A kind of synthetic method of microporous sapo-34 molecular sieve
A technique for the synthesis of SAPO-34, which is applied in the direction of molecular sieve catalysts, molecular sieves and alkali-exchanged phosphates, molecular sieve characteristic silicoaluminophosphates, etc., can solve the problems of micropore and mesopore phase separation, etc., and achieve catalyst life extension, excellent The effect of catalytic performance
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Embodiment 1
[0044] The proportions of raw materials, crystallization conditions and elemental composition of samples are shown in Table 1. The specific batching process is as follows:
[0045] 21.6g OS-12 (mass percentage composition 72%) and 89.8g deionized water were mixed and stirred for 5 hours, and 14.0g pseudo-boehmite (Al 2 o 3 Mass percent composition 72.5%), 23.0g phosphoric acid (H 3 PO 4 Mass percentage composition 85%), 30.6g triethylamine (TEA mass percentage composition 99%), 8.6g silica sol (SiO 2 31% by mass), stirred and aged for 24 hours, and the molar ratio of the components obtained was 1.0P 2 o 5 :1.0Al 2 o 3 :0.76SiO2 2 :3.0TEA:50H 2 O's SAPO gel, which has a molar ratio of OS-12 to silica sol of 7:10. Then add 18.8 g of SAPO-34 seed crystals to the above gel, stir at room temperature for 12 hours, transfer the gel to a stainless steel reactor, put the reactor into an oven, and program the temperature to 150°C for 24 hours to rotate and crystallize. After ...
Embodiment 2～14
[0060] The specific batching ratio and crystallization conditions are shown in Table 1, and the specific batching process is the same as in Example 1.
[0061] Carry out XRD analysis to the samples obtained in Examples 2~14, the data results are close to Table 2, that is, the peak position and shape are the same, and the relative peak intensity fluctuates in the range of ± 10% according to the change of synthesis conditions, indicating that the synthetic product has SAPO-34 characteristics of the structure.
[0062] XRF elemental composition analysis was performed on the samples obtained in Examples 2-14, and the results are shown in Table 1.
[0063] Adopt scanning electron microscope to analyze the morphology of embodiment 2~14 gained sample, gained electron microscope photograph is all with figure 1 resemblance.
Embodiment 15
[0065] The samples obtained in Examples 1 to 7 and Comparative Examples 1 and 2 were air roasted at 600°C for 2 hours, and then N 2 Physical adsorption analysis. The results are shown in Table 3, which shows that not only micropores but also mesopores exist in the samples obtained in Examples 1-7.
[0066] Specific surface area and pore volume of table 3 samples
[0067]
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