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Flue gas denitrification catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problems of unbalanced active centers, unstable activity, etc., and achieve improved crushing strength, catalyst The effect of stable activity and resistance to uneven deposition on the surface

Active Publication Date: 2018-04-17
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 flue gas denitrification catalyst and its preparation method, so as to overcome the defects of unbalanced active center and unstable activity of the denitrification catalyst in the prior art in high temperature flue gas

Method used

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  • Flue gas denitrification catalyst and preparation method thereof

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Embodiment 1

[0039] will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For a 35g / L solution, add 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 trichloroacetic acid was added, stirred for 40min, sealed and left for 24h, dried, and roasted at 620°C for 8h to obtain a denitrification catalyst. The crushing strength of the catalyst is 28.3kg / cm 2 , the wear rate is 0.062%, and...

Embodiment 2

[0043] will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For a 30g / L solution, add 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 was used to make a slurry with a water content of 35%. After stirring, 3.5g of trichloroacetic acid was added, stirred for 30min, sealed and left for 16h, dried, and roasted at 600°C to obtain a denitrification catalyst. The fresh catalyst obtained above and the catal...

Embodiment 3

[0047] will contain TiO 2 500g of metatitanic acid is dissolved in sulfuric acid solution to form TiO 2 For a 30g / L solution, add 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 trichloroacetic acid was added, stirred for 30min, sealed and left for 20h, dried, and roasted at 550°C to obtain a denitrification catalyst. The fresh catalyst obtained above and the catalyst mixed with the catalytic cracking vanadium-con...

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Abstract

The invention discloses a flue gas denitrification catalyst and a preparation method thereof. The catalyst has the specific surface area of 50-130 m<2> / g, has the pore volume of 0.30-0.70 cm<3> / g andis prepared from, in percentage by weight, 90%-97% of TiO2, 1%-10% of WO3 and 0.5%-5% of V2O5. The preparation method comprises steps as follows: (1) a titanium source precursor forms a solution; (2),a tungsten source precursor is dissolved and mixed with the solution obtained in the step (1); (3) the pH value of the solution obtained in the step (2) is adjusted, and precipitation, filtration andwashing are performed; (4) water is added to the filter cake obtained in the step (3), the filter cake is blended into slurry, a vanadium precursor solution is added, and the mixture is mixed, driedand roasted; (5) the solution formed by the tungsten source precursor is mixed with the powder obtained in the step (4) to form slurry, a pore-forming aid is added after the slurry is stirred, and thedenitrification catalyst is formed. The prepared denitrification catalyst can resist non-uniform deposition of vanadium oxide in flue gas on the surface, increase the specific surface area and the crushing strength of the catalyst, reduce the wear rate and improve the performance of the catalyst.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/30B01J37/088B01J2523/00B01J35/613B01J35/615B01J2523/47B01J2523/55B01J2523/69
Inventor 刘光利杨岳梁宝锋李扬巫树锋贾媛媛荣树茂王立蓉唐中华王军李晶蕊周霞
Owner PETROCHINA CO LTD
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