applied in the field of inorganic new materials, can solve the problems of unstable activity and unbalanced active center, and achieve the effect of resisting uneven deposition, uniform dispersion and good catalyst activity

Inactive Publication Date: 2017-11-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a denitrification catalyst and its preparation method to overcome the defects of unbalanced active center and unstable activity of denitrification catalyst in the flue gas in the prior art

Method used

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  • Denitration catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, adding 3 A total of 22.5g of ammonium metatungstate and 5g of ammonium fluoride solution in terms of F form a TiO-containing 2 It is a 35g / L mixed solution. After stirring for 2 hours, gradually add ammonia water to adjust the pH value to 9.5. After the precipitation is complete, filter and wash; then use deionized water to make a slurry with a water content of 50%, and add V 2 o 5 A total of 12.5g of ammonium metavanadate solution, stirred for 1.5h, dried directly, and roasted at 600°C for 8h; after roasting, the powder was mixed with WO 3 A total of 7.5g of ammonium metatungstate solution was made into a slurry with a water content of 30%. After stirring, 4g of polyethylene oxide was added, stirred for 40min, sealed and left for 24h, dried, and roasted at 600°C for 8h to obtain a denitration catalyst. The fresh catalyst obtained above and the catalyst mixed with the catalytic cra...

Embodiment 2

[0042] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 20g of ammonium molybdate and 4g of ammonium fluoride solution in terms of F to form TiO 2 It is a 35g / L mixed solution. After stirring for 2 hours, gradually add ammonia water to adjust the pH value to 8.5. After the precipitation is complete, filter and wash; then use deionized water to make a slurry with a water content of 50%, and add V 2 o 5 A total of 11.5g of ammonium metavanadate solution, stirred for 1.5h, dried directly, and roasted at 600°C for 8h; after roasting, the powder was mixed with MoO 3 A total of 7.5g of ammonium molybdate solution was made into a slurry with a water content of 30%. After stirring, 4g of polyethylene oxide was added, stirred for 40 minutes, sealed and left for 24 hours, dried, and roasted at 600°C for 8 hours to obtain a denitration catalyst. The fresh catalyst obtained above and the catalyst mixed with the catalytic cracking vanadium...

Embodiment 3

[0046] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 20g of ammonium molybdate, in WO 3 20g of ammonium metatungstate and 4g of ammonium fluoride solution in terms of F to form TiO-containing 2 It is a 35g / L mixed solution. After stirring for 2 hours, gradually add ammonia water to adjust the pH value to 8.5. After the precipitation is complete, filter and wash; then use deionized water to make a slurry with a water content of 50%, and add V 2 o 5 A total of 10g of ammonium metavanadate solution, stirred for 1.5h, dried directly, and roasted at 600°C for 8h; after roasting, the powder was mixed with MoO 3 A total of 6g of ammonium molybdate solution was used to make a slurry with a water content of 30%. After stirring, 4g of polyethylene oxide was added, stirred for 40 minutes, sealed and left for 24 hours, dried, and roasted at 600°C for 8 hours to obtain a denitration catalyst. The fresh catalyst obtained above and the c...

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Abstract

The invention discloses a denitration catalyst and a preparation method thereof. The method comprises steps are as follows: (1) a titanium source precursor is formed into a solution; (2) an assistant catalysis component precursor containing one or two of a tungsten source precursor and a molybdenum source precursor and a fluorine source precursor are formed into a solution, and the solution is mixed with the solution in the step (1) to form a mixed solution; (3) pH of the mixed solution is adjusted, precipitating, washing and filtering are performed, and a filter cake is obtained; (4) water is added to the obtained filter cake, a slurry I is formed, a vanadium source precursor solution is added, drying and roasting are performed after mixing, and the material is ground into powder; (5) the powder is mixed with one of the tungsten source precursor and the molybdenum source precursor, a slurry II is formed and stirred, a pore-forming agent is added, the mixture is evenly mixed, dried and roasted, and the denitration catalyst is formed. The prepared denitration catalyst can overcome the defects that the denitration catalyst in the prior art is uneven in activity center in flue gas and unstable in activity.

Description

technical field [0001] The invention relates to a preparation method of a denitration catalyst, in particular to a preparation method of a denitration catalyst resistant to uneven deposition of heavy metals in flue gas. The invention belongs to the technical field of new inorganic materials. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, and the emission requirements are becoming increasingly stringent. my country's "Twelfth Five-Year Plan" Comprehensive Work Plan for Energy Conservation and Emission Reduction stipulates that by 2015, the total national nitrogen oxide emissions will drop by 10% compared with 2010. In September 2011, the Ministry of Environmental Protection promulgated GB13223-2001 "Emission Standards of Air Pollutants for Thermal Power Plants", which made stricter requirements on the NOx emission concentration of thermal power plants: it stipulates that the coal-fired boilers newly built, expanded and rebuilt in the...

Claims

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Application Information

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IPC IPC(8): B01J27/135B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J27/135B01D2258/0283B01J35/61B01J35/60
Inventor 巫树锋刘光利贾媛媛唐中华王军刘发强梁宝锋杨岳韦清华王语林
Owner PETROCHINA CO LTD
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