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Denitrification catalytic filter element and preparation method thereof

A technology for catalytic filtration and filter elements, applied in chemical instruments and methods, separation methods, dispersed particle filtration, etc., can solve the problems of limiting the load of catalytic active substances, difficult to fully penetrate and fall of sol

Active Publication Date: 2017-04-12
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The inventors of the present invention found in follow-up research that during the preparation process of the filter catalytic element of the reference document, the sol as the material source of the intermediate layer was first impregnated into the porous matrix, and then the sol in the porous matrix was gelled, and then the attached The porous matrix of the above-mentioned gel is heat-treated to convert the gel into nanoparticles, and then the process method of forming the intermediate layer cannot make the combination between the intermediate layer and the porous matrix very firm. The intermediate layer changes from porous to porous during the use of the filter catalytic element. The risk of falling on the substrate; and, affected by factors such as the surface tension of the porous substrate, the sol is not easy to fully penetrate the entire porous substrate, which limits the loading of catalytically active substances

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  • Denitrification catalytic filter element and preparation method thereof

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Embodiment 1

[0023] The microstructure of the filter element of embodiment 1 is as follows figure 1 As shown, it specifically includes a porous composite body 100. The average pore size of the porous composite body 100 is generally in the range of 1 to 200 μm and is set according to the specific needs of gas-solid separation and filtration. The porous composite body 100 includes: a porous matrix 110 , the porous matrix 110 is made of powder sintered metal porous material or powder sintered ceramic porous material and has three-dimensional interconnected network pores 111; the middle layer 120, the middle layer 120 is attached to the pore surface of the porous matrix 110 and increases the porosity Substrate 110 hole surface roughness ( figure 1 The surface indicated by the middle label "111" is the boundary surface between the porous substrate 110 and the intermediate layer 120); the catalytically active layer 130, the catalytically active layer 130 is attached to the pore surface of the po...

Embodiment 2

[0035] ①Preparation steps of denitrification catalytic filter element

[0036] A. The porous matrix 110 is prepared by powder metallurgy, wherein the powder raw material for preparing the porous matrix 100 includes the first powder for sintering to form the porous matrix 100 and the first intermediate layer for sintering to form the porous matrix 100 during sintering. 121 or the second powder of the precursor substance of the first intermediate layer 121, the first powder is the raw material powder of the Fe-Al intermetallic compound-based alloy porous material, and the first powder specifically contains 22% of Al powder, 65% of Fe powder, 8% of Cr powder, the second powder specifically contains 5% of the total weight of the powder raw material Al 2 o 3 Powder, the particle size of the above-mentioned first powder is -100~+400 mesh, the particle size of the second powder is ≤10μm, after the powder raw material is prepared, it is prepared according to the preparation method of...

Embodiment 3

[0043] ①Preparation steps of denitrification catalytic filter element

[0044] A. The porous matrix 110 is prepared by powder metallurgy, wherein the powder raw material for preparing the porous matrix 100 includes the first powder for sintering to form the porous matrix 100 and the first intermediate layer for sintering to form the porous matrix 100 during sintering. 121 or the second powder of the precursor substance of the first intermediate layer 121, the first powder is the raw material powder of the Fe-Al intermetallic compound-based alloy porous material, and the first powder specifically contains 20% Al powder, 63% Fe powder and 8% Cr powder, the second powder specifically includes 7% Ti powder and 1.5% Al 2 o 3 powder and 0.5% SiO 2 Powder, the particle size of the above-mentioned first powder is -100~+400 mesh, the particle size of the second powder is ≤10μm, after preparing the powder raw material, it is prepared according to the preparation method of Fe-Al interm...

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Abstract

The invention discloses a denitration catalysis filtering element and a preparation method. The filtering element comprises a porous complex which comprises a porous matrix, wherein the porous matrix is formed by a sintering metal porous material or a sintering ceramic porous material as well as has three dimensional communicated network apertures; an interface layer, wherein the interface layer is attach to the aperture surface of a porous matrix and can increase the aperture surface roughness of the porous matrix; a catalytic activity layer, wherein the catalytic activity layer takes an interface layer as a carrier and is attach to the aperture surface of the porous matrix and is formed by the denitration catalytic activity substance. The interface layer comprises a first interface layer, the first interface layer or a precursor substance of the first interface layer is generated on the porous matrix when the porous matrix is sintered; the interface layer also comprises a second interface layer, the second interface layer is formed on the first interface layer through an external covering mode after the first interface layer is formed; and the first interface layer and the second interface layer are formed by Al2O3.

Description

technical field [0001] The invention relates to a filter element and a preparation method thereof, in particular to a filter element with dual functions of filtering flue gas and denitrification catalysis and a preparation method thereof. Background technique [0002] Industrial furnace gas often contains a large amount of dust and nitrogen oxides. A typical example is the furnace gas of a coal-fired power plant boiler. The nitrogen oxides contained in it are the main cause of acid rain. It also contains dozens of grams of dust. The usual method for purifying industrial furnace gas with high dust and nitrogen oxide content such as coal-fired power plant boiler furnace gas is to first introduce the furnace gas into the SCR reactor (in the process of introducing the furnace gas into the SCR reactor, it is necessary to Inject a reducing agent into the furnace gas, the reducing agent is usually ammonia water) so as to reduce the nitrogen oxides to harmless nitrogen, realize the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/56B01D53/86B01D46/00B01J23/30
Inventor 高麟汪涛莫代林李波覃金刘勇任德忠
Owner CHENGDU INTERMENT TECH