a low so 2 /so 3 Conversion rate denitrification catalyst and preparation method thereof

A denitrification catalyst and conversion rate technology, applied in the field of new inorganic materials, can solve problems such as high conversion rate, unbalanced active center, and unstable activity, and achieve the effects of uniform dispersion, stable catalyst activity, and high catalyst performance

Active Publication Date: 2020-01-07
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a low SO 2 / SO 3 A denitrification catalyst with a high conversion rate and a preparation method thereof, to overcome the unbalanced active center of the denitrification catalyst in the prior art in high-temperature flue gas, SO 2 / SO 3 Defects of high conversion rate and unstable activity

Method used

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  • a low so <sub>2</sub> /so <sub>3</sub> Conversion rate denitrification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For a solution of 35g / L, add the solution containing WO 3 A total of 22.5g of ammonium paratungstate solution, after ultrasonic vibration 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 4.5g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1.5h. After direct drying, it was 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, and dried; The denitration catalyst was obtained after soaking in 10% ethanol solution of ethyl ester for 15 seconds, filtering, dry...

Embodiment 2

[0044] will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For a solution of 30g / L, add the solution containing WO 3 A total of 22.5g of ammonium paratungstate solution, ultrasonically oscillated for 1.5h, then gradually added ammonia water to adjust the pH value to 10, after the precipitation was complete, filtered and washed; then the washed material was made into a slurry with a water content of 50% with deionized water, and added with V 2 o 5 A total of 4.5g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1.5h. After direct drying, it was roasted at 600°C for 8h; after roasting, the powder was mixed with WO 3 A total of 5g of ammonium metatungstate solution is made into a slurry with a water content of 35%. After stirring, add 3.5g of polyethylene oxide, stir for 30min, seal and stand for 16h, and dry; put the dried catalyst powder into The denitration catalyst was obtained after immersing in 5...

Embodiment 3

[0048] will contain TiO 2 500g of metatitanic acid is dissolved in sulfuric acid solution to form TiO 2 For a solution of 30g / L, add the solution containing WO 3 A total of 20g of ammonium paratungstate solution, after ultrasonic vibration for 1 hour, 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 45%, and add V 2 o 5 A total of 5g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1h. After direct drying, it was roasted at 550°C for 6h; after roasting, the powder was mixed with WO 3 A total of 5g of ammonium metatungstate solution was used to make a slurry with a water content of 30%. After stirring, 3g of polyethylene oxide was added, stirred for 30min, sealed and left for 20h, and dried; The denitrification catalyst was obtained after 6 seconds in an 8% ethanol solution of the ester, filtered, dried, and roasted ...

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Abstract

The invention discloses a denitration catalyst with a low SO2 / SO3 conversion rate and a preparation method of the denitration catalyst. The catalyst has a specific surface area of 40-120 m<2> / g and contains TiO2, WO3, V2O5 and SiO. The preparation method comprises the following steps: (1), forming a solution from a Ti source precursor; (2), forming a solution from a W source precursor, and mixingthe solution with the solution in (1); (3), adjusting pH of the solution obtained in (2) to be alkaline and performing precipitating; (4), adding water to filter cakes obtained in (3) to form slurry,adding a V source precursor solution, and performing drying and roasting to form powder; (5), mixing the W source precursor solution with the powder in (4) to form slurry, performing stirring, and adding a pore-forming aid for seal standing and drying; (6), immersing the dried product in (5) in a Si source precursor solution, and performing drying and roasting. The prepared denitration catalyst not only can resist uneven deposition of V oxide on the surface of flue gas, but also can ensure high catalyst performance and has low SO2 / SO3 conversion rate.

Description

technical field [0001] The present invention relates to a low SO 2 / SO 3 A flue gas denitrification catalyst with high conversion rate and a preparation method thereof, especially a denitrification catalyst resistant to uneven deposition of vanadium in flue gas and a preparation method thereof, 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 s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/30B01J2523/00B01J2523/41B01J2523/47B01J2523/55B01J2523/69
Inventor 刘光利巫树锋贾媛媛王军唐中华李扬李晶蕊刘发强梁宝锋杨岳荣树茂
Owner PETROCHINA CO LTD
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