A kind of preparation method and application of cure/sapo-34 molecular sieve
A molecular sieve and roasting technology, which is applied in separation methods, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as structural collapse and poor hydrothermal stability, achieve good low-temperature hydrothermal stability, and improve low-temperature water resistance. effect
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Embodiment 1
[0049] It was prepared according to the present embodiment CuCe / SAPO-34 molecular sieve sample 1 catalyst.
[0050] (1) One-step Synthesis of Ce / SAPO-34 molecular sieve
[0051] The 27.0g H 2 O and 23.6g mass fraction of 85wt% phosphoric acid (85wt%) mixed, was added 13.8g of pseudoboehmite and boehmite, followed by addition of 30g H 2 O stir the raw material to obtain a solution A; nitrate containing 0.0061mol / L Ce dissolved in 10g H 2 After the resulting solution B O, the solution B was added slowly the solution A, stirring IH; and then silica sol was added 8.29g 17.43g morpholine, was added 20g H 2 O, stirred vigorously IH; then adjusting the pH of the mixture to 7 with acetic acid or aqueous ammonia, was added 0.01g finally seeded and stirred vigorously 1h.
[0052] The aqueous gel was fully stirred autoclave 150 ℃ crystallized one day after completion of the reaction cooled at room temperature the crystallization, the crystallized solid was separated from the mother liq...
Embodiment 2
[0060] Preparation CuLa / SAPO-34 molecular sieve catalyst of the present embodiment.
[0061] Preparation Example CuLa / SAPO-34 molecular sieve catalyst 1 CuCe / SAPO-34 was prepared similar to Sample 1 molecular sieve catalyst, the nitrate only step (1) containing 0.0061mol / L Ce replaced containing 0.0061 mol / LLa nitrate, other molar ratio is kept the same ingredients to prepare CuLa / SAPO-34 molecular sieve catalyst.
[0062] CuLa / same SAPO-34 molecular sieve catalyst low temperature hydrothermal treatment conditions as in Example 1, the low-temperature hydrothermal treatment.
[0063] Determination CuLa / SAPO-34 containing about 2.0wt% of copper zeolite catalyst by inductively coupled plasma emission spectroscopy (ICP).
[0064] CuLa / SAPO-34 molecular sieve catalyst XRD before and after the hydrothermal treatment such as low temperature Figure 4 , A BET specific surface area shown in Table 1, and NH 3 -SCR catalytic reactions such as NOx conversion rate Figure 5 .
Embodiment 3
[0066] Preparation CuPr / SAPO-34 molecular sieve catalyst of the present embodiment.
[0067] Preparation Example CuPr / SAPO-34 molecular sieve catalyst 1 CuCe / SAPO-34 was prepared similar to Sample 1 molecular sieve catalyst, the nitrate only step (1) containing 0.0061mol / L Ce replaced containing 0.0061 mol / LPr nitrate, other molar ratio is kept the same ingredients to prepare CuPr / SAPO-34 molecular sieve catalyst.
[0068] CuPr / same SAPO-34 molecular sieve catalyst low temperature hydrothermal treatment conditions as in Example 1, the low-temperature hydrothermal treatment.
[0069] Determination CuPr / SAPO-34 molecular sieve catalyst contains about 2.4wt% of copper by inductively coupled plasma emission spectroscopy (ICP).
[0070] CuPr / SAPO-34 molecular sieve catalyst XRD before and after the hydrothermal treatment such as low temperature Image 6 , A BET specific surface area shown in Table 1, and NH 3 -SCR catalytic reactions such as NOx conversion rate Figure ...
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