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A honeycomb denitration catalyst with increased specific surface area and preparation method thereof

A technology of denitrification catalyst and specific surface area, applied in chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve problems such as active center imbalance, achieve more active sites, ensure catalyst performance, The effect of high catalyst performance

Active Publication Date: 2020-10-13
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 unbalanced in the high-temperature flue gas, and the catalyst of the present invention can resist smoke The uneven deposition of vanadium oxides on the surface of the channel gas increases the specific surface area of ​​the catalyst and improves the performance of the catalyst.

Method used

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  • A honeycomb denitration catalyst with increased specific surface area and preparation method thereof

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Embodiment 1

[0045] Add 20g of activated alumina to water, beat to form a slurry, and will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For a 35g / L solution, add WO 3 Measure 10g of ammonium paratungstate solution, ultrasonically oscillate for 2 hours, then 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 5g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1.5h. After direct drying, it was roasted at 620°C for 6h; after roasting, the powder was mixed with MoO 3 A total of 10g of ammonium molybdate was made into a slurry with a water content of 30%. After stirring, 4g of scallop powder was added, stirred for 40min, sealed and left for 24h, extruded into a honeycomb shape, dried, and then coated with 15g of nano-scale tungsten oxide. The denitration cata...

Embodiment 2

[0049] Add 40g of activated alumina to water, beating to form a slurry, and will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For 40g / L solution, add WO 3 A total of 15g of ammonium paratungstate solution, after ultrasonic vibration for 1 hour, gradually add ammonia water to adjust the pH value to 9.0, 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 20g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1.5h. After direct drying, it was roasted at 400°C for 6h; after roasting, the powder was mixed with MoO 3 A total of 3g of ammonium molybdate was made into a slurry with a water content of 30%. After stirring, 4g of scallop 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-sized tungsten oxide. The deni...

Embodiment 3

[0053] Add 20g of activated alumina to water, beating to form a slurry, and will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For 40g / L solution, add WO 3 A total of 12.5g of ammonium paratungstate solution, after ultrasonic vibration for 3 hours, gradually add ammonia water to adjust the pH value to 10.5, after the precipitation is complete, filter and wash; then use deionized water to make a slurry with a water content of 35%, add V 2 o 5 A total of 30g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1.5h. After direct drying, it was roasted at 400°C for 6h; after roasting, the powder was mixed with MoO 3 A total of 3g of ammonium molybdate was made into a slurry with a water content of 30%. After stirring, 4g of scallop powder was added, stirred for 40 minutes, sealed and left for 10 hours, extruded into a honeycomb shape, dried, and then coated with 25g of nano-sized tungsten oxide. The denit...

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Abstract

The invention discloses a honeycomb denitration catalyst with increased specific surface area and a preparation method. The steps are as follows: (1) beating activated alumina; (2) dissolving titanium source precursor; (3) dissolving tungsten source precursor , and mix with the materials in steps (1) and (2); (4) Mix the materials in step (3) evenly and adjust the pH value to 8-13, precipitate, filter, and wash to obtain a filter cake; (5) Mix the materials in step (3) evenly to obtain a filter cake. 4) Add water to the obtained filter cake to make a slurry, add the vanadium source precursor solution, mix, dry and roast to form a powder; (6) Combine the solution formed by the molybdenum source precursor and the powder in step (5) Mix it into a slurry. After stirring, add a pore-forming agent. After stirring twice, let it stand and squeeze it into a honeycomb shape. After drying, the surface is coated with nanoscale tungsten oxide and roasted to obtain a denitration catalyst. The denitrification catalyst prepared by the invention can not only increase the specific surface area of ​​the catalyst, but also resist the uneven deposition of heavy metals in the flue gas on its surface.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J35/10B01J35/04B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/30B01D2258/0283B01J2523/00B01J35/56B01J35/615B01J2523/31B01J2523/55B01J2523/69B01J2523/47B01J2523/68
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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