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A kind of denitrification catalyst and preparation method thereof

A denitrification catalyst and precursor technology, applied in chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of unstable activity and unbalanced active centers, and achieve stable catalyst activity. The effect of uniform dispersion and tight connection

Active Publication Date: 2019-06-07
PETROCHINA CO LTD
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  • Summary
  • 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 and its preparation method to overcome the defects of unbalanced active centers and unstable activity of denitrification catalysts in the high temperature flue gas in the prior art

Method used

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  • A kind of denitrification catalyst and preparation method thereof

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Effect test

Embodiment 1

[0040] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, adding 3 A total of 22.5g of ammonium paratungstate solution to form TiO 2 It is a 35g / L mixed 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% from the washed material, 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, dried, and roasted at 620°C for 8h to obtain a denitration catalyst. The fresh catalyst obtained above and the catalyst mi...

Embodiment 2

[0044] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, adding 3 A total of 22.5g of ammonium paratungstate solution to form TiO 2 It is a 30g / L mixed solution. After ultrasonic vibration for 1.5h, gradually add ammonia water to adjust the pH value to 10. After the precipitation is complete, filter and wash; then use deionized water to make a slurry with a water content of 50%, and add 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 was used to make a slurry with a water content of 35%. After stirring, 3.5g of polyethylene oxide was added, stirred for 30 minutes, sealed and left for 16 hours, dried, and roasted at 600°C to obtain a denitration catalyst. The fresh catalyst obtained above and the catalyst mixed with the catal...

Embodiment 3

[0048] will contain TiO 2 500g of metatitanic acid was dissolved in the sulfuric acid solution, adding 3 A total of 20g of ammonium paratungstate solution to form TiO 2 It is a 30g / L mixed 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, dried, and roasted at 550°C to obtain a denitration catalyst. The fresh catalyst obtained above and the catalyst mixed with the catalytic cracking vana...

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Abstract

The invention discloses a denitration catalyst and a preparation method thereof. (1) Dissolve the titanium source precursor in sulfuric acid to form a solution; (2) Dissolve the tungsten source precursor in water and add it to the solution in step (1). in; (3) After ultrasonic oscillation of the solution obtained in step (2), adjust the pH value to greater than 9.0 with ammonia water, precipitate, filter, and wash; (4) Add deionized water to the filter cake obtained in step (3), and adjust into a slurry, add the vanadium source precursor solution, oscillate with ultrasonic waves, and then directly dry and bake to form a powder; and (5) mix the powder in step (4) with the ammonium metatungstate solution into a slurry, and stir Finally, polyethylene oxide is added, and after secondary stirring, it is sealed and left to stand, dried, and roasted to form a denitration catalyst. The denitrification catalyst prepared by the invention can not only resist the uneven deposition of vanadium oxide in the flue gas on its surface, but also ensure high catalyst performance, and the catalytic performance is relatively stable.

Description

technical field [0001] The invention relates to a preparation method of a flue gas denitration catalyst, in particular to a preparation method of a denitration catalyst resistant to uneven deposition of vanadium in flue gas, and 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 rebui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J35/10B01D53/86B01D53/56
CPCB01D53/8625B01J23/002B01J23/30B01J2523/00B01J35/60B01J2523/47B01J2523/55B01J2523/69
Inventor 巫树锋贾媛媛唐中华李扬李常青江岩郭珺刘发强刘光利梁宝锋杨岳王军何琳张媛李晶蕊荣树茂文善雄周霞
Owner PETROCHINA CO LTD
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