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Vanadium-free denitration catalyst and preparation method thereof

A denitrification catalyst and pore-forming agent technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve problems such as unstable activity and unbalanced active centers, and achieve stable catalyst activity , uniform dispersion and tight connection

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 vanadium-free denitration catalyst and its preparation method to overcome the defects of unbalanced active centers and unstable activity of denitration catalysts in the flue gas in the prior art

Method used

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  • Vanadium-free denitration catalyst and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0037] 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 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 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 with the catalytic cracking vanadium-containing waste catalyst were evaluated separate...

Embodiment 2

[0041] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 20g of ammonium molybdate 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 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 catalyst mixed with the catalytic cracking vanadium-containing waste catalyst were evaluated separately,...

Embodiment 3

[0045] 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 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 MoO 3 A total of 6g 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 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 vanadiu...

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Abstract

The invention discloses a vanadium-free denitration catalyst and a preparation method thereof. The preparation method comprises steps 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 are formed into a solution, and the solution is evenly mixed with the solution in the step (1); (3) the material obtained in the step (2) is mixed uniformly, pH of the solution is adjusted to 7-12, and precipitating and filtering are performed; (4) water is added to a filter cake obtained in the step (3), the solution is mixed into a slurry I, a rare earth source precursor solution is added, drying and roasting are performed after mixing, and the material is ground into powder; (5) the powder in the step (4) is mixed with one of the tungsten source precursor solution and the molybdenum source precursor solution, a slurry II is formed and stirred, a pore-forming agent is added, the mixture is 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 vanadium-free denitration catalyst and a preparation method thereof, in particular to a preparation method of a denitration catalyst resistant to heavy metal deposition 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 re...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/28B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/28B01J23/30B01J2523/00B01D2258/0283B01J35/61B01J35/64B01J2523/47B01J2523/69B01J2523/3712B01J2523/68
Inventor 巫树锋张立基贾媛媛刘光利杨会芳唐中华王军杨岳张敦荣禄军让
Owner PETROCHINA CO LTD
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