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Cellular denitrification catalyst and preparation method thereof

A denitrification catalyst, honeycomb technology, applied in the direction of chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of unbalanced active centers, unstable activity, etc., to achieve increased density, The effect of stable catalyst activity and tight connection

Inactive Publication Date: 2017-09-05
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 denitration catalyst and its preparation method to overcome the defects of unbalanced active center and unstable activity of denitration catalyst in the flue gas in the prior art

Method used

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  • Cellular denitrification catalyst and preparation method thereof

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Effect test

Embodiment 1

[0059] 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 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, 17.5g of glass after stirring Fiber, 4g carboxymethyl cellulose, stirred for 40min, sealed and left...

Embodiment 2

[0063] No pore-forming agent polyethylene oxide is added, and the rest are the same as in Example 2, about to 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 dioxi...

Embodiment 3

[0067] 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 cellular denitrification catalyst and a preparation method thereof. The catalyst preparation method comprises the following steps: dissolving a titanium source precursor in an acid to form a solution; respectively dissolving a molybdenum source precursor and a rare earth precursor to form solutions; uniformly mixing the above solutions, regulating the pH value to 7-12, and performing precipitation and filtration; then adding deionized water to form a pulp through blending; adding a vanadium source precursor solution, performing uniform mixing, and then directly performing drying, roasting and powder grinding; then adding an extrusion aid, the molybdenum source precursor solution and a pore forming agent into the powder, adding water with stirring to form a paste through blending, and regulating the pH value to alkaline; then adding nano silicon dioxide, glass fibers and an adhesive, and performing uniform mixing; and conducting extruding through an extruder to obtain a cellular blank, and performing drying and roasting to obtain the finished product. The cellular denitrification catalyst prepared by the preparation method disclosed by the invention can overcome the defects of the denitrification catalyst in the prior art, such as active center imbalance and unstable activity in flue gas.

Description

technical field [0001] The invention relates to a honeycomb denitration catalyst and a preparation method thereof, in particular to a denitration catalyst resistant to uneven deposition of vanadium 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 newly built, exp...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/28B01D2258/0283B01J2523/00B01J35/56B01J35/61B01J2523/47B01J2523/68B01J2523/55B01J2523/74B01J2523/31B01J2523/41
Inventor 巫树锋贾媛媛唐中华卜晓光张勇刘光利王军杨岳梁宝锋周霞
Owner PETROCHINA CO LTD
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