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Honeycomb-type vanadium-free denitrification catalyst for reducing SO2 oxidation rate and preparation method thereof

A denitrification catalyst, honeycomb technology, applied in the field of denitrification catalyst and its preparation that resists uneven deposition of heavy metals in flue gas, can solve the problems of unstable activity and unbalanced active centers, and achieve reduced oxidation, uniform dispersion, and catalyst active effect

Inactive Publication Date: 2017-11-03
PETROCHINA CO LTD
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  • Summary
  • 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 denitrification catalyst and its preparation method, to overcome the defects of unbalanced active center and unstable activity of denitrification catalyst in flue gas in the prior art

Method used

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  • Honeycomb-type vanadium-free denitrification catalyst for reducing SO2 oxidation rate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, adding 3 22.5g of ammonium metatungstate, as P 2 o 5 4.5g of phosphoric acid, 4.5g of magnesium nitrate solution as MgO to form a TiO-containing 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 carboxy...

Embodiment 2

[0066] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, adding 3 22.5g of ammonium metatungstate, as P 2 o 5 4.0g of phosphoric acid, 4.0g of magnesium nitrate solution as MgO to form a TiO-containing 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, 4...

Embodiment 3

[0070] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, adding 3 20g of ammonium metatungstate, as P 2 o 5 3.5g of phosphoric acid, 3.5g of magnesium nitrate solution as MgO to form TiO-containing 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 ...

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Abstract

The invention discloses a honeycomb-type vanadium-free denitrification catalyst for reducing the SO2 oxidation rate and a preparation method thereof. The preparation method comprises the following steps that a titanium source precursor is dissolved in acid to form a solution; a tungsten source precursor, a phosphorus source precursor and a magnesium source precursor are respectively dissolved to form a solution; the solutions are evenly mixed, a pH value is regulated to 7-12, precipitation and filtration are performed, then deionized water and a rare earth precursor solution are added, drying and calcination are performed directly after even mixing, and the mixture is grinded into powder; a solution prepared by an extrusion additive and the tungsten source precursor and a pore forming agent are added in the powder, water is added while stirring to form paste, then nano silica, glass fiber and a binder are added and are evenly mixed, and a honeycomb-type blank is extruded out by utilizing an extruding machine; the dried blank is firstly put in a silicon source precursor solution for impregnation, and a finished product is obtained after calcination. The prepared honeycomb-type vanadium-free denitrification catalyst overcomes the defects of active center imbalance and unstable activity of a denitrification catalyst in flue gas in the prior art.

Description

technical field [0001] The invention relates to a method for reducing SO 2 Oxidation rate honeycomb vanadium-free denitration catalyst and its preparation method, especially a denitration catalyst resistant to uneven deposition of heavy metals 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 stipulates tha...

Claims

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Application Information

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IPC IPC(8): B01J27/188B01J35/04B01J37/02B01J37/00B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J27/188B01J37/0018B01J37/0036B01J37/0201B01D2258/0283B01J2523/00B01J35/56B01J2523/22B01J2523/31B01J2523/41B01J2523/47B01J2523/51B01J2523/69B01J2523/74
Inventor 刘光利巫树锋贾媛媛杨岳唐中华王军张立基刘发强梁宝锋
Owner PETROCHINA CO LTD
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