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Preparation method of denitrification catalyst

A technology of denitrification catalyst and template agent, which is applied in the direction of catalyst carrier, chemical instrument and method, physical/chemical process catalyst, etc. It can solve the problems of affecting the mechanical strength of the catalyst coating and the difficulty of preparation technology, so as to improve the resistance to water vapor poisoning Ability, weakening interaction, life-prolonging effect

Active Publication Date: 2019-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, further increasing the number of macropores in the coating can improve the reaction space of the catalyst and the ability to resist fly ash and salt poisoning, and the increase in the number of macropores will inevitably affect the mechanical strength of the catalyst coating. It can be seen that the macropores There is an insoluble contradiction between the quantity and the mechanical strength of the coating, and it is difficult for conventional preparation techniques to balance these two problems

Method used

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  • Preparation method of denitrification catalyst
  • Preparation method of denitrification catalyst
  • Preparation method of denitrification catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Under the action of ultrasound (the energy density of ultrasonic dispersion is 0.6kW / L, the ultrasonic dispersion temperature is 40°C, and the ultrasonic dispersion time is 1 hour), disperse the carbon black powder in water, then adjust the pH to 10 with ammonia water, add Ethyl orthosilicate and tetrapropylammonium bromide, stirred evenly, reacted for 3 hours, filtered, dried at 50°C for 2 hours on the solid phase, and dried to obtain pretreated carbon black powder, in which ethyl orthosilicate was replaced by SiO 2 The mass ratio of meter to carbon black powder is 2:1, and the mass ratio of tetrapropylammonium bromide to carbon black powder is 1:2;

[0041] (2) Mix the carbon black powder and aluminum sol obtained in step (1) evenly according to a mass ratio of 1:8 to obtain a coating slurry;

[0042] (3) Immerse the pretreated cordierite honeycomb ceramic substrate in the coating slurry for 10 minutes, take it out, blow off the residual liquid, and put the materi...

Embodiment 2

[0045] (1) Under the action of ultrasound (the energy density of ultrasonic dispersion is 1kW / L, the ultrasonic dispersion temperature is 50°C, and the ultrasonic dispersion time is 2.5 hours), disperse the carbon black powder in water, then adjust the pH to 8 with ammonia water, and add positive Ethyl silicate and tetrapropylammonium bromide, stirred evenly, reacted for 4 hours, filtered, dried at 50°C for 3 hours on the solid phase, and dried to obtain pretreated carbon black powder. 2 The mass ratio of meter to carbon black powder is 3:1, and the mass ratio of tetrapropylammonium bromide to carbon black powder is 1:1.5;

[0046] (2) Mix the carbon black powder and aluminum sol obtained in step (1) evenly according to a mass ratio of 1:5 to obtain a coating slurry;

[0047] (3) Immerse the pretreated cordierite honeycomb ceramic substrate in the coating slurry for 30 minutes, take it out, blow off the residual liquid, put the material in the reaction kettle for hydrothermal ...

Embodiment 3

[0050] (1) Under the action of ultrasound (the energy density of ultrasonic dispersion is 2kW / L, the ultrasonic dispersion temperature is 55°C, and the ultrasonic dispersion time is 4 hours), disperse the carbon black powder in water, then adjust the pH to 10 with ammonia water, add positive Ethyl silicate and tetrapropylammonium bromide, stirred evenly, reacted for 5 hours, filtered, dried at 60°C for 2 hours on the solid phase, and dried to obtain pretreated carbon black powder, in which ethyl orthosilicate was replaced by SiO 2 The mass ratio of meter to carbon black powder is 2:1, and the mass ratio of tetrapropylammonium bromide to carbon black powder is 1:1;

[0051] (2) Mix the carbon black powder and aluminum sol obtained in step (1) evenly according to a mass ratio of 1:3 to obtain a coating slurry;

[0052] (3) Immerse the pretreated cordierite honeycomb ceramic substrate in the coating slurry for 45 minutes, take it out, blow off the residual liquid, put the materia...

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Abstract

The invention discloses a preparation method of a denitration catalyst, which includes the following contents: (1) Disperse carbon black powder in water under the action of ultrasound, adjust the pH value, add silicon source and template agent, stir evenly, react for a period of time, and solidify The liquid is separated, and the solid phase is dried to obtain pretreated carbon black powder; (2) Mix the pretreated carbon black powder and aluminum sol evenly to obtain a coating slurry; (3) Immerse the pretreated cordierite honeycomb ceramic matrix After the coating slurry is processed, take it out, blow off the residual liquid, perform hydrothermal treatment, drying and roasting to obtain a cordierite honeycomb ceramic matrix supporting the coating; (4) Impregnate the product obtained in step (3) with an impregnating liquid containing active components. The carrier is dried and roasted to obtain the final product. The denitrification catalyst coating prepared by the method of the present invention contains many macropores and can ensure a certain mechanical strength. It has good denitrification activity, stability and anti-toxicity properties. The preparation process is simple and is suitable for industrial applications.

Description

technical field [0001] The invention relates to a preparation method of a denitration catalyst. Background technique [0002] NO x It is the main pollutant that forms acid rain, photochemical smog and atmospheric ozone layer destruction. During the "Twelfth Five-Year Plan" period, it has been clearly requested that NO x Realize total control. The "Emission Standards of Air Pollutants for Thermal Power Plants" implemented in 2012 requires NO x Emission limit is 100mg / m 3 . Therefore, how to effectively remove nitrogen oxides in flue gas has become an urgent problem to be solved. In the current denitrification technology, selective catalytic reduction (SCR) uses reducing agents such as ammonia to selectively reduce NO in exhaust gas through the action of catalysts. x Reductive conversion to N that is harmless to the atmosphere 2 and H 2 O, with the characteristics of good selectivity and high efficiency, has become the most widely used flue gas denitrification technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/889B01J21/18B01J32/00B01D53/86B01D53/56
CPCB01D53/8628B01J21/18B01J23/34B01J23/8892B01D2258/0283B01J35/56
Inventor 王学海刘淑鹤程明珠王宽岭陈高升
Owner CHINA PETROLEUM & CHEM CORP
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