A kind of preparation method of high active middle and low temperature SCR denitrification catalyst
A denitration catalyst and a high-activity technology, applied in the field of environmental engineering, can solve the problems of insufficient number of crystal faces and the decline of the macroscopic catalytic performance of the catalyst, and achieve the effect of improving the catalytic performance.
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Embodiment 1
[0025] The preparation method of the high-activity medium-low temperature SCR denitration catalyst of this embodiment, the steps are as follows:
[0026] (1) Impregnation: 100 grams of ZSM-5 molecular sieve with a silicon-aluminum ratio of 25, 15.15 grams of Cu (NO 3 ) 2 ·3H 2 Dissolve O in 200mL of water; mix the molecular sieve and copper nitrate aqueous solution evenly, and dry at 80°C for 10 hours to complete the impregnation;
[0027] (2) Calcination: The obtained product was dried at 100°C for 6 hours, and then calcined at 550°C for 6 hours. The obtained catalyst number is Cat-1, and the copper oxide loading is 5%;
[0028] (3) Modification: The prepared Cat-1 was placed in a pressure vessel, and the NO content was 10%. 2 The content is 5%, and the mixed atmosphere of helium as the balance gas is modified. The modification temperature is 600 ° C, and the modification time is 4 hours. The catalyst obtained is Cat-2.
Embodiment 2
[0030] The preparation method of the high-activity medium-low temperature SCR denitration catalyst of this embodiment, the steps are as follows:
[0031] (1) Impregnation: 100 grams of ZSM-5 molecular sieve with a silicon-aluminum ratio of 80, 38.88 grams of Ni (NO 3 )2·6H 2 O was dissolved in 200 mL of water. Mix the molecular sieve and nickel nitrate aqueous solution evenly, and dry at 80°C for 10 hours to complete the impregnation;
[0032] (2) Calcination: The product obtained in step (1) was dried at 100°C for 6 hours, and then calcined at 500°C for 7 hours to obtain a catalyst numbered Cat-3 with a nickel oxide loading of 10%;
[0033] (3) Modification: The prepared Cat-3 was placed in a pressure vessel, and the NO content was 10%. 2 The content is 5%, and the mixed atmosphere of helium as the balance gas is modified. The modification temperature is 700 ° C, and the modification time is 6 hours. The catalyst obtained is Cat-4.
Embodiment 3
[0035] The preparation method of the high-activity medium-low temperature SCR denitration catalyst of this embodiment, the steps are as follows:
[0036] (1) Impregnation: 100 grams of ZSM-5 molecular sieve with a silicon-aluminum ratio of 120, 29.16 grams of Ni (NO 3 ) 2 ·6H 2 O and 22.73 g Cu (NO 3 ) 2 ·3H 2 Dissolve O in 200mL water; mix molecular sieve with copper nitrate and nickel nitrate aqueous solution evenly, and dry at 80°C for 10 hours to complete impregnation;
[0037] (2) Calcination: The product obtained in step (1) was dried at 100°C for 6 hours, and then calcined at 600°C for 5 hours to obtain a catalyst numbered Cat-5, with nickel oxide and copper oxide loadings of 15%;
[0038] (3) Modification: place the prepared Cat-3 in a pressure vessel, use a mixed atmosphere with NO content of 20%, NO2 content of 10%, and helium as the balance gas for modification treatment, and the modification temperature is 700 °C, the modification time is 6 hours, and the pre...
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