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Vanadium-free denitration catalyst for reducing SO2 oxidization rate and preparation method thereof

A technology of denitrification catalyst and oxidation rate, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems of unstable activity and unbalanced active centers, and achieve uniform dispersion and good catalyst activity. , the effect of tight connection

Inactive Publication Date: 2017-09-29
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 kind of reducing SO 2 Oxidation rate vanadium-free denitrification catalyst and its preparation method, to overcome the defects of unbalanced active center and unstable activity of denitrification catalyst in the prior art in flue gas

Method used

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  • Vanadium-free denitration catalyst for reducing SO2 oxidization rate and preparation method thereof
  • Vanadium-free denitration catalyst for reducing SO2 oxidization rate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, adding 3 A total of 22.5g of ammonium metatungstate solution, with CeO 2 40g of cerium nitrate solution to form TiO 2 It is a 35g / L mixed solution. After stirring for 2 hours, gradually add ammonia water to adjust the pH value to 9.5. After the precipitation is complete, filter, wash, and dry, and roast at 620°C for 8 hours; after roasting, the powder is 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, and dried; The denitration catalyst was obtained after soaking in 10% ethanol solution of ethyl ester for 15 seconds, filtering, drying, and roasting at 620° C. for 8 hours. The fresh catalyst obtained above and the catalyst after high-temperature mixing with catalytic cracking vanadium-containing spent catalyst (LDC ser...

Embodiment 2

[0042] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 A total of 20g of ammonium metatungstate solution to form TiO 2 35g / L mixed solution, with CeO 2 Calculate 30g of cerium nitrate solution, stir for 2 hours, gradually add ammonia water to adjust the pH value to 8.5, after the precipitation is complete, filter, wash, dry, and roast at 600°C for 8 hours; after roasting, the powder is mixed with MoO 3 A total of 6g of ammonium metatungstate solution was used to make 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 denitrification catalyst was obtained by immersing in 5% ethanol solution of the ester for 10 seconds, filtering, drying, and roasting at 600° C. for 8 hours. The fresh catalyst obtained above and the catalyst after high-temperature mixing with catalytic cracking vanadium-containing spent catalyst (LDC series) were e...

Embodiment 3

[0046] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 20g of ammonium metatungstate, expressed as WO 3 20g of ammonium metatungstate solution, with CeO 2 25g of cerium nitrate solution to form TiO 2 It is a 35g / L mixed solution. After stirring for 2 hours, gradually add ammonia water to adjust the pH value to 8.5. After the precipitation is complete, filter, wash, and dry, and roast at 600°C for 8 hours; after roasting, the powder is mixed with MoO 3 A total of 6g of ammonium metatungstate solution was made into a slurry with a water content of 30%. After stirring, 3.5g of polyethylene oxide was added, stirred for 40min, sealed and left for 24h, and dried; The denitration catalyst was obtained after 6 seconds in 8% ethyl ester ethanol solution, filtered, dried, and calcined at 600° C. for 8 hours. The fresh catalyst obtained above and the catalyst after high-temperature mixing with catalytic cracking vanadium-containing spe...

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Abstract

The invention discloses a vanadium-free denitration catalyst for reducing SO2 oxidization rate and a preparation method thereof. The preparation method comprises the following steps of: (1) dissolving a titanium source precursor into an acid to form a solution; (2) dissolving a rare earth precursor and a co-catalytic component precursor formed by one or two of a tungsten source precursor and a molybdenum source precursor to form a solution and uniformly mixing the solution with the solution in the step (1); (3) adjusting the pH value of the solution which is uniformly mixed in the step (2) to 7-12, and precipitating, filtering, washing, drying and the roasting the solution, and grinding the precipitate to powder; (4) mixing the powder in the step (3) with one of the tungsten source precursor solution or the molybdenum source precursor solution to slurry, stirring the mixture, adding a pore forming material, and uniformly mixing the mixture and drying the same; and (5) immersing the dried product in the step (4) in a silicon source precursor solution, and then drying and roasting the mixture to form the denitration catalyst. The vanadium-free denitration catalyst disclosed by the invention can overcome the defects that in the prior art, the active centre of the denitration catalyst in flue gas is unbalanced and the activity is unstable.

Description

technical field [0001] The invention relates to a method for reducing SO 2 The invention relates to a vanadium-free denitration catalyst with oxidation rate and a preparation method thereof, especially a preparation method of a denitration catalyst resistant to uneven deposition of vanadium in flue gas. 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 plan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J37/02B01J37/03B01J37/08B01J37/00
CPCB01J23/002B01J23/30B01J37/00B01J37/0203B01J37/031B01J37/086B01J37/088B01J2523/00B01J2523/3712B01J2523/41B01J2523/47B01J2523/69B01J2523/68
Inventor 刘光利巫树锋贾媛媛唐中华王军杨岳刘发强梁宝锋
Owner PETROCHINA CO LTD
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