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A kind of denitrification catalyst anti-heavy metal deposition and preparation method thereof

A denitration catalyst, anti-heavy metal technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the imbalance of active centers, instability, and easy deposition of heavy metals Activity and other issues, to achieve the effect of uniform dispersion, stable catalyst activity, and high catalyst performance

Active Publication Date: 2020-01-03
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 heavy metal deposition-resistant denitrification catalyst and its preparation method to overcome the defects of unbalanced active centers, heavy metal deposition and unstable activity of denitrification catalysts in the prior art

Method used

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  • A kind of denitrification catalyst anti-heavy metal deposition and preparation method thereof

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Embodiment 1

[0038] will contain TiO 2 100g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For a 35g / L solution, add MoO 3 A total of 3.5g of ammonium paramolybdate 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 the washed material is made of deionized water and 0.5g squash powder to make the water content For a 50% slurry, add V 2 o 5 A total of 0.9g 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 MoO 3 A total of 1.0 g of ammonium molybdate solution was used to make a slurry with a water content of 30%, and after stirring, 0.8 g of turnip powder was added, stirred for 40 min, sealed and left for 24 h, dried, and roasted at 620°C for 8 h to obtain a denitrification catalyst. The fresh catalyst obtained above an...

Embodiment 2

[0042] will contain TiO 2 100g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For 30g / L solution, add MoO 3 A total of 3.5g of ammonium molybdate solution was ultrasonically oscillated for 1.5h and then gradually added ammonia water to adjust the pH value to 10. After the precipitation was complete, filter and wash; For a 50% slurry, add V 2 o 5 A total of 0.9g 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 MoO 3 A total of 0.5g of ammonium molybdate solution was used to make a slurry with a water content of 35%, and after stirring, 0.6g of turnip powder was added, stirred for 30 minutes, sealed and left for 16 hours, dried, and roasted at 600°C to obtain a denitration catalyst. The fresh catalyst obtained above and the catalyst after high-temperature mixing with the catalytic cracking waste catalyst containing heavy...

Embodiment 3

[0046] will contain TiO 2 100g of metatitanic acid is dissolved in sulfuric acid solution to form TiO-containing 2 For 30g / L solution, add MoO 3 A total of 2.5g 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 the washed material is made of deionized water and 0.3g scallop powder with a water content of 45% slurry, add V 2 o 5 A total of 0.6g 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 MoO 3 A total of 0.8g of ammonium molybdate solution was prepared into a slurry with a water content of 30%. After stirring, 0.7g of scallop powder 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 after h...

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Abstract

The invention discloses a denitration catalyst with resistance to heavy metal deposition and a preparation method of the denitration catalyst. The denitration catalyst with the specific surface area being 40-120 m<2> / g contains 80%-98% by weight of titanium dioxide, 1%-15% by weight of molybdenum trioxide and 0.3%-5% by weight of vanadium pentoxide. The preparation method comprises the following steps: (1) a titanium source precursor is dissolved in acid; (2) a molybdenum source precursor is dissolved and mixed with the solution in step (1); (3) pH of the solution obtained in step (2) is regulated, and the solution is filtered; (4) sesbania powder and deionized water are added to a filter cake obtained in step (3), a vanadium source precursor solution is added, and the mixed solution is roasted; (5) the molybdenum source precursor solution is mixed with powder in step (4), the sesbania powder is added, the mixture is sealed, left to stand and roasted, and the denitration catalyst is formed. The prepared denitration catalyst has the advantages that heavy-metal oxide in flue gas can be prevented from depositing on the surface of the catalyst, adding quantity of active components in the catalyst can be reduced, and preparation cost of the catalyst is reduced.

Description

technical field [0001] The invention relates to a denitrification catalyst resistant to heavy metal deposition and a preparation method thereof, in particular to a denitrification catalyst resistant to heavy metal oxide deposition in flue gas and a preparation method thereof. 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 co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/28B01J2523/00B01J2523/47B01J2523/68B01J2523/55
Inventor 贾媛媛刘光利唐中华巫树锋李扬王军李晶蕊刘发强梁宝锋杨岳荣树茂
Owner PETROCHINA CO LTD
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