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Denitration catalyst with wide temperature window and preparation method of denitration catalyst

A denitrification catalyst and wide temperature technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of unbalanced active centers, narrow temperature window, unstable activity, etc., to achieve The effect of increasing crushing strength, uniform dispersion and stable catalyst activity

Active Publication Date: 2018-04-17
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 denitrification catalyst with a wide temperature window and its preparation method, so as to overcome the defects of unbalanced active center, narrow temperature window and unstable activity of the denitrification catalyst in the prior art.

Method used

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  • Denitration catalyst with wide temperature window and preparation method of denitration catalyst

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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 35g / L solution, add MoO 3 A total of 22.5g of ammonium paramolybdate 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% , Join with V 2 O 5 4.5g of ammonium metavanadate solution, ultrasonic vibration for 1.5h while stirring, after direct drying, roasting at 620℃ for 8h; after roasting, the powder is mixed with MoO 3 A total of 7.5 g of ammonium molybdate solution was made into a slurry with 30% water, 4 g of polyethylene oxide was added after stirring, and the mixture was stirred for 40 minutes, sealed and allowed to stand for 24 hours, dried, and calcined at 620° C. for 8 hours to obtain a denitration catalyst. The fresh catalyst obtained above and the catalyst after being mixed with ...

Embodiment 2

[0043] Will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 30g / L solution, add MoO 3 A total of 22.5g of ammonium molybdate solution, after ultrasonic vibration 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 the washed material into a slurry with a water content of 50% , Join with V 2 O 5 4.5g of ammonium metavanadate solution, ultrasonic vibration for 1.5h while stirring, after direct drying, roasting at 600℃ for 8h; after roasting, the powder is mixed with MoO 3 A total of 5 g of ammonium molybdate solution was made into a slurry containing 35% water, and 3.5 g of polyethylene oxide was added after stirring, stirred for 30 minutes, sealed and allowed to stand for 16 hours, dried, and calcined at 600°C to obtain a denitration catalyst. The fresh catalyst obtained above and the catalyst after being mixed with the waste catalyst co...

Embodiment 3

[0047] Will contain TiO 2 500g of metatitanic acid is dissolved in sulfuric acid solution to form TiO 2 30g / L solution, add MoO 3 A total of 20g of ammonium molybdate solution, after ultrasonic vibration for 1h, 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 45% water content after washing. Take V 2 O 5 A total of 5g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1h. After direct drying, it was calcined at 550℃ for 6h; after calcining, the powder was mixed with MoO 3 A total of 5 g of ammonium molybdate solution was made into a slurry with 30% water, and 3 g of polyethylene oxide was added after stirring, stirred for 30 minutes, sealed and allowed to stand for 20 hours, dried, and calcined at 550°C to obtain a denitration catalyst. The fresh catalyst obtained above and the catalyst after being mixed with the waste catalyst containing va...

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Abstract

The invention discloses a denitration catalyst with a wide temperature window and a preparation method of the denitration catalyst. The preparation method comprises the following steps: (1) a titaniumsource precursor is dissolved in acid, and a solution I is formed; (2) a molybdenum source precursor is dissolved to form a solution II, and the solution II is mixed with the solution I in step (1);(3) pH of the uniformly mixed solution obtained in step (2) is regulated to alkaline, precipitation, filtering and washing are performed, and a filter cake is obtained; (4) deionized water is added tothe filter cake obtained in step (3), the mixture is regulated into paste, a vanadium source precursor solution is added, the materials are uniformly mixed and directly dried and roasted, and powderis formed; (5) the molybdenum source precursor solution is mixed with the powder in step (4) into paste, the paste is stirred, a pore forming assistant is added, secondary stirring is performed, the mixture is sealed, left to stand, dried and roasted, and the denitration catalyst is formed. The prepared denitration catalyst has the advantages that vanadium oxide in flue gas can be prevented from non-uniformly depositing on the surface of the catalyst, and higher catalytic performance can be guaranteed in a wider reaction temperature range.

Description

Technical field [0001] The invention relates to a flue gas denitration catalyst with a wide temperature window and a preparation method thereof, in particular to a denitration catalyst which resists uneven deposition of vanadium in flue gas and a preparation method thereof, and belongs to the technical field of inorganic new materials. Background technique [0002] Nitrogen oxides (NO x ) Is one of the main air pollutants, and emission requirements are becoming stricter. my country's "Twelfth Five-Year" Comprehensive Work Plan for Energy Conservation and Emission Reduction stipulates that by 2015, the total national nitrogen oxide emissions will be reduced by 10% compared with 2010. The GB13223-2001 "Emission Standard of Air Pollutants for Thermal Power Plants" promulgated by the Ministry of Environmental Protection in September 2011 set stricter requirements on the NOx emission concentration of thermal power plants: it stipulates that the new, expanded, and renovated coal-fired ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/28B01D2258/0283B01J2523/00B01J35/60B01J2523/47B01J2523/55B01J2523/68
Inventor 巫树锋刘光利贾媛媛王军唐中华李扬李晶蕊刘发强梁宝锋杨岳荣树茂
Owner PETROCHINA CO LTD
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