Preparation method of high-strength and antioxidant rare-earth-based smoke denitration catalyst

Abstract

The invention discloses a preparation method of a high-strength and antioxidant rare-earth-based smoke denitration catalyst. The preparation method of the high-strength and antioxidant rare-earth-based smoke denitration catalyst comprises the following steps: by taking titanium dioxide and montmorillonite as carriers and ammonium metatungstate, cerous nitrate and lanthanum nitrate as active components, mixing, ageing, kneading, forming, drying and roasting with the accompanying of auxiliary materials. The auxiliary materials comprise ammonia water, lactic acid, citric acid, stearic acid, glass fiber, wood pulp, hydroxypropyl methyl cellulose, polyoxyethylene, monoethanolamine and water. The product prepared by the method is separated under a high SO2 smoke condition, nitric oxide in the smoke can be decomposed; meanwhile, the purpose of removing mercury and dioxin can be achieved. According to the preparation method of the high-strength and antioxidant rare-earth-based smoke denitration catalyst, the rare earth elements, namely cerium and lanthanum are used as the active components, so that the addition amount of vanadium is reduced, the toxicity of the product is reduced or the product is non-toxic product, the pressure of the post treatment of the product is reduced; the environmental protection pressure is reduced; the product is environmentally friendly; the product can be widely used in the field of thermal power plants, glass factories and chemical plants.

Description

technical field [0001] The invention relates to a rare earth transition metal oxide honeycomb ceramic denitrification catalyst in the technical field of environmental protection, in particular to a preparation method of a rare earth-based high-strength, oxidation-resistant flue gas denitrification catalyst. The product prepared by the method is especially suitable for dust purification in thermal power plants, glass factories, chemical plants and other fields. Background technique [0002] Nitrogen oxides (NOx) are one of the pollution sources that cause air pollution. It not only damages various human organs, but even causes cancer. [0003] For flue gas denitrification, the most mature technology in the world is SCR denitrification technology. SCR denitrification technology refers to the use of honeycomb ceramics as a carrier, with vanadium pentoxide as an active component, and the NOx in the flue gas and the reducing agent (NH 3 ) undergoes a reduction reaction to ge...

AI Technical Summary

Problems solved by technology

It causes the problem of difficult catalyst disposal, which brings huge environmental pressure to the owner

At the same time, vanadium pentoxide has a higher oxidation rate, which converts sulfur dioxide into sulfur trioxide, so that sulfur trioxide and ammonia gas are combined to produce ammonium sulfate, which will cause corrosion and blockage of equipment, resulting in frequent maintenance of equipment and affecting production.

In addition, the carrier used in this type of denitration catalyst is made of titanium dioxide, which is easy to crack, wear and collapse during production and application.