Honeycomb denitration catalyst with increased specific surface area and preparation method

A denitration catalyst, specific surface area technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of unbalanced active centers, etc. Crush strength, the effect of improving efficiency

Active Publication Date: 2017-11-07
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a honeycomb denitrification catalyst with increased specific surface area and its preparation method, so as to overcome the defect that the active center of the denitrification catalyst in the prior art is unbal

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  • Honeycomb denitration catalyst with increased specific surface area and preparation method

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Example Embodiment

[0044] Example 1:

[0045] Add 20g of activated alumina to water, make a slurry to form a slurry, and add TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 It is a 35g / L solution with WO 3 A total of 10g of ammonium paratungstate solution, after ultrasonic vibration for 2h, gradually add ammonia water to adjust the pH to 9.5, after the precipitation is complete, filter and wash; then use deionized water to make the washed material into a slurry with a water content of 50%, and add V 2 O 5 5g of ammonium metavanadate solution, ultrasonic vibration for 1.5h while stirring, after direct drying, roasting at 620℃ for 6h; after roasting, the powder is mixed with MoO 3 A total of 10g of ammonium molybdate was made into a slurry with 30% water. After stirring, 4g of sesame powder was added, stirred for 40min, sealed and allowed to stand for 24h, extruded into a honeycomb shape, dried and then coated with 15g of nano-scale tungsten oxide. After calcination a...

Example Embodiment

[0048] Example 2

[0049] Add 40g of activated alumina to water, make a slurry to form a slurry, and add TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 40g / L solution, add WO 3 15g of ammonium paratungstate solution, after ultrasonic vibration for 1h, gradually add ammonia water to adjust the pH to 9.0. After precipitation is complete, filter and wash; then use deionized water to make a slurry with 50% water content and add V 2 O 5 20g of ammonium metavanadate solution, ultrasonic vibration for 1.5h while stirring, after direct drying, roasting at 400℃ for 6h; after roasting, the powder is mixed with MoO 3 A total of 3g of ammonium molybdate was made into a slurry with 30% water. After stirring, 4g of sesame powder was added, stirred for 40min, sealed and allowed to stand for 10h, extruded into a honeycomb shape, dried, and then coated with 25g of nano-grade tungsten oxide. After calcination at ℃ for 8h, a denitration catalyst is obtained. The f...

Example Embodiment

[0052] Example 3

[0053] Add 20g of activated alumina into water, make a slurry to form a slurry, and add TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 40g / L solution, add WO 3 A total of 12.5g of ammonium paratungstate solution, after ultrasonic vibration for 3h, gradually add ammonia water to adjust the pH to 10.5, after the precipitation is complete, filter and wash; then use deionized water to make the washed material into a slurry with a water content of 35%. V 2 O 5 30g of ammonium metavanadate solution, ultrasonic vibration for 1.5h while stirring, after direct drying, calcination at 400℃ for 6h; after calcination, the powder is mixed with MoO 3 A total of 3g of ammonium molybdate was made into a slurry with 30% water, 4g of sesame powder was added after stirring, stirred for 40min, sealed and allowed to stand for 10h, extruded into a honeycomb shape, dried and coated with 25g of nanoscale tungsten oxide, After calcination at ℃ for 8h, ...

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Abstract

The invention discloses a honeycomb denitration catalyst with increased specific surface area and a preparation method. The preparation method comprises steps as follows: (1) beating active alumina; (2) dissolving a titanium source precursor; (3) dissolving a tungsten source precursor and mixing the dissolved tungsten source precursor with the materials in the steps (1) and (2); (4) adjusting pH of the material evenly mixed in the step (3) to 8-13, and performing precipitation, filtering and washing to obtain a filter cake; (5) adding water to the filter cake obtained in the step (4), mixing the filter cake into a slurry state, adding a vanadium source precursor solution, and performing mixing, drying and roasting to form powder; (6) mixing a solution formed by a molybdenum source precursor with the powder in the step (5) into a slurry, stirring the mixture, adding a pore-forming agent, performing secondary stirring, allowing the mixture to stand, squeezing the mixture into a honeycomb shape, performing drying, and coating the surface with nano-tungsten oxide for roasting to obtain the denitration catalyst. The prepared denitration catalyst has the advantages that the specific surface area can be increased, and non-uniform deposition of heavy metals in flue gas on the surface of the catalyst is prevented.

Description

technical field [0001] The invention relates to a honeycomb denitration catalyst with increased specific surface area 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, which 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-f...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J35/10B01J35/04B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/30B01J35/04B01J35/1019B01J2523/00B01J2523/31B01J2523/55B01J2523/69B01J2523/47B01J2523/68
Inventor 刘光利杨岳贾媛媛荣树茂李杨巫树锋梁宝锋王立蓉唐中华王军
Owner PETROCHINA CO LTD
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