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

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...

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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 preparation of the powder is the same, the powder has not been specially treated, and the problem of high temperature aging resistance of the catalyst cannot be solved; the patent CN103908970 discloses an integral SCR honeycomb catalyst for diesel vehicle exhaust gas treatment and its preparation method, and introduces a SCR catalyst Technology for the preparation of washcoat materials, the composition of which is ZrO 2 -TiO 2 Composite oxide, the method is prepared by precipitation method, and the auxiliary active substance WO 3 Both the active material vanadium and the active material adopt the post-adding method, and the production cost is relatively high

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