Flue gas denitrification catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of unbalanced active centers, unstable activity, etc., and achieve uniform particle size, catalyst The activity is stable and the effect of increasing the crystal transition temperature

Active Publication Date: 2018-04-17
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 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 400g 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 was dissolved in oxalic acid solution. After ultrasonic vibration for 2 hours, ammonia water was gradually added to adjust the pH value to 9.5. After the precipitation was complete, filter and wash; then the washed material was made into a slurry with a water content of 50% by deionized water , added with V 2 o 5 A total of 18g 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 14.5g of ammonium metatungstate solution was made into a slurry with a water content of 30%. After stirring, 2.5g of scallop powder was added, stirred for 40 minutes, sealed and left for 24 hours, dried, and roasted at 620°C for 8 hours to obtain a denitrification catalyst. The crus...

Embodiment 2

[0042] will contain TiO 2 400g 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 was dissolved in oxalic acid solution, ultrasonically oscillated for 1.5 hours and then gradually added ammonia water to adjust the pH value to 10. After the precipitation was complete, filter and wash; then the washed material was made into a slurry with a water content of 50% by deionized water material, add V 2 o 5 A total of 18g 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 13g of ammonium metatungstate solution was prepared into a slurry with a water content of 35%, and after stirring, 2g of safflower powder was added, stirred for 30min, sealed and left for 16h, dried, and roasted at 600°C to obtain a denitration catalyst. The fresh catalyst obta...

Embodiment 3

[0046] will contain TiO 2 400g of metatitanic acid is dissolved in sulfuric acid solution to form TiO-containing 2 For a 30g / L solution, add WO 3 Dissolve 20g of ammonium paratungstate in oxalic acid 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%. join with V 2 o 5 A total of 20g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1 hour. After direct drying, it was roasted at 550°C for 6 hours; after roasting, the powder was mixed with WO 3 A total of 16g ​​of ammonium metatungstate solution was made into a slurry with a water content of 30%, and after stirring, 4g of scallop powder 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 ...

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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 50-160 m<2> / g and is prepared from, in percentage by weight,80%-92% of TiO2, 8%-15% of WO3 and 4%-10% of V2O5. The preparation method comprises steps as follows: (1) a titanium source precursor is dissolved to form a solution; (2), a tungsten source precursoris 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 and washing are performed; (4)deionized 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 uniformly and directly dried and roasted; (5) the tungsten source precursor is mixed with the powder obtained in the step (4) to form slurry, sesbania powder is added after the slurry is stirred, secondary stirring is performed, the mixture is sealed, left to stand, dried and roasted, and the denitrification catalyst is formed. The prepared denitrification catalyst can resist non-uniform deposition of vanadium oxide in flue gas on the surface and improve the microporous structure and performance of the catalyst.

Description

technical field [0001] The invention relates to a flue gas denitrification catalyst and a preparation method thereof, in particular to a denitrification catalyst which resists uneven deposition of vanadium in flue gas and improves a microporous structure 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 stipulates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/30B01J2523/00B01J2523/47B01J2523/55B01J2523/69
Inventor 刘光利杨岳巫树锋荣树茂李扬王立蓉贾媛媛梁宝锋唐中华周霞李晶蕊王军
Owner PETROCHINA CO LTD
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