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Preparation method of honeycomb denitration catalyst with improved specific surface area

A technology of denitrification catalyst and specific surface area, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problem of active center imbalance, achieve improved efficiency, stable catalyst activity, and increase strength Effect

Active Publication Date: 2017-08-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a method for preparing a honeycomb denitrification catalyst with increased specific surface area 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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  • Preparation method of honeycomb denitration catalyst with improved specific surface area

Examples

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Effect test

Embodiment 1

[0048] Add 20g of coconut shell activated carbon into the glucose solution, mix well and 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 in a nitrogen atmosphere; after roasting, the powder was mixed with MoO 3 A total of 10g of ammonium molybdate was formulated 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, an...

Embodiment 2

[0052] Add 15g of coconut shell activated carbon into the glucose solution, mix well and 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 A total of 20g of ammonium paratungstate solution, after mechanical stirring for 2 hours, 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 10g of ammonium metavanadate solution was stirred mechanically for 1.5h, and after direct drying, it was roasted at 500°C for 6h in a nitrogen atmosphere; after roasting, the powder was mixed with MoO 3 A total of 2.5g of ammonium molybdate was formulated into a slurry with a water content of 30%. After stirring, 3g of scallop powder was added, stirred for 40min, sealed and left for 10h, extruded into a honeycomb shape, dried, and then coate...

Embodiment 3

[0056] Add 20g of coconut shell activated carbon into the glucose solution, mix well and 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 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 in a nitrogen atmosphere; after roasting, the powder was mixed with MoO 3 A total of 3g of ammonium molybdate was formulated into a slurry with a water content of 30%. After stirring, 4g of safflower powder was added, stirred for 40min, sealed and left for 10h, extruded into a honeycomb shape, dried, and...

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Abstract

The invention discloses a preparation method of a honeycomb denitration catalyst with an improved specific surface area, and the preparation method comprises the following steps: (1) mixing and beating activated carbon and a sugar solution; (2) dissolving a titanium-source precursor; (3) dissolving a tungsten-source precursor, and mixing the tungsten-source precursor with the materials in the steps (1) and (2); (4) adjusting pH value of the mixed material in the step (3) to 8-13, precipitating, filtering and washing to obtain a filter cake; (5) regulating the filter cake in the step (4) to paste, adding a vanadium-source precursor solution, mixing, drying, under the protection of an inert gas baking to form powder; and (6) mixing a molybdenum-source precursor solution with the powder in the step (5) into paste, stirring, adding a pore forming agent, secondarily stirring, standing, extruding into a honeycomb shape, drying, coating surface with nano tungsten oxide, baking in an inert gas to obtain the catalyst. The specific surface area of the can be increased, uneven deposition of heavy metals on the catalyst in the flue gas can be resisted.

Description

technical field [0001] The invention relates to a preparation method of a honeycomb denitration catalyst with increased specific surface area, in particular to a preparation method of a denitration catalyst resistant to uneven deposition of vanadium in flue gas. 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 boile...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/10B01D53/86B01D53/56B01J37/04B01J37/08
CPCB01D53/8628B01J23/002B01J23/30B01J37/04B01J37/082B01D2258/0283B01J2523/00B01J35/615B01J2523/47B01J2523/55B01J2523/68B01J2523/69
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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