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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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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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. The preparation method comprises the following steps: (1) dissolving a titanium-source precursor in sulfuric acid so as to form a solution; (2) dissolving a tungsten-source precursor in water and adding the obtained solution into the solution obtained in the step (1); (3) subjecting a mixed solution obtained in the step (2) to ultrasonic oscillation, then adjusting the pH value of the mixed solution to more than 9.0 by using ammonia water and successively carrying out precipitation, filtering and washing; (4) adding deionized water into a filter cake obtained in the step (3) to obtain paste, adding a vanadium-source precursor solution and carrying out ultrasonic oscillation, and directly carrying out drying and roasting so as to obtain powder; and (5) mixing the powder obtained in the step (4) with an ammonium metatungstate solution so as to obtain paste, carrying out stirring, adding polyoxyethylene, then carrying out secondary stirring and successively carrying out hermetic standing, drying and roasting so as to obtain the denitration catalyst. The denitration catalyst prepared in the invention can prevent nonuniform deposition of vanadium oxide in flue gas on the surface of the denitration catalyst, ensures high catalyst performance and has stable catalysis performance.

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
CPCB01D53/8625B01J23/002B01J23/30B01J35/10B01J2523/00B01J2523/47B01J2523/55B01J2523/69
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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