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Denitration catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of unbalanced active centers and low crushing strength, and achieve uniform dispersion and high pressure The effect of crushing strength and high catalyst performance

Active Publication Date: 2018-04-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a denitrification catalyst and its preparation method to overcome the defects of low crushing strength and unbalanced active centers in high-temperature flue gas in the prior art, and the catalyst of the present invention can resist flue gas The uneven deposition of vanadium oxide in the gas on its surface increases the strength of the catalyst, improves the network micropores, and improves the performance of the catalyst.

Method used

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  • Denitration catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] 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 22.5g of ammonium paratungstate solution, after ultrasonic vibration 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 4.5g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1.5h. After direct drying, it was roasted at 620°C for 8h; after roasting, the powder was mixed with WO 3 A total of 7.5g of ammonium metatungstate solution was made into a slurry with a water content of 30%, and after stirring, 4g of citric acid-squat powder compound agent was added, stirred for 40min, sealed and left for 24h, dried, and roasted at 620°C for 8h to obtain a denitrification catalyst . The crushing strength of the catalyst is 26.7kg / cm 2 , spe...

Embodiment 2

[0043] 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 22.5g of ammonium paratungstate solution, mechanically stirred for 1.5h, then gradually added ammonia water to adjust the pH value to 10, after the precipitation was complete, filtered and washed; then the washed material was made into a slurry with a water content of 50% with deionized water, and added with V 2 o 5 A total of 4.5g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1.5h. After direct drying, it was roasted at 600°C for 8h; after roasting, the powder was mixed with WO 3 A total of 5g of ammonium metatungstate solution was used to make a slurry with a water content of 35%. After stirring, 3.5g of citric acid-seed green powder compound agent was added, stirred for 30min, sealed and left for 16h, dried, and roasted at 600°C to obtain a denitrification catalyst. The fresh catalyst obtained ...

Embodiment 3

[0047] will contain TiO 2 500g of metatitanic acid 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 1 hour, 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 45%, and add V 2 o 5 A total of 5g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1h. After direct drying, it was roasted at 550°C for 6h; after roasting, the powder was mixed with WO 3 A total of 5g of ammonium metatungstate solution was used to make a slurry with a water content of 30%. After stirring, 3g of citric acid-seed turnip powder compound agent was added, stirred for 30min, sealed and left for 20h, dried, and roasted at 550°C to obtain a denitrification catalyst. The fresh catalyst obtained above and the catalyst mixed with the catalyt...

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Abstract

The invention discloses a denitration catalyst and a preparation method thereof. The preparation method comprises steps as follows: (1) a titanium source precursor is dissolved to form a solution; (2), a tungsten source precursor is dissolved and mixed with the solution obtained in the step (1) uniformly; (3) the pH value of the solution obtained after uniform mixing in the step (2) is adjusted tobe alkaline, precipitation, filtration and washing are performed, and a filter cake is obtained; (4) deionized water is added to the filter cake obtained in the step (3), the filter cake is blended to be slurry, a vanadium precursor solution is added, the mixture is mixed uniformly and directly dried and roasted, and powder is formed; (5) the solution formed by the tungsten source precursor is mixed with the powder obtained in the step (4) to form slurry, a citric acid-sesbania powder compound is added after the slurry is stirred, secondary stirring is performed, the mixture is sealed, left to stand, dried and roasted, and the denitration catalyst is formed. The prepared denitration catalyst can resist non-uniform deposition of vanadium oxide in flue gas on the surface and improve the intensity, mesh micropores and performance of the catalyst.

Description

technical field [0001] The invention relates to a flue gas 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, 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-fired boilers newly built, expanded and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/30B01J2523/00B01J2523/47B01J2523/55B01J2523/69
Inventor 刘光利杨岳李扬贾媛媛荣树茂巫树锋梁宝锋王立蓉唐中华王军李晶蕊周霞
Owner PETROCHINA CO LTD
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