Method for preparing low-temperature SCR (selective catalytic reduction) denitration catalyst

Abstract

The invention relates to a method for preparing a low-temperature SCR (selective catalytic reduction) denitration catalyst, and belongs to the technical field of catalysis. The denitration catalyst has a good nitric oxide removal rate, water resistance and sulfur resistance when the temperature of flue gas ranges from 150 DEG C to 250 DEG C. The method includes dissolving ammonium metavanadate, transition metal salts and titanium and tungsten powder in water; and drying and calcining the mixed liquor to prepare the low-temperature SCR denitration catalyst. The prepared catalyst is good in low-temperature activity, and can keep the good nitric oxide removal rate, the water resistance and the sulfur resistance at the temperature ranging from 150 DEG C to 250 DEG C. In addition, owing to the high activity and poison resistance at the temperature ranging from 150 DEG C to 250 DEG C, the catalyst can be applied to the field of flue gas after the flue gas flows via dust catchers of thermal power plants and flue gas, with the temperature ranging from 150 DEG C to 250 DEG C, of industrial furnaces and the like, and denitration catalyst technology and application breakthrough is realized.

Description

technical field [0001] The invention relates to a preparation method of a low-temperature SCR denitration catalyst. The denitration catalyst still has good nitrogen oxide removal rate and water and sulfur resistance performance at a flue gas temperature of 150-250° C., and belongs to the technical field of catalysis. Background technique [0002] During the "Twelfth Five-Year Plan" period, the country's control over nitrogen oxide emissions has become more and more stringent, and pure low-nitrogen combustion technology can no longer meet the requirements of current emission standards. Selective catalytic reduction (SCR) technology is due to its efficient and reliable denitrification Performance has begun to be applied in domestic coal-fired power plants. The main principle of SCR is based on NH 3 As a reducing agent, under the action of denitrification catalyst, NO x reduced to N 2 . [0003] At present, vanadium-tungsten-titanium catalyst is the most widely used. Due to...

AI Technical Summary

Problems solved by technology

At this time, most of the dust, heavy metals and substances contained in the flue gas that are likely to poison the catalyst are removed by the dust collector, which reduces the risk of catalyst wear, blockage and poisoning deactivation, increases the service life of the catalyst, and reduces the replacement of the catalyst. cycle, reducing the operating cost of the denitrification system, but in the low-dust arrangement, the flue gas temperature drops a lot, between 150-200 ° C, which poses a challenge to the low-temperature activity of the catalyst

[0004] In addition, the nitrogen oxides emitted by my country's industrial kilns (glass kilns, cement kilns, etc.) also account for a large part of the total domestic nitrogen oxide emissions, which is the second source of emissions after thermal power plants. The flue gas temperature of industrial kilns is relatively low, mostly between 150-250 °C, and there is no flue gas denitrification catalyst suitable for industrial kilns at present