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Denitration catalyst with improved low-temperature activity and preparation method of denitration catalyst

A denitrification catalyst and active technology, applied in the direction of chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of low-temperature active center imbalance and unstable activity, and achieve stable catalyst activity. Uniform dispersion and guaranteed catalyst performance

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

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a denitrification catalyst with improved low-temperature activity and its preparation method, so as to overcome the defects of unbalanced low-temperature active centers and unstable activity of denitrification catalysts in the flue gas in the prior art

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Effect test

Embodiment 1

[0044] will contain TiO 2 A total of 500g of titanyl sulfate was dissolved in sulfuric acid solution, respectively added with MnO 2 30g of manganese nitrate, Fe 2 o 3 15g of ferric nitrate, in WO 3 Total 22.5g of ammonium metatungstate 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 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 CeO 2 A total of 40g of cerium nitrate solution, stirred for 1.5h, dried directly, and roasted at 620°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 620°C for 8h to obtain a denitration catalyst. The fresh catalyst obtained above and the catalyst mixed wi...

Embodiment 2

[0048] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the solution containing MnO is added 2 25g of manganese nitrate, Fe 2 o 3 10g of ferric nitrate, in WO 3 A total of 20g of ammonium metatungstate solution 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 CeO 2 A total of 30g of cerium nitrate 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 6g of ammonium metatungstate 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 obtaine...

Embodiment 3

[0052] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the solution containing MnO is added 2 22.5g of manganese nitrate, as Fe 2 o 3 9g of ammonium metatungstate, expressed as WO 3 A total of 20g of ammonium metatungstate solution 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 CeO 2 A total of 25g of cerium nitrate 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 5g of ammonium metatungstate solution was made into a slurry with a water content of 30%. After stirring, 3.5g 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 o...

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Abstract

The invention discloses a denitration catalyst with improved low-temperature activity and a preparation method of the denitration catalyst. The preparation method comprises the steps as follows: (1) dissolving a titanium source precursor in acid to form a solution; (2) forming solutions from a manganese source precursor, an iron source precursor and a tungsten source precursor, and uniformly mixing the solutions with the solution in the step (1); (3) regulating pH of the evenly mixed solution obtained in the step (2) to 7-12, and performing precipitation and filtration; (4) adding deionized water to a filter cake obtained in the step (3), blending the mixture into slurry, and adding a rare earth source precursor, performing dry and roasting after uniform mixing, and grinding the mixture into powder; (5) mixing the powder obtained in the step (4) and a tungsten source precursor solution into slurry, stirring the slurry, adding a pore-forming agent, uniformly mixing the mixture, and performing drying and roasting to form the denitration catalyst. The denitration catalyst for improving low-temperature activity and the preparation method of the denitration catalyst are designed to overcome the defects of imbalanced low-temperature activity center and instable activity of the denitration catalyst in flue gas in the prior art.

Description

technical field [0001] The invention relates to a denitration catalyst with improved low-temperature activity and a preparation method thereof, in particular to a preparation method of a denitration catalyst with high-low temperature activity. 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, exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/8892B01D2258/0283B01J2523/00B01J35/60B01J35/61B01J2523/47B01J2523/72B01J2523/69B01J2523/842B01J2523/3712
Inventor 贾媛媛巫树锋唐中华刘光利王军刘发强杨岳韦清华王语林李杨
Owner PETROCHINA CO LTD
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