Preparation method of ZSM-5 molecular sieve material, and ZSM-5 molecular sieve material prepared by the method
A technology of ZSM-5 and molecular sieve, which is applied in the direction of molecular sieve catalysts, double decomposition reaction hydrocarbon production, chemical instruments and methods, etc., can solve the problems of limited source of raw materials, complicated preparation process, high cost, etc., and achieve simple process flow, wide sources, low cost effect
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[0031] According to the first aspect of the present invention, the present invention provides a kind of preparation method of ZSM-5 molecular sieve material, and the method comprises the following steps:
[0032] (1) refluxing a mixture to obtain a primary gel, the mixture containing a silicon source, an alkali, water and an optional aluminum source;
[0033] (2) The primary gel is mixed with a structure directing agent, and the silicon source is SiO 2 In terms of the aluminum source as Al 2 o 3 Calculated, the base is calculated as an oxide, and the molar ratio of aluminum source, silicon source, base, structure directing agent and water is 0-10 (preferably 1-8): 200: 2-8: 10-20: 10000- 30000;
[0034] (3) the mixture obtained in step (2) is mixed with polyethylene glycol;
[0035] (4) the mixture obtained in step (3) is subjected to hydrothermal crystallization;
[0036] (5) Separating the mixture obtained by hydrothermal crystallization into solid and liquid, drying an...
Embodiment 1
[0065] Add water glass, sodium aluminate, sodium hydroxide and deionized water into a three-necked flask, and stir and reflux in an oil bath at 75°C for 24 hours. Then, tetrapropylammonium bromide was added into the three-necked flask as a structure-directing agent, and the stirring reaction was continued at room temperature (25° C.) for 4 hours. Among them, Al 2 o 3 Sodium aluminate in terms of SiO 2 water glass in terms of Na 2 The molar ratio of sodium hydroxide, tetrapropylammonium bromide and water in terms of O is 5:200:5:15:20000. Next, add polyethylene glycol (the number average molecular weight is 2000, and the weight ratio of polyethylene glycol to water is 1:1) into the three-necked flask, and stir at room temperature (25° C.) for 4 hours to form a uniform sol. The obtained sol was put into a closed reaction kettle, and crystallized at 165° C. for 48 hours. Filter the mixture obtained by crystallization, wash the obtained solid with deionized water at room temp...
Embodiment 2
[0077] Add water glass, sodium aluminate, sodium hydroxide and deionized water into a three-necked flask, and stir and reflux in an oil bath at 75°C for 24 hours. Then, tetrapropylammonium bromide was added into the three-necked flask as a structure-directing agent, and the stirring reaction was continued at room temperature (25° C.) for 4 hours. Among them, Al 2 o 3 Sodium aluminate in terms of SiO 2 water glass in terms of Na 2 The molar ratio of sodium hydroxide, tetrapropylammonium bromide and water in terms of O is 3:200:5:15:20000. Next, add polyethylene glycol (the number average molecular weight is 2000, and the weight ratio of polyethylene glycol to water is 1:1) into the three-necked flask, and stir at room temperature (25° C.) for 4 hours to form a uniform sol. The obtained sol was put into a closed reaction kettle, and crystallized at 165° C. for 48 hours. Filter the mixture obtained by crystallization, wash the obtained solid with deionized water at room temp...
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