Composite filter element and preparation method thereof

Abstract

The invention relates to a filtering dedusting and reaction catalyzing technology, and discloses a composite filter core element. The composite filter core element is a functional element having filtering and reaction catalyzing dual effects on a substance to be filtered, the composite filter core element has a porous complex, the porous complex comprises a porous matrix and a catalytic activity layer, the porous matrix is formed by a porous material, the catalytic activity layer is attached to the pore surface of the porous matrix and is formed by a catalytic active substance, the porous complex also comprises an intermediate layer, the intermediate layer is formed by nanoparticles accumulated on the surface of the porous matrix, the catalytic activity layer is attached to the pore surface of the porous matrix through the intermediate layer, and the intermediate layer is made of a titanium-aluminum composite oxide. The invention also discloses a production method of the composite filter core element. The surface of the intermediate layer is more rough than the pore surface of the porous matrix, so the specific surface area of the porous matrix is greatly improved, thereby the content and the arrangement uniformity of the catalytic activity substance are substantially improved, and the catalytic reaction rate is improved.

Description

technical field [0001] The invention relates to purification treatment of industrial furnace gas, in particular to dust removal and denitrification of industrial furnace gas. Wherein, the term "industrial furnace gas" refers to the furnace gas produced by industrial furnaces. In addition, the present invention also relates to a composite filter element, that is, a functional element with dual functions of filtering dust and catalyzing the material to be filtered. 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...

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Problems solved by technology

In the prior art, the catalytically active substance is attached to the porous substrate through the intermediate layer carrier, and the intermediate layer material is usually TiO 2 , due to TiO 2 High viscosity, low strength, and certain hydraulicity in contact with water, so to prepare a catalytic film layer with a certain shape, mechanical strength, specific surface area and activity, it is often necessary to add various additives to the carrier, which not only increases the cost and complexity of the process properties, but also greatly reduce the specific surface area of ​​the middle layer

And since TiO 2 The water hardness of the middle layer often causes the catalytic active material to fall off after the middle layer absorbs water, greatly reducing the filtration effect and gas reduction rate

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