Fast synthetic method for phosphorus-silicon-aluminum molecular sieve
A technology of SAPO-34 and synthesis method, applied in the field of molecular sieves, can solve the problems of long crystallization time, large energy consumption, and use of template agents, etc., and achieve the effect of improving selectivity
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[0034] The rapid synthesis method of phosphosilicate-aluminum SAPO-34 molecular sieve of the present invention, the specific steps are:
[0035] a) Prepare the initial gel mixture of SAPO-34 molecular sieve by proportioning template agent, phosphorus source, aluminum source, silicon source and water;
[0036] b) Add a metered amount of organic amine accelerator to the initial gel mixture obtained in step a), and stir to obtain a uniform initial gel mixture;
[0037] c) Put the homogeneous initial gel mixture obtained in step b) into a stainless steel synthesis kettle lined with polytetrafluoroethylene, airtight, and perform aging at room temperature to 180° C., and the aging time is 1 to 12 hours.
[0038] d) The aging mixture obtained in step c) is further heated to the crystallization temperature in an airtight manner, and constant-temperature crystallization is performed under autogenous pressure. The crystallization temperature is 180-250°C, and the crystallization time is 0.5...
Example Embodiment
[0043] Example 1 (SAPO-34 molecular sieve synthesis)
[0044] With the initial gel ratio of 3.0TEA: 0.6SiO 2 : P 2 O 5 : Al 2 O 3 :50H 2 O (TEA is triethylamine template agent) mix the metered raw materials in a certain order, stir fully to form a gel, age at 80°C for 5 hours, then put it into a stainless steel autoclave lined with PTFE, and heat it in a sealed manner To 200 ℃, under autogenous pressure, constant temperature crystallization for 5 hours. The solid product was separated by centrifugation, washed with deionized water to neutrality, and dried in the air at 120°C. XRD analysis is shown in Table 1. The synthesized product is SAPO-34 molecular sieve raw powder.
[0045] Table 1 X-ray diffraction analysis results of the synthesized sample in Example 1
[0046] 2θ
[0047] 20.52
Example Embodiment
[0048] Example 2 (SAPO-34 molecular sieve synthesis)
[0049] With the initial gel ratio of 2.5TEA: 0.6SiO 2 : P 2 O 5 : Al 2 O 3 :50H 2 O: 0.1 CTAB (TEA is triethylamine templating agent, CTAB is cetyl trimethyl ammonium bromide). Mix the metered raw materials in a certain order, stir fully to form a gel, and age at 100°C for 8 hours, then Put it into a stainless steel autoclave lined with polytetrafluoroethylene, heat it to 180°C in a sealed airtight, and crystallize at a constant temperature for 2 hours under autogenous pressure. The solid product was separated by centrifugation, washed with deionized water to neutrality, and dried in the air at 120°C. XRD analysis is shown in Table 2. The synthesized product is SAPO-34 molecular sieve raw powder.
[0050] Table 2 Example 2 X-ray diffraction analysis results of synthetic samples
[0051] 2θ
[0052] 12.76
PUM
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