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Honeycomb flue gas denitrification catalyst capable of reducing activation temperature and SO2 oxidation rate and preparation method thereof

A denitration catalyst, honeycomb technology, applied in the field of denitration catalyst and its preparation that resists uneven deposition of heavy metals in flue gas, can solve the problems of unbalanced active centers, poor anti-poisoning, unstable activity, etc., to achieve uniform dispersion, The effect of stable catalyst activity and resistance to uneven deposition

Inactive Publication Date: 2017-10-13
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a method to reduce the activation temperature and SO 2 Oxidation rate honeycomb flue gas denitrification catalyst and preparation method thereof, to overcome the unbalanced active center, SO 2 Defects of high oxidation rate, poor anti-poisoning and unstable activity

Method used

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  • Honeycomb flue gas denitrification catalyst capable of reducing activation temperature and SO2 oxidation rate and preparation method thereof
  • Honeycomb flue gas denitrification catalyst capable of reducing activation temperature and SO2 oxidation rate and preparation method thereof

Examples

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Effect test

Embodiment 1

[0063] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 22.5g of ammonium molybdate, as P 2 o 5 A total of 4.5g of phosphoric acid 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% from the washed material, and add V 2 o 5 A total of 12.5g of ammonium metavanadate solution, stirred for 1.5h, dried, roasted at 550°C for 8h, and then ground into a powder with a particle size of less than 20μm; the powder was mixed with MoO 3 A total of 7.5g of ammonium molybdate, 4g of stearic acid, 3g of polyethylene oxide and deionized water are used to make a paste with a water content of 30%, adjust the pH value to 8.5 with ammonia water, add 5g of nano silicon dioxide and 17.5g of glass after stirring Fiber, 4g carboxymethyl cel...

Embodiment 2

[0067] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 22.5g of ammonium molybdate, as P 2 o 5 A total of 4.0g of phosphoric acid 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 10g of ammonium metavanadate solution, stirred for 1.5h, dried, roasted at 550°C for 8h, and then ground into a powder with a particle size of less than 30μm; the powder was mixed with MoO 3 The ammonium molybdate of 7.5g, 3.5g stearic acid, 3.5g polyoxyethylene and deionized water are made the paste body containing water 32%, adjust pH value to 8.0 with ammoniacal liquor, add 4.5g nano silicon dioxide, 17.5g glass fiber, 4g carboxymethyl cellulose, stir for 40min, seal and let stand for ...

Embodiment 3

[0071] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 20g of ammonium molybdate, as P 2 o 5 A total of 3.5g of phosphoric acid 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 9g of ammonium metavanadate solution, stirred for 1.0h, dried, roasted at 550°C for 8h, and then ground into a powder with a particle size of less than 15μm; the powder was mixed with MoO 3 The ammonium molybdate of 5g, 3.0g stearic acid, 3.0g polyethylene oxide and deionized water are made into a paste with a water content of 28%, and the pH value is adjusted to 8.2 with ammonia water, and after stirring, add 3.5g nano silicon dioxide, 22.5 g glass fiber, 3g carboxymethyl cellulose, stir for 40min, seal and let sta...

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Abstract

A preparation method of a honeycomb flue gas denitrification catalyst capable of reducing activation temperature and SO2 oxidation rate comprises the following steps: dissolving a titanium source precursor into acid to form a solution; dissolving a molybdenum source precursor and a phosphorus source precursor to form solutions; uniformly mixing the solutions, adjusting the pH value to 7-12, precipitating, filtering, then adding deionized water, a vanadium source precursor solution, uniformly mixing, directly drying, roasting, and grinding into powder; adding an extrusion aid, the solution formed by the molybdenum source precursor and a pore-forming agent into the powder, adding water while stirring, blending into a paste, then adding nanometer silicon dioxide, glass fiber and a bonding agent, uniformly mixing, extruding into a honeycomb blank by using an extruder, impregnating the dried blank into a silicon source precursor solution, and roasting to obtain a finished product. The invention aims to overcome the defects that in the prior art, the denitrification catalyst is unbalanced in active centers in flue gas, high in SO2 oxidation rate and poor in poisoning resistance.

Description

technical field [0001] The invention relates to a method for reducing activation temperature and SO 2 Oxidation rate honeycomb flue gas denitrification catalyst and its preparation method, especially a denitrification 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 p...

Claims

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Application Information

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IPC IPC(8): B01J27/199B01J35/10B01J37/02B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01J27/199B01J37/0009B01J37/0201B01J37/08B01D2258/0283B01J35/613B01J35/615
Inventor 贾媛媛巫树锋刘光利唐中华王军杨岳梁宝锋李晶蕊李常青谷丽芬
Owner PETROCHINA CO LTD
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