Flue gas denitration catalyst and preparation method and application thereof

Abstract

The invention discloses a flue gas denitration catalyst. The catalyst comprises a carrier and a catalytic activity component, wherein the catalytic activity component is manganese, cobalt and cerium composite oxide, wherein the molar ratio of the manganese element to the cobalt element to the cerium element is 1:0.1-1:0.1-1. A preparation method of the flue gas denitration catalyst comprises the following steps of: (1) taking a soluble manganese salt, a soluble cobalt salt and a soluble cerium salt, wherein the molar ratio of the manganese element to the cobalt element to the cerium element is 1:0.1-1:0.1-1, dissolving the salts in deionized water, and adding ammonia water to adjust the pH value to between 5 and 7; (2) soaking a carrier in aqueous solution of citric acid, diluted hydrochloric acid or diluted nitric acid for 24 to 48 hours, drying the carrier, soaking the carrier in the solution of the step (1), standing the carrier for 24 hours and drying the carrier; and (3) roastingthe prepared sample in step (2) in air, and cooling the sample. The flue gas denitration catalyst has the advantages of simple preparation method, high poisoning resistance, no secondary pollution toenvironment, wide activity temperature window, low activity starting temperature and the like.

Description

technical field [0001] The invention relates to a flue gas denitrification catalyst and its preparation and application. Background technique [0002] Nitrogen oxides mainly come from fuel combustion in industrial production (accounting for 90% of total human emissions) and transportation fuel combustion emissions, and some come from nitric acid plants, sulfuric acid plants, nitrogen fertilizer plants, fuel plants, pharmaceutical plants, etc. Enterprise emissions are one of the main sources of air pollution. With the continuous acceleration of my country's industrialization process, NO X Pollution is getting worse. In the Air Pollutant Emission Standards for Thermal Power Plants (Draft for Comment) promulgated in 2010, the state stipulates that 200mg / m 3 emission concentration limit. At the same time, during the "Twelfth Five-Year Plan" period, my country will increase energy conservation and emission reduction, increase denitrification (NO X Removal) this restrictive h...

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Problems solved by technology

Among them, the catalyst carrier and active component raw materials described in the patent (CN 101069855A) are relatively expensive; the catalyst described in the patent (CN 1724149A) has good activity but a narrow activity temperature window, and it has good SCR only when it is above 100°C Denitrification activity; the catalyst described in the patent (CN 101468314A) is added with highly toxic vanadium oxide, which will cause environmental harm in both production and recycling

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