Method for preparing Cu-type microporous molecular sieve from Na-type microporous molecular sieve in one step, obtained product and application
A technology of microporous molecular sieve and molecular sieve, which is applied in separation methods, molecular sieve catalysts, chemical instruments and methods, etc., and can solve problems such as poor copper modification effect, ammonia nitrogen wastewater, poor performance, etc.
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Embodiment 1
[0020] Weigh 1 g of Na-SSZ-13 molecular sieve with a silicon-aluminum ratio of 4 in a three-necked flask, and measure 50 mL of CuCl with a concentration of 0.01mol / L 2 solution, the CuCl 2 The solution was mixed and stirred with Na-SSZ-13 molecular sieve, and the pH was adjusted between 3-4 with 0.1 mol / L HCl at 30 °C. After the pH of the mixture was stable, the three-neck flask containing the mixture was transferred to a water bath at 80 °C, and heated and stirred for 1 h. The mixture was centrifugally washed to neutrality, pre-dried at 80 °C for 8 h, then dried at 105 °C for 12 h, and finally calcined at 575 °C for 8 h in an air atmosphere to obtain Cu-SSZ-13 molecular sieves.
Embodiment 2
[0022] Cu-SSZ-13 molecular sieves were prepared according to the method of Example 1. The difference was that the copper salt solution was changed to 0.02mol / L CuCl 2 solution; heated and stirred in a water bath at 80 °C for 2 h.
Embodiment 3
[0024] Cu-SSZ-13 molecular sieve was prepared according to the method of Example 1. The difference was that the silicon-aluminum ratio of Na-SSZ-13 molecular sieve used was 10; the copper salt solution was changed to 0.05 mol / L Cu(CH 3 COO) 2 solution; heated and stirred for 3 h.
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