Preparation method for honeycomb-shaped low-temperature denitration catalytic material taking TiO2-Mg2Al4SiO18 as carrier

Abstract

The invention provides a preparation method for a honeycomb-shaped low-temperature denitration catalytic material taking TiO2-Mg2Al4SiO18 as a carrier and belongs to an environment material and a catalysis technology. According to the preparation method, the mass percent of cordierite in a composite carrier is 40%-60%; the carrier, manganese acetate, cerous nitrate, ferric nitrate, nickel nitrate, glass fibers and methylcellulose are weighed according to a mass ratio of 100 to (50-70) to (10-20) to (5-10) to (3-8) to (10-15) to (5-10) and then are mixed; 30-40 parts of silica sol, 1-2 parts of triethanolamine, 0.3-0.9 part of polyether polyol, 3-6 parts of soya-bean oil and 1-5 parts of water are added and agitated; then a mixture is agitated and extruded, aged, dried and roasted. According to the preparation method, after the cordierite is added into the carrier, the mechanical strength of the honeycomb-shaped catalytic material is improved and the cost is reduced; a strict drying roasting system is adopted so that a cracking phenomenon is reduced and the yield of the honeycomb-shaped catalytic material is more than 80%; the preparation method is applicable to industrial production and has good denitration effect.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and mainly relates to a cement kiln for TiO 2 -Mg 2 Al 4 Si 5 o 18 A method for preparing a honeycomb-shaped low-temperature flue gas denitrification catalytic material as a carrier. Background technique [0002] Nitrogen oxides (NOx) are atmospheric pollutants that cause acid rain. Fuel combustion and industrial production will produce NOx, and NOx pollution has become a serious global problem. During the "Twelfth Five-Year Plan" period, NOx has been included in the binding index system, and the total emission needs to be reduced by 10%. In 2013, my country's cement output was 2.41 billion tons, and the production of cement produced a large amount of NOx, and the emission concentration was about 300mg / Nm 3 ~2200mg / Nm 3 In 2013, the national cement emitted about 2.2 million tons of nitrogen oxides, accounting for about 10% of the country's total nitrogen oxide emissions. NO 2 The limi...

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Problems solved by technology

[0004] At present, there are many patents for SCR denitrification catalytic materials that have been applied for. According to the published patents, SCR denitrification catalysts are mainly divided into honeycomb type, flat plate type and corrugated type in terms of structure types. Currently, honeycomb type generally accounts for 80% of the market. The share is the mainstream of application, and the honeycomb type is roughly divided into two types. The first type is to make a honeycomb frame with materials such as cordierite and metal, and then impregnate active substances such as titanium dioxide and manganese salts on it. The mechanical strength of the catalytic material is high, but the active material on the surface of the honeycomb is easy to fall off due to gas scouring; the second method is to directly form materials such as titanium dioxide and manganese salt into a honeycomb catalytic material, and the activity of this catalytic material is maintained. Its mechanical strength is not as good as that of the former, and titanium dioxide as a carrier can fully load active substances, and cordierite is generally not used as a carrier in this kind of catalyst due to its small specific surface area; and the common problem of honeycomb catalytic materials is cracking, and the yield is low, resulting in So far, the manganese cerium titanium system has not been industrialized; therefore, it is extremely urgent to develop a honeycomb catalyst with strong erosion resistance, high mechanical strength, strong catalytic ability and crack resistance

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