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Honeycomb denitration catalyst capable of lowering oxidation rate of SO2 and preparation method thereof

A denitrification catalyst, honeycomb technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problems of unstable activity, high oxidation rate, unbalanced active center of denitrification catalyst, etc. , to achieve the effect of stable catalyst activity, uniform dispersion and increased strength

Inactive Publication Date: 2017-09-15
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 kind of reducing SO 2 Oxidation rate honeycomb denitrification catalyst and preparation method thereof, to overcome the unbalanced active center and SO 2 Defects of high oxidation rate and unstable activity

Method used

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  • Honeycomb denitration catalyst capable of lowering oxidation rate of SO2 and preparation method thereof

Examples

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Effect test

Embodiment 1

[0062] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 22.5g of ammonium molybdate, as CeO 2 Total 14g of rare earth 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 count 12.5g 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, 17.5g of glass after stirring Fiber, 4g carboxymethyl cellulose, stirred for 40min, sealed and left for 24...

Embodiment 2

[0066] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 22.5g of ammonium molybdate, as CeO 2 A total of 12.5g of rare earth 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 24h, th...

Embodiment 3

[0070] will contain TiO 2 500g of titanyl sulfate is dissolved in the sulfuric acid solution, and the 3 20g of ammonium molybdate, as CeO 2 A total of 10g of rare earth solution to form a 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 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...

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Abstract

The invention discloses a honeycomb denitration catalyst capable of lowering the oxidation rate of SO2 and a preparation method thereof. The preparation method comprises the following steps: dissolving a titanium-source precursor in an acid to form a solution; separately dissolving a molybdenum-source precursor and a rare-earth precursor to form solutions; uniformly mixing the above solutions, adjusting the pH value of the mixed solution to 7 to 12, successively carrying out precipitation and filtering, then adding deionized water, carrying out blending to form slurry, adding a vanadium-source precursor solution, carrying out uniform mixing and then directly carrying out drying, roasting and grinding to obtain powder; adding an extrusion aid, the solution formed by the molybdenum-source precursor and a pore forming agent, adding water under stirring to obtain paste, then adding nanometer silica, glass fibers and a binder, carrying out uniform mixing and then carrying out extrusion with an extruder to obtain a honeycomb green body; and drying the honeycomb green body, dipping the honeycomb green body in a solution of a silicon-source precursor and carrying out roasting so as to obtain the finished honeycomb denitration catalyst. The honeycomb denitration catalyst provided by the invention can overcome the defects that conventional denitration catalysts have imbalanced active centers in flue gas, high oxidation rates of SO2 and instable activity.

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): B01J23/28B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/28B01J2523/00B01J35/56B01J2523/47B01J2523/68B01J2523/55B01J2523/3712
Inventor 贾媛媛张立基巫树锋刘光利杨会芳唐中华杨岳江岩笪敏峰王军
Owner PETROCHINA CO LTD
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