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A kind of anti-sulfur dioxide oxidation denitrification catalyst and preparation method thereof

A denitration catalyst, sulfur dioxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of poor sulfur resistance, unbalanced active centers, and unstable activity. and other problems, to achieve the effect of uniform dispersion, stable catalyst activity and high catalyst performance

Active Publication Date: 2020-01-03
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 resistant to sulfur dioxide oxidation and its preparation method to overcome the defects of unbalanced active centers, poor sulfur resistance and unstable activity of denitrification catalysts in the prior art

Method used

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  • A kind of anti-sulfur dioxide oxidation denitrification catalyst and preparation method thereof

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Embodiment 1

[0040] will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For a 35g / L solution, add MoO 3 A total of 22.5g of ammonium paramolybdate 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% , 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 620°C for 8h; after roasting, the powder was mixed with MoO 3 A total of 7.5g of ammonium molybdate 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 immersing in 10% ethanol solution of ester for 15 seconds, filtering, drying, and roasting at 620° C. ...

Embodiment 2

[0044] will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For 30g / L solution, add MoO 3 A total of 22.5g of ammonium molybdate solution, ultrasonically oscillated for 1.5h, then gradually added 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% , 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 MoO 3 A total of 5g of ammonium molybdate solution was made into a slurry with a water content of 35%. After stirring, 3.5g of polyethylene oxide was added, stirred for 30min, sealed and left for 16h, and dried; The denitration catalyst was obtained after 10 seconds in a 5% ethanol solution of the ester, filtered, dried, and roasted at 600°C. The fresh cataly...

Embodiment 3

[0048] will contain TiO 2 500g of metatitanic acid is dissolved in sulfuric acid solution to form TiO 2 For 30g / L solution, add MoO 3 A total of 20g of ammonium molybdate 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%, add with 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 MoO 3 A total of 5g of ammonium molybdate solution was made into 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; In 8% ethanol solution for 6s, filter, dry, and roast 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 denitration catalyst with resistance to sulfur dioxide oxidation and a preparation method of the denitration catalyst. The denitration catalyst contains 80%-98% by weight oftitanium dioxide, 1%-10% by weight of molybdenum trioxide, 0.3%-5% by weight of vanadium pentoxide and 0.1%-5% by weight of silicon dioxide. The preparation method comprises the following steps: (1) asolution I is formed from a titanium source precursor; (2) a solution II is formed from a molybdenum source precursor and mixed with the solution I in step (1); (3) pH of the solution obtained in step (2) is regulated, and the solution is filtered; (4) deionized water is added to a filter cake obtained in step (3), a vanadium source precursor solution is added, and the mixed solution is subjectedto mixed drying and roasting; (5) the molybdenum source precursor solution is mixed with powder in step (4), a pore-forming additive is added, and the mixture is dried; (6) a dried product in step (5) is dipped in a silicon source precursor solution and roasted. The prepared denitration catalyst has the advantages that vanadium oxide in flue gas can be prevented from non-uniform deposition on thesurface of the catalyst, high catalytic performance is guaranteed, and low sulfur dioxide / sulfur trioxide conversion rate is realized.

Description

technical field [0001] The invention relates to a flue gas denitration catalyst resistant to sulfur dioxide oxidation and a preparation method thereof, in particular to a denitration catalyst resistant to uneven vanadium deposition 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 stipulates that the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/28B01J2523/00B01J2523/47B01J2523/41B01J2523/55B01J2523/68
Inventor 巫树锋刘光利贾媛媛刘发强梁宝锋唐中华王军杨岳
Owner PETROCHINA CO LTD
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