Method for preparing SAPO-34 molecular sieve
A technology of SAPO-34 and molecular sieves, which is applied in the field of preparation of SAPO-34 molecular sieves, can solve problems such as complex feeding sequence operations, and achieve the effects of convenient operation, uniform particle size, and simple process
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Embodiment 1
[0029] Mix 15.1g (0.074mol) of aluminum isopropoxide and 27.89g (1.55mol) of deionized water evenly, then add 8.69g (0.075mol) of 85% orthophosphoric acid, and then add 11.23g (0.11mol) of triethylamine in sequence after stirring evenly and 5.87g (0.029mol) of 30% silica sol, fully stirred. The above mixture was put into a pressure-resistant container lined with polytetrafluoroethylene, and after ultrasonic treatment at a temperature of 20°C, a frequency of 40kHz, and a power of 200W for 0.5hr, it was crystallized at a temperature of 200°C for 18hr. The solid product was centrifuged and washed, dried at a temperature of 110° C. for 3 hours, and then the dried solid product was calcined at a temperature of 550° C. for 6 hours to obtain a SAPO-34 molecular sieve product. The measured crystallinity of the product is 93%, and the average particle size is 3.7 μm.
Embodiment 2
[0031] Will Al 2 o 3 Add 5.72g (0.037mol) of pseudo-boehmite with a content of 66% into 17.43g (0.012mol) of 10wt% tetraethylammonium hydroxide aqueous solution, mix well and slowly add 4.26g (0.037mol) of 85% orthophosphoric acid dropwise , and add 100 g (5.56 mol) of deionized water and stir evenly, then add 1.10 g (0.0055 mol) of 30% silica sol and 11.51 g (0.64 mol) of deionized water, and stir well. The above system was put into a polytetrafluoroethylene pressure vessel, and after ultrasonic treatment at a temperature of 90° C., a frequency of 60 kHz, and a power of 400 W for 1 hr, it was crystallized at a temperature of 180° C. for 48 hrs. The solid product was centrifuged and washed, dried at a temperature of 115° C. for 2.5 hours, and then the dried solid product was calcined at a temperature of 545° C. for 6 hours to obtain a SAPO-34 molecular sieve product. The measured crystallinity of the product is 95%, and the average particle size is 1.1 μm.
Embodiment 3
[0033] Will Al 2 o 3 Add 5.72g (0.037mol) of pseudo-boehmite with a content of 66% into 33.87g (0.023mol) of 10wt% tetraethylammonium hydroxide aqueous solution, stir well and then add 4.40g (0.022mol) of 30% silica sol and stir well , and then slowly dropwise added 8.52 g (0.074 mol) of 85% orthophosphoric acid and 43.13 g (2.4 mol) of deionized water and mixed uniformly. The above system was put into a polytetrafluoroethylene pressure vessel, pre-crystallized at a temperature of 80° C. for 24 hours, and then crystallized at a temperature of 200° C. for 24 hours. The solid product was washed by centrifugation, dried at a temperature of 105° C. for 3 hours, and then the dried solid product was calcined at a temperature of 560° C. for 5 hours to obtain a SAPO-34 molecular sieve product. The measured crystallinity of the product is 98%, and the average particle size is 2.7 μm.
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