Denitration catalyst for CO-SCR flue gas denitrification and preparation method thereof
A denitrification catalyst and catalyst technology, applied in the field of CO-SCR flue gas denitrification denitrification catalyst and its preparation, can solve the problems of lower production cost and easy cracking, and achieve lower production cost, high airflow resistance and high mechanical strength Effect
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[0041] A preparation method for a denitration catalyst for CO-SCR flue gas denitration, comprising the following steps:
[0042] (1) prepare catalyst powder;
[0043] (2) Add additive and described catalyst powder to water, mix uniformly, obtain slurry; Described additive is inorganic binder, organic polymer solution, surfactant;
[0044] (3) impregnating the pretreated, honeycomb-shaped mullite carrier in the slurry, drying and calcining to obtain the denitration catalyst for CO-SCR flue gas denitration.
[0045] Preferably, in the step (1), the catalyst powder is prepared by co-precipitation method;
[0046] The mass percent of each component in the slurry in the step (2) is: water 50-70%, additive 10-20%, catalyst powder 20-40%;
[0047] The pretreatment in the step (3) is as follows: soak the cleaned mullite carrier in the mixed solution containing urea and aluminum salt for 24 hours, dry at 80° C., and then calcinate.
[0048] Further preferably, in the described step ...
Embodiment 1
[0063] The specific operation steps are as follows:
[0064] (1) Dissolving Cu salt and Ce salt in water to form metal salt solution, preparing catalyst powder by co-precipitation method, crushing to 100 mesh or more through a pulverizer, and then sieving for use.
[0065] The copper salt is at least one of copper sulfate, copper chloride and copper nitrate; the cerium salt is at least one of cerium nitrate, cerium chloride and cerium sulfate, and the molar ratio of Ce:Cu is 6.67:1.
[0066] In the preparation of catalyst powder by co-precipitation method: stir the metal salt solution, then add a precipitating agent dropwise (precipitating agent adopts a kind of sodium hydroxide and ammonia water) until its pH is 9-11, stir, let stand for precipitation, The powder catalyst is obtained after suction filtration, drying and calcination.
[0067] Preferably, the catalyst prepared by using cerium nitrate and copper nitrate has the best catalytic performance and is the best choice....
Embodiment 2
[0083] The specific operation steps are as follows:
[0084] (1) Using Al(NO 3 ) 3 9H 2 O Prepare 1 L, 2 mol / L aluminum salt solution, and then prepare 1 L, 6.67 mol / L urea solution, add these two parts of the solution into a jacketed stirring pot and stir for 4 hours at room temperature. Then pour the evenly stirred mixed solution into an iron mold box of 20cm*20cm*20cm, soak the mullite honeycomb carrier for 24 hours, dry and calcinate at 80°C to obtain the pretreated mullite carrier (The weight gain of the mullite carrier after pretreatment is not less than 5% of the mass of the carrier without pretreatment).
[0085] (2) 241.6g of Cu(NO 3 ) 2 ·3H 2 O and 2896.25g of Ce(NO 3 ) 3 ·6H 2 O was added into 2000g of purified water, and stirred until dissolved to obtain a metal salt solution. Then add 1mol / L sodium hydroxide solution to adjust the pH to 10-11, stir for 4 hours and let it stand for 24 hours, then use pure water to filter to neutral, then use ethanol to fi...
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