Preparation method and application of CuRE/SAPO-34 molecular sieve
A molecular sieve, deionized water technology, applied in separation methods, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as poor hydrothermal stability and structural collapse, achieve good low-temperature hydrothermal stability, and improve low-temperature water resistance. , Improve the effect of low temperature hydrothermal stability
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Embodiment 1
[0049] This example is the preparation of CuCe / SAPO-34 molecular sieve sample 1 catalyst.
[0050] (1) One-step synthesis of Ce / SAPO-34 molecular sieve
[0051] 27.0g H 2 O and 23.6g of phosphoric acid (85wt%) with a mass fraction of 85wt% were mixed evenly, and 13.8g of pseudo-boehmite was added, followed by 30g of H 2 O to stir the raw materials evenly to obtain solution A; dissolve the nitrate containing 0.0061mol / L Ce in 10g H 2 After O, solution B was obtained, and solution B was slowly added to solution A, and stirred for 1 h; then 8.29 g of silica sol and 17.43 g of morpholine were added, and then 20 g of H 2 O, stirred vigorously for 1 h; then adjusted the pH of the mixture to 7 with acetic acid or ammonia water, and finally added 0.01 g of seed crystals, and stirred vigorously for 1 h.
[0052] Put the fully stirred gel into a hydrothermal kettle for crystallization at 150°C for 1 day. After the crystallization reaction is completed, cool at room temperature, separ...
Embodiment 2
[0060] This example is the preparation of CuLa / SAPO-34 molecular sieve catalyst.
[0061] The preparation method of CuLa / SAPO-34 molecular sieve catalyst is similar to the preparation method of CuCe / SAPO-34 molecular sieve sample 1 catalyst among the embodiment 1, only is that the nitrate containing 0.0061mol / L Ce in step (1) is changed into containing 0.0061 mol / LLa of nitrate, other molar ratios remain the same, prepared CuLa / SAPO-34 molecular sieve catalyst.
[0062] The conditions for the low-temperature hydrothermal treatment of the CuLa / SAPO-34 molecular sieve catalyst are also the same as those for the low-temperature hydrothermal treatment in Example 1.
[0063] Inductively coupled plasma emission spectrometry (ICP) determined that the CuLa / SAPO-34 molecular sieve catalyst contained about 2.0 wt% copper.
[0064] XRD of CuLa / SAPO-34 zeolite catalyst before and after low temperature hydrothermal treatment Figure 4 , BET specific surface area is shown in Table 1, and ...
Embodiment 3
[0066] This example is the preparation of CuPr / SAPO-34 molecular sieve catalyst.
[0067] The preparation method of CuPr / SAPO-34 molecular sieve catalyst is similar to the preparation method of CuCe / SAPO-34 molecular sieve sample 1 catalyst among the embodiment 1, only is that the nitrate containing 0.0061mol / L Ce in step (1) is changed into containing 0.0061 mol / LPr of nitrate, other molar ratios remain the same, prepared CuPr / SAPO-34 molecular sieve catalyst.
[0068] The conditions for the low-temperature hydrothermal treatment of the CuPr / SAPO-34 molecular sieve catalyst are also the same as those for the low-temperature hydrothermal treatment in Example 1.
[0069] Inductively coupled plasma emission spectrometry (ICP) determined that CuPr / SAPO-34 molecular sieve catalyst contained about 2.4wt% copper.
[0070] XRD of CuPr / SAPO-34 molecular sieve catalyst before and after low temperature hydrothermal treatment Image 6 , BET specific surface area is shown in Table 1, an...
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