Smoke denitration catalyst by catalytic oxidation, and preparation method thereof

Abstract

The invention discloses a smoke denitration NO (Nitric Oxide) oxidation catalyst by catalytic oxidation, and a preparation method thereof. The NO oxidation catalyst is prepared from titanium crosslinking clay as a carrier and copper oxide and vanadium oxide as active ingredients, wherein the titanium crosslinking clay carrier is prepared by taking acetone as a dispersing agent and crosslinking and aging titanic acid butyl acetate and sodium base montmorillonite turbid liquid under an acid condition. Copper nitrate and ammonium metavanadate solutions are used as the precursors of the active ingredients, are fixed on the carrier by an immersion method, and are dried and calcined by program heating to obtain the smoke denitration catalyst by catalytic oxidation. In the catalyst, the copper capacity is 2-10%, and the vanadium capacity is 0.5-5%. The smoke denitration catalyst by catalytic oxidation has the advantages of good sulfur and water tolerance, good reproducibility and good denitration effect.

Description

technical field [0001] The invention relates to a NO oxidation catalyst used for catalytic oxidation flue gas denitrification and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO X ) is one of the main air pollutants and an important precursor for inducing photochemical smog and acid rain. Now the world's annual NO X The emissions have reached 35-58Mt, of which more than 95% come from the combustion process of fossil fuels. [0003] Take NH 3 Selective catalytic reduction (SCR) technology as a reducing agent is the current treatment of NO in flue gas X The most commonly used method. But this method has the following four disadvantages ① SCR method uses ammonia as an important chemical raw material, but generates useless nitrogen emissions, resulting in high SCR operating costs; ② The stoichiometric ratio of ammonia and NO needs to be strictly controlled , otherwise the penetration of unreacted ammonia will cause secondary pollution; ③ due ...

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Problems solved by technology

[0003] Take NH 3 Selective catalytic reduction (SCR) technology as a reducing agent is the current treatment of NO in flue gas X The most commonly used method. However, this method has the following four disadvantages ① SCR method uses ammonia as an important chemical raw material, but generates useless nitrogen emissions, resulting in high SCR operating costs; ② The stoichiometric ratio of ammonia and NO needs to be strictly controlled , otherwise the penetration of unreacted ammonia will cause secondary pollution; ③ due to H 2 O and SO 2 It is an inevitable component in the flue gas. The surface of the catalyst is easily blocked and covered by the generated ammonium salt, so the reaction temperature must be above 350°C to decompose the ammonium salt and maintain good activity.

For this reason, the reactor must be placed in a high-temperature and high-dust area, and the catalyst is vulnerable to corrosion and wear of high-concentration smoke; ④The economizer and air preheater of boilers in my country are assembled in one piece, which is not conducive to the installation of SCR reactors, and is difficult Direct application on existing boilers