SO2 oxidation rate reducing honeycomb type vanadium-free flue gas denitration catalyst and preparation method thereof

A denitrification catalyst and oxidation rate technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of unbalanced active centers, poor formability, unstable activity, etc., and achieve increased density , increase strength, and stabilize catalyst activity

Inactive Publication Date: 2017-09-22
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The main purpose of the present invention is to provide a kind of reducing SO 2 Oxidation rate honeycomb vanadium-free flue gas denitrification catalyst and its preparation method, to overcome the defects of unbalanced active center, poor formability and unstable activity of denitrification catalyst in flue gas in the prior art

Method used

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  • SO2 oxidation rate reducing honeycomb type vanadium-free flue gas denitration catalyst and preparation method thereof
  • SO2 oxidation rate reducing honeycomb type vanadium-free flue gas denitration catalyst and preparation method thereof

Examples

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Embodiment 1

[0058] 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 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 and wash; then use deionized water to make a slurry with a water content of 50%, and add CeO 2 A total of 30g of cerium nitrate solution, stirred for 1.5h, dried, roasted at 620°C for 8h, and then ground into a powder with a particle size of less than 20μm; the powder was then mixed with WO 3 A total of 7.5g of ammonium metatungstate, 4g of stearic acid, 3g of polyethylene oxide and deionized water were used to make a paste with a water content of 30%, and the pH value was adjusted to 8.5 with ammonia water, and after stirring, 5g of nano-silica, 17.5g of Glass fiber, 4g carboxymethyl cellulose, stirred for 40min, sealed and allowed to stand for 24h, ...

Embodiment 2

[0062] 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 to form TiO 2 It is a 30g / L mixed solution. After stirring 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% from the washed material, and add CeO 2 A total of 25g of cerium nitrate solution, stirred for 1.5h, dried, roasted at 620°C for 8h, and then ground into a powder with a particle size of less than 30μm; the powder was mixed with WO 3 A total of 7.5g of ammonium metatungstate, 3.5g of stearic acid, 3.5g of polyethylene oxide and deionized water to make a paste with a water content of 32%, adjust the pH value to 8.0 with ammonia water, add 4.5g of nano silicon dioxide after stirring , 17.5g glass fiber, 4g carboxymethyl cellulose, stir for 40min, seal and let stand for 24h, the...

Embodiment 3

[0066] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, adding 3 A total of 20g of ammonium metatungstate solution to form TiO 2 It is a 30g / L mixed solution. After stirring for 1.0h, gradually add ammonia water to adjust the pH value to 9. After the precipitation is complete, filter and wash; then use deionized water to make a slurry with a water content of 45%, and add CeO 2 A total of 20g of cerium nitrate solution, stirred for 1.0h, dried, roasted at 620°C for 8h, and then ground into a powder with a particle size of less than 15μm; the powder was then mixed with WO 3 A total of 5g of ammonium metatungstate, 3.0g of stearic acid, 3.0g of polyethylene oxide and deionized water were used to make a paste with a water content of 28%, and the pH value was adjusted to 8.2 with ammonia water, and after stirring, 3.5g of nano-silica, 22.5g glass fiber, 3g carboxymethyl cellulose, stir for 40min, seal and let stand for 24h, then use extruder...

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Abstract

The present invention discloses a SO2 oxidation rate reducing honeycomb type vanadium-free flue gas denitration catalyst and a preparation method thereof. The preparation method comprises: dissolving a titanium source precursor in an acid to form a solution; dissolving a tungsten source precursor to form a solution; uniformly mixing the two solutions, adjusting the pH value to 7-12, precipitating, filtering, adding deionized water and a rare earth precursor solution, uniformly mixing, directly drying, roasting, and grinding to obtain powder; adding the solution formed from an extrusion aid and the tungsten source precursor and a pore forming agent to the powder, adding water while stirring to form a paste, adding nano-silica, glass fiber and a binder, uniformly mixing, and extruding a honeycomb type billet by using an extruder; and placing the dried billet into a silicon source precursor solution, impregnating, and roasting to obtain the finished product. According to the present invention, the defects of unbalanced activity center, poor molding property and unstable activity of the denitration catalyst in the flue gas in the prior art can be overcome.

Description

technical field [0001] The invention relates to a method for reducing SO 2 Oxidation rate honeycomb vanadium-free flue gas denitrification catalyst and its preparation method, especially a denitrification catalyst resistant to uneven deposition of vanadium in flue gas and its preparation method, 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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J37/03B01J37/02B01J37/08B01J35/10B01J35/04B01D53/86B01D53/56
CPCB01J23/30B01D53/8628B01D2258/0283B01J23/002B01J35/04B01J35/1014B01J35/1019B01J37/0018B01J37/0201B01J37/0236B01J37/031B01J37/08B01J37/088B01J2523/00B01J2523/3712B01J2523/41B01J2523/47B01J2523/69
Inventor 刘光利贾媛媛巫树锋唐中华王军杨岳梁宝锋李晶蕊荣树茂周霞
Owner PETROCHINA CO LTD
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