Honeycomb type flue gas denitrification catalyst and preparation method thereof

A denitrification catalyst, honeycomb technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve problems such as poor resistance to poisoning, unbalanced active centers, and unstable activity, etc., to achieve Increase density, improve water resistance, and stabilize catalyst activity

Inactive Publication Date: 2017-08-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a honeycomb flue gas denitrification catalyst and its preparation method to overcome the defects of unbalanced active center, poor resistance to poisoning and unstable activity of the denitrification catalyst in the prior art

Method used

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  • Honeycomb type flue gas denitrification catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0056] 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 V 2 o 5 A total of 4.5g of ammonium metavanadate 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 40 minutes, sealed and left for 2...

Embodiment 2

[0060] 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 V 2 o 5 A total of 4.5g of ammonium metavanadate 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 then 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 st...

Embodiment 3

[0064] 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 V 2 o 5 A total of 5g of ammonium metavanadate 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 mixed with WO 3A total of 5g of ammonium metatungstate, 3.0g of stearic acid, 3.0g of polymethyl methacrylate 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 nanometer di Silicon oxide, 22.5g glass fiber, 3g carboxymethyl cellulose, stir for 40min, seal and let stand for...

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Abstract

The invention discloses a honeycomb type flue gas denitrification catalyst and a preparation method thereof. The preparation method comprises the following steps: dissolving a titanium source precursor into acid, so as to form a solution; respectively dissolving a tungsten source precursor so as to form a solution; uniformly mixing the two solutions, adjusting the pH value of a mixed solution, settling, washing, and filtering so as to obtain a filter cake; blending to form slurry, adding a vanadium source precursor solution, uniformly mixing, directly drying and roasting, and grinding into powder; adding an extruding aid, the phosphorus source precursor solution and a pore forming agent into the powder, adjusting the pH value to be alkaline, adding nano-silica, glass fibers and a bonding agent, uniformly mixing, and extruding a honeycomb type blank by virtue of an extruding machine; and drying and roasting, so as to obtain a finished product. The honeycomb type flue gas denitrification catalyst prepared by virtue of the preparation method is capable of resisting heavy metal deposition in flue gas and simultaneously has high catalytic performance and low sulfur dioxide / sulfur trioxide conversion rate.

Description

technical field [0001] The invention relates to a honeycomb flue gas denitration catalyst and a preparation method thereof, in particular to a denitration catalyst resistant to uneven deposition of heavy metals 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 coal-fired boilers new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/04B01J35/10B01D53/86B01D53/56B01D53/90
CPCB01J23/30B01D53/8628B01D53/90B01D2255/20707B01D2255/20723B01D2255/20776B01D2255/2092B01D2255/30B01D2258/0283B01J23/002B01J35/04B01J35/10B01J2523/00B01J2523/55B01J2523/69B01J2523/47B01J2523/31B01J2523/41
Inventor 巫树锋贾媛媛刘光利刘选礼聂普选禄军让唐中华杨岳王军梁宝锋
Owner PETROCHINA CO LTD
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