Denitration catalyst for reducing SO2 oxidation rate and preparation method thereof

A denitrification catalyst and oxidation rate technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of high oxidation rate, unbalanced active center, unstable activity, etc., to achieve uniform dispersion, catalyst Good activity and resistance to uneven deposition

Inactive Publication Date: 2017-09-19
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 kind of reducing SO 2 Oxidation rate denitration catalyst and preparation method thereof, to overcome the unbalanced active center of the denitration catalyst in the prior art in flue gas, SO 2 Defects of high oxidation rate and unstable activity

Method used

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  • Denitration catalyst for reducing SO2 oxidation rate and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0047] 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, and dried; The denitrification catalyst was obtained after immersing in 10% ethyl ester ethanol solution for 15 seconds, filtering, drying, and roas...

Embodiment 2

[0051] 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 40min, sealed and left for 24h, and dried; The denitrification catalyst was obtained by immersing in 5% ethanol solution of the ester for 10 seconds, filtering, drying, and roasting at 600° C. for 8 hours. Th...

Embodiment 3

[0055] 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 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, and dried; Put in 8% ethanol solution for 6 seconds, filter, dry, and roast at 600° C. for 8 hours to obtain a denitration catalys...

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Abstract

The invention discloses a denitration catalyst for reducing the SO2 oxidation rate and a preparation method thereof. The preparation method comprises the following steps that (1) a titanium source precursor forms a solution; (2) a fluorine source precursor and an assistant catalysis ingredient precursor formed by one or two kinds of a tungsten source precursor and a molybdenum source precursor are dissolved to form a solution; the solutions are uniformly mixed; (3) the pH value is regulated to 7 to 12; precipitation, washing and filtering are performed; (4) the mixture is prepared into a slurry state by adding water; a vanadium source precursor solution is added; after mixing, drying and roasting are performed; the mixture is ground into powder; (5) powdery substances in the step (4) and one of the tungsten source precursor solution or a molybdenum source precursor solution are mixed into the slurry state; after stirring, a pore-forming agent is added; drying is performed after mixing; (6) drying products in the step (5) are soaked in a silicon source precursor solution, and are dried and roasted to form the denitration catalyst. The prepared denitration catalyst can overcome the defects of high SO2 oxidation rate and unbalanced active center of the denitration catalyst in flue gas in the prior art.

Description

technical field [0001] The invention relates to a method for reducing SO 2 An oxidation rate denitration catalyst and a preparation method thereof, especially a preparation method of a denitration catalyst resistant to uneven deposition of vanadium 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 boile...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135B01D53/90B01D53/56
CPCB01J27/135B01D53/8628B01D53/90B01D2251/2062B01D2255/20707B01D2255/20723B01D2255/20769B01D2255/20776B01D2255/30
Inventor 贾媛媛巫树锋刘光利刘选礼聂普选禄军让唐中华杨岳王军笪敏峰
Owner PETROCHINA CO LTD
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