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Coating type catalyst composition, catalytic filter tube and preparation method thereof

A catalyst and coating-type technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as blowing off, large air flow, and difficult bonding of catalyst slurry to achieve low filtration resistance , High catalytic efficiency, increase the effect of catalytic removal of nitrogen oxides

Active Publication Date: 2021-09-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult for the above-mentioned catalyst slurry to be firmly bonded to the ceramic, and the air flow is too large during dust removal and injection, which may cause it to blow off

Method used

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  • Coating type catalyst composition, catalytic filter tube and preparation method thereof
  • Coating type catalyst composition, catalytic filter tube and preparation method thereof
  • Coating type catalyst composition, catalytic filter tube and preparation method thereof

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preparation example Construction

[0104] The second aspect of the present invention provides a method for preparing the coated catalyst composition according to the present invention, comprising the steps of mixing and ball milling the components of the coated catalyst composition.

[0105] In some specific embodiments, the preparation method includes the following steps:

[0106] dissolving the catalytically active component and the catalytic assistant in water, and adjusting the pH value with a pH regulator to obtain a precursor solution;

[0107] adding a dispersant, a defoamer and a binder to the precursor solution to obtain a premix;

[0108] adding a carrier to said premix to obtain a mixed precursor;

[0109] After the mixed precursor is ball milled, a plasticizer is added to obtain a coated catalyst composition.

[0110] In some specific embodiments, the preparation of the precursor solution includes the following steps: dissolving the weighed metal salt of the catalytic active component and the meta...

Embodiment 1

[0139] (1) Preparation of coated catalyst composition

[0140] 1) Dissolve 2.05kg of the active catalyst component ammonium metavanadate and 4.06kg of the catalytic promoter ammonium paratungstate in 70kg of deionized water at about 55°C, cool to room temperature, and then add 2kg dropwise with a mass concentration of 25-28% ammonia water to adjust the pH value to 9-10 to obtain mixed solution A (precursor solution);

[0141] 2) The quantitatively weighed dispersant polyethylene glycol 3kg, the defoamer isopropyl alcohol 0.5kg and the binding agent pH are 8, and the silica sol 10kg with a solid content of 30% is added in the above-mentioned mixed solution A, and the Stir under emulsifier for 10min to obtain mixed solution B (premix);

[0142] 3) Weighing 60 kg of quantitative anatase-type titanium dioxide and adding it to the above mixed solution B, mechanically stirring for 15 minutes, and fully mixing to obtain mixed solution C (mixed precursor);

[0143] 4) Place the abov...

Embodiment 2

[0149] (1) Preparation of coated catalyst composition

[0150] 1) Dissolve 1.05kg of the catalyst active components ammonium metavanadate and 3.03kg of ferric nitrate in 70kg of deionized water at about 55°C, cool to room temperature, then add 1.5kg of oxalic acid dropwise to adjust the pH value to 1-2 , to obtain mixed solution A (precursor solution);

[0151] 2) The quantitatively weighed dispersant polyethylene glycol 2.5kg, the defoamer isopropanol 0.5kg and the binding agent pH are 3, and the silica sol 10kg with a solid content of 30% is added in the above-mentioned mixed solution A. Stir for 10 min under a shear emulsifier to obtain a mixed solution B (premix);

[0152] 3) Weighing 60 kg of quantitative anatase-type titanium dioxide and adding it to the above mixed solution B, mechanically stirring for 15 minutes, and fully mixing to obtain mixed solution C (mixed precursor);

[0153] 4) Place the above mixed solution in a ball mill jar, mill at 800 rpm for 100 min, t...

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Abstract

The invention provides a coating type catalyst composition, a catalytic filter tube and a preparation method thereof. The coating type catalyst composition comprises the following components: a catalytic system; a binder; and a plasticizer, wherein the content of the catalytic system is 10.9-62% by taking the total mass of the coating type catalyst composition as 100%; the content of the binder is 1-7%; the content of the plasticizer is 0.01-6%; and the D90 particle size of particles in the coating type catalyst composition is 0.5 [mu]m-3 [mu]m, and the yield stress of the coating type catalyst composition is 0.2-8 N. The coating type catalyst composition disclosed by the invention can be highly dispersed on the surface and in pore channels of base materials such as ceramic fibers and the like, and does not generate a particle aggregation phenomenon after being calcined and activated, so that the porosity and the air permeability of the base material are ensured, and the base material is low in filtering resistance and high in catalytic efficiency.

Description

technical field [0001] The invention relates to a coating catalyst composition and its preparation method and a catalytic filter tube containing the coating catalyst composition, in particular to a coating catalyst composition and its preparation method and a catalyst filter tube containing the coating catalyst composition The invention discloses a preparation method of a radially graded ceramic catalytic filter tube of a composition, which belongs to the field of environmental protection and the technical field of composite filter material. Background technique [0002] Flue gas from glass, ceramics, steel, cement, coal-fired power plants, waste incineration, etc. contains a large amount of nitrogen oxides (NO X ), which is the main cause of air pollution such as photochemical smog and acid rain. In addition, the flue gas discharged from industrial furnaces contains a large amount of dust, especially PM 10 The following fine particles are suspended in the atmosphere for a ...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01J23/30B01D53/8628Y02A50/2351
Inventor 陈建军尹荣强单良李俊华
Owner TSINGHUA UNIV
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