Titanium tungsten silicon composite powder used for diesel vehicle/steamship tail gas SCR denitration, and preparation method thereof

A diesel vehicle, titanium-tungsten-silicon technology is applied in the field of titanium-tungsten-silicon composite powder for SCR denitration of diesel vehicle/ship exhaust gas and its preparation, which can solve the problem of high production cost, and achieve long service life, strong adsorption, and high temperature resistance. Effect

Active Publication Date: 2018-07-24
PANZHIHUA ZHENGYUAN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN101757907 discloses a preparation technology of a honeycomb SCR denitration catalyst containing tungsten-containing titanium dioxide powder, the component of which is TiO 2 -WO 3 Powder, but it is only suitable for flue gas denitrification of coal-fired power plants, not suitable for exhaust denitrification of mobile sources including diesel vehicles/ships; patent CN103769080 discloses a preparation method for diesel vehicle exhaust purification SCR catalyst and carrier coating material, Including TiO 2 -WO 3 Powder preparation technology, its preparation technology and common SCR catalyst carrier TiO 2 -WO 3 The preparati

Method used

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  • Titanium tungsten silicon composite powder used for diesel vehicle/steamship tail gas SCR denitration, and preparation method thereof
  • Titanium tungsten silicon composite powder used for diesel vehicle/steamship tail gas SCR denitration, and preparation method thereof

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Example Embodiment

[0030] Specifically, a titanium-tungsten-silicon composite powder for diesel vehicle / ship exhaust SCR denitration is prepared by the following method:

[0031] a. Beat and disperse metatitanic acid until the mass fraction of titanium dioxide is 22%-25%, add ammonia water to adjust the pH, stir evenly to obtain a slurry for use;

[0032] b. Beat and disperse metatitanic acid with a mass fraction of 18%-20% based on titanium dioxide, add ammonia water to adjust the pH, then add the tungsten source and the silicon source, and heat and maintain the masterbatch;

[0033] c. The slurry obtained in step a and the master batch obtained in step b are uniformly mixed and then filtered, the filter cake is dried and then calcined, and the calcined material is crushed to obtain titanium tungsten silicon composite powder for diesel vehicle / ship exhaust SCR denitration.

[0034] The mass concentration of the raw material metatitanic acid in the present invention is 25%-30%, its iron metatitanate cont...

Example Embodiment

[0050] Example 1

[0051] a. Weigh 10Kg metatitanic acid (according to TiO 2 Calculate), evenly divide into two parts, add one part to the reactor with stirring device, add deionized water, beat and disperse until the mass fraction of titanium dioxide is 23%, add ammonia water to adjust the pH to 7.93, stir evenly to obtain a slurry ,spare;

[0052] b. Add another portion to the reactor with stirring device, add deionized water, beating and dispersing until the mass fraction of titanium dioxide is 20%, adding ammonia to adjust the pH to 7.91, adding ammonium paratungstate (APT) 1.1 to the slurry kg, silica sol 1.1kg, heated to 75°C and kept for 2h. During the heating and keeping warm, ammonia water is added to maintain the pH of the system at 7.5-8.8 to obtain a masterbatch;

[0053] c. Mix the slurry and the masterbatch evenly, press and filter to obtain a block filter cake. After the filter cake is dried at 250°C for 2 hours, it enters the rotary kiln for calcination, at 350°C to ...

Example Embodiment

[0054] Example 2

[0055] a. Weigh 10Kg metatitanic acid (according to TiO 2 Calculate), evenly divide into two parts, add one part to the reactor with stirring device, add deionized water, beat and disperse until the mass fraction of titanium dioxide is 23%, add ammonia water to adjust the pH to 7.76, stir evenly to obtain a slurry ,spare;

[0056] b. Add another portion to a reactor with a stirring device, add deionized water, beating and dispersing until the mass fraction of titanium dioxide is 18%, adding ammonia to adjust the pH to 7.84, adding ammonium paratungstate (APT) 1.1 to the slurry kg, silica sol 0.52kg, heated to 75℃ and kept for 2h, during the heating and keeping warm, add ammonia water to keep the pH of the system at 7.5~8.8 to obtain the masterbatch;

[0057] c. Mix the slurry and the masterbatch evenly, press and filter to obtain a block filter cake. After the filter cake is dried at 250°C for 2 hours, it enters the rotary kiln for calcination, at 350°C to 380°C f...

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Abstract

The invention discloses a titanium tungsten silicon composite powder used for diesel vehicle/steamship tail gas SCR denitration, and a preparation method thereof, and belongs to the field of carrier coating material. The titanium tungsten silicon composite powder used for diesel vehicle/steamship tail gas SCR denitration is capable of avoiding defects of conventional SCR catalysts. The preparationmethod comprises following steps: metatitanic acid is subjected to beating dispersion, and ammoniacal liquor is added to adjust pH value so as to obtain a slurry; metatitanic acid is subjected to beating dispersion, ammoniacal liquor is added to adjust pH value, a tungsten source and a silicon source are added, and heating thermal insulation treatment is carried out so as to obtain a master batch; the slurry and the master batch are uniformly mixed, press filtration is carried out, and obtained filter cake is subjected to calcining, and crushing so as to obtain a finished product. According to the preparation method, raw material quality is controlled, ratio is adjusted, the corresponding preparation technology is adopted, so that the obtained titanium tungsten silicon composite powder isrelatively large in specific surface area, possesses high temperature aging resistance, is wide in catalytic temperature range, is high in nitrogen removal efficiency, low in drying cracking rate, and shedding rate, long in service life, and promising in application prospect.

Description

technical field [0001] The invention belongs to the field of carrier coating materials, and in particular relates to a titanium-tungsten-silicon composite powder for diesel vehicle / ship exhaust SCR denitrification and a preparation method thereof. Background technique [0002] Today, with the development of modern industry, people need an environment with fresh air, and PM2.5 is an important factor affecting the quality of air environment, such as coal-fired power plants / large boilers burning heavy oil, exhaust emissions from diesel vehicles / ships, etc. , are the sources of PM2.5; and with the development of my country's automobile industry and the increase of automobile ownership, the treatment technology of automobile exhaust has also attracted people's attention; the nitrogen oxides (NOx) in diesel vehicle / ship exhaust x ) is the main component in the treatment. Selective catalytic reduction (SCR) denitrification technology is not only widely used in the denitrification sy...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/94B01D53/56
CPCB01D53/9413B01D2258/012B01J23/002B01J23/30B01J2523/00B01J2523/41B01J2523/47B01J2523/69Y02T10/12Y02A50/20
Inventor 杜广平李洪智章强杨远君黄仁东秦永强
Owner PANZHIHUA ZHENGYUAN TECH
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