A kind of method that uses double templating agent to synthesize sapo-15 molecular sieve
A SAPO-15, dual-template technology, applied in molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of lack of molecular sieve and lack of molecular sieve synthesis technology development work
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Embodiment 1
[0029] Weigh 8.93 g of pseudo-boehmite, 6 g of melamine, 20 g of tetraethylammonium hydroxide, 17.09 g of phosphoric acid, 2.43 g of silica sol and mix with 53.32 g of deionized water in turn. Stir at room temperature for 12 h until a homogeneous gel is formed. The obtained gel was transferred into a 150 mL stainless steel synthesis kettle with PTFE lining, heated to 190 °C for 90 min, and crystallized at this temperature for 48 h. After the crystallization was completed, the synthesis kettle was cooled to room temperature. The obtained product was subjected to suction filtration and washing, and dried in an oven at 110° C. overnight to obtain the original powder of SAPO-15 molecular sieve. Scanning electron microscope results such as figure 2 shown.
Embodiment 2
[0031] Weigh 8.93 g of pseudo-boehmite, 4.5 g of melamine, 20 g of tetraethylammonium hydroxide, 17.09 g of phosphoric acid, 2.43 g of silica sol and mix with 53.32 g of deionized water in turn. Stir at room temperature for 12 h until a homogeneous gel is formed. The obtained gel was transferred into a 150 mL stainless steel synthesis kettle with PTFE lining, heated to 190 °C for 90 min, and crystallized at this temperature for 48 h. After the crystallization was completed, the synthesis kettle was cooled to room temperature. The obtained product was subjected to suction filtration and washing, and dried in an oven at 110° C. overnight to obtain the original powder of SAPO-15 molecular sieve. Scanning electron microscope results such as image 3 shown.
Embodiment 3
[0033] Weigh 8.93 g of pseudo-boehmite, 3 g of melamine, 20 g of tetraethylammonium hydroxide, 17.09 g of phosphoric acid, 2.43 g of silica sol and mix with 53.32 g of deionized water in turn. Stir at room temperature for 12 h until a homogeneous gel is formed. The obtained gel was transferred into a 150 mL stainless steel synthesis kettle with PTFE lining, heated to 190 °C for 90 min, and crystallized at this temperature for 48 h. After the crystallization was completed, the synthesis kettle was cooled to room temperature. The obtained product was subjected to suction filtration and washing, and dried in an oven at 110° C. overnight to obtain the original powder of SAPO-15 molecular sieve. Scanning electron microscope results such as Figure 4 shown.
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