Preparation method of CHA molecular sieve SCR monolithic catalyst
A monolithic catalyst and molecular sieve technology, which is applied in molecular sieve catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve problems such as coating failure, hole plugging and slurry hanging, slurry viscosity is difficult to control, etc., to improve silicon aluminum Ratio, increase the stability of the slurry, and the effect of easy control of the viscosity of the slurry
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Embodiment 1
[0031] Example 1: A preparation method of CHA molecular sieve SCR monolithic catalyst includes the following steps:
[0032] (1) Preparation of Cu-SSZ-13 molecular sieve aqueous solution:
[0033] a. Prepare the Cu-SSZ-13 molecular sieve aqueous solution with a mass fraction of 45%;
[0034] b. Stir until the Cu-SSZ-13 molecular sieve is basically dissolved and ball milled to a particle size of 1.5μm;
[0035] (2) Preparation of adhesive:
[0036] a. Prepare a boehmite aqueous solution with a mass fraction of 8% and add HNO 3 Adjust the pH value of the aqueous solution to 3, in a constant temperature water bath at 90°C for 2 hours, and age for 3 days to obtain Al sol;
[0037] b. Prepare an aqueous solution of ultrafine nano-silica powder with a mass fraction of 30% and add HNO 3 Adjust the pH value of the aqueous solution to 2, 65°C constant temperature water bath for 2 hours, aging for 2 days to obtain Si sol;
[0038] c. According to the molar ratio of Si 4+ :Al 3+ =3, mix Al sol and S...
Embodiment 2
[0058] Embodiment 2: A preparation method of CHA molecular sieve SCR monolithic catalyst includes the following steps:
[0059] (1) Preparation of Cu-SSZ-13 molecular sieve aqueous solution:
[0060] a. Prepare an aqueous solution of Cu-SSZ-13 molecular sieve with a mass fraction of 47%;
[0061] b. Stir until the Cu-SSZ-13 molecular sieve is basically dissolved and ball milled to a particle size of 7.5μm;
[0062] (2) Preparation of adhesive:
[0063] a. Prepare boehmite aqueous solution with mass fraction of 5% and add HNO 3 Adjust the pH value of the aqueous solution to 5, in a constant temperature water bath at 90°C for 2 hours, and age for 3 days to obtain Al sol;
[0064] b. Prepare an aqueous solution of ultrafine nano-silica powder with a mass fraction of 30% and add HNO 3 Adjust the pH value of the aqueous solution to 2, a constant temperature water bath at 75°C for 2 hours, and age for 2 days to obtain Si sol;
[0065] c. According to the molar ratio of Si 4+ :Al 3+ =4, mix Al s...
Embodiment 3
[0072] Embodiment 3: A preparation method of CHA molecular sieve SCR monolithic catalyst includes the following steps:
[0073] (1) Preparation of Cu-SAPO-34 molecular sieve aqueous solution:
[0074] a. Prepare an aqueous solution of Cu-SAPO-34 molecular sieve with a mass fraction of 55%;
[0075] b. Stir until the Cu-SAPO-34 molecular sieve is basically dissolved and ball milled to a particle size of 8.5μm;
[0076] (2) Preparation of adhesive:
[0077] a. Prepare boehmite aqueous solution with mass fraction of 6% and add HNO 3 Adjust the pH value of the aqueous solution to 5, in a constant temperature water bath at 90°C for 3 hours, and age for 5 days to obtain Al sol;
[0078] b. Prepare an aqueous solution of ultrafine nano-silica powder with a mass fraction of 25% and add HNO 3 Adjust the pH value of the aqueous solution to 2, in a constant temperature water bath at 75°C for 3 hours, and age for 5 days to obtain Si sol;
[0079] c. According to the molar ratio of Si 4+ :Al 3+ =4, mi...
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