Preparation method of wide-temperature range rare earth-based composite oxide denitration catalyst

Abstract

The invention discloses a preparation method of a wide-temperature range rare earth-based composite oxide denitration catalyst. The preparation method comprises that titanium dioxide and montmorillonite as carriers, ammonium metatungstate, ammonium metavanadate, cerium nitrate and manganese oxide as active components and accessory materials are subjected to blending, ageing decaying, kneading, molding, drying and roasting to form the wide-temperature range rare earth-based composite oxide denitration catalyst, wherein the accessory materials comprise monoethanolamine, citric acid, ammonia water, lactic acid, stearic acid, glass fibers, wood pulp, hydroxypropyl methyl cellulose, polyoxyethylene, citric acid and water. The preparation method utilizes the rare earth-based composite oxide as an active ingredient, shortens catalyst activation time, effectively controls a SO2/SO3 conversion rate, improves a catalyst temperature adaptation capability, widens a catalyst use temperature range from 320-400 DEG C to 150-420 DEG C, has denitration efficiency more than 90%, and can carry out ammonia spraying denitration operation at a denitration area temperature of 150 DEG C when a boiler is started.

Description

technical field [0001] The invention relates to a honeycomb ceramic catalyst in the technical field of environmental protection, in particular to a preparation method of a wide-temperature rare earth-based composite oxide denitrification catalyst, and the product prepared by the method is especially suitable for thermal power plants, glass factories, chemical plants, etc. Field smoke and dust purification. Background technique [0002] For flue gas denitrification, the most mature technology in the world is SCR denitrification technology. The denitrification catalyst is the core of the whole denitrification system. The SCR denitrification technology is to inject NOx in the flue gas and the reducing agent (NH 3 ) is fully mixed, and in the temperature range of 320-400 ° C, under the action of a denitrification catalyst, a reduction reaction occurs to generate N 2 and H 2 O. [0003] When the denitrification catalyst is turned on, if the temperature of the denitrificatio...

AI Technical Summary

Problems solved by technology

[0003] When the denitrification catalyst is turned on, if the temperature of the denitrification reaction area is lower than 300°C, ammonia cannot be sprayed, otherwise sulfur trioxide and ammonia will react to form ammonium sulfate and attach to the surface of the catalyst and equipment , resulting in catalyst poisoning and equipment corrosion and blockage

If ammonia is not injected, then when the boiler is running during this period, nitrogen oxides will be discharged beyond the standard, causing environmental pollution

If the temperature exceeds 400°C, it will cause thermal sintering of the catalyst and make the catalyst permanently invalid