A kind of sapo-34 molecular sieve taking n-methyldiethanolamine as template and its synthetic method
A technology of SAPO-34 and methyldiethanolamine, which is applied in molecular sieve catalysts, molecular sieves and alkali-exchanged phosphates, molecular sieve-specific silicoaluminophosphates, etc., can solve problems such as limited reserves of petroleum resources, unstable supply, and rising prices. Achieve excellent catalytic performance and good selectivity
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Embodiment 1
[0043] The molar proportions of raw materials, crystallization conditions and elemental composition of the samples are shown in Table 1. The specific batching process is as follows, 14.07g pseudo-boehmite (Al 2 o 3 Mass percent composition 72.5%) and 78.47g deionized water are mixed and dripped 23.06g phosphoric acid (H 3 PO 4 Mass percent composition 85%), add 6g silica sol (SiO 2 30.34% by mass), finally add 35.7g of N-methyldiethanolamine, stir evenly to form a gel, and transfer the gel to a stainless steel reaction kettle. The molar ratio of each component in the synthesis system is 3.0MDEA:0.30SiO 2 : 1Al 2 o 3 : 1P 2 o 5 :50H 2 O.
[0044] After putting the reaction kettle into the oven, the temperature was programmed to 200°C for dynamic crystallization for 48 hours. After the crystallization, the solid product was centrifuged, washed, and dried in air at 100°C to obtain the original powder. The original powder sample was analyzed by XRD (Table 2), and the r...
Embodiment 2-19
[0052] The specific batching ratio and crystallization conditions are shown in Table 1, and the specific batching process is the same as in Example 1.
[0053] Synthetic samples were analyzed by XRD, and the data results were close to those in Table 2, that is, the peak positions and shapes were the same, and the relative peak intensity of the peaks fluctuated in the range of ±10% according to the change of the synthesis conditions, indicating that the synthetic products had the characteristics of the SAPO-34 structure. The results of elemental composition analysis of the product are shown in Table 1.
[0054] Carry out to the former powder sample of embodiment 1-10 13 C MAS NMR analysis by mixing with N-methyldiethanolamine 13 The C MAS NMR standard spectrum was compared, and it was found that there was only the resonance peak of N-methyldiethanolamine in the sample.
Embodiment 20
[0056] The sample obtained in Example 1 was calcined at 550° C. for 4 hours, and then pressed into tablets and crushed to 20-40 meshes. Weigh 5.0 g of the sample and put it into a tank reactor filled with 30 ml of ethanol to carry out ethanol dehydration reaction. The reaction temperature was set at 150° C., and the reaction was carried out under stirring. The reaction results show that the conversion rate of ethanol can reach 91%, and the selectivity of ether in the product is 91%.
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