ZSM-5 structure zeolite, preparation and use thereof
A ZSM-5 and zeolite technology, applied in the field of ZSM-5 structure zeolite, can solve the problems of difficulty in filtration/separation, increased difficulty in industrial production and application, etc., to solve the difficulty of filtration, solve the difficulty of separation between catalyst and liquid phase, and achieve good conversion. rate effect
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Embodiment 1
[0021] This example illustrates the preparation of the zeolites provided by the invention.
[0022] Get 50 grams of commercially available ZSM-5 zeolite (commercial brand is ZRP-5, SiO 2 / Al 2 o 3 =60, primary particle diameter is 3μm, mesopore surface area is 8m 2 / g), put into 2 liters of concentration and be in the sodium hydroxide aqueous solution of 0.5 mole (record pH=11). Stir at a constant temperature of 80°C for 3 hours under reflux, filter, rinse with 100 ml of deionized water, exchange with 500 ml of 1 molar ammonium nitrate solution at a constant temperature of 90°C for 1 hour, filter, repeat the ammonium exchange once, filter, and The filter cake was dried at 110°C for 5 hours and calcined at 500°C for 3 hours.
[0023] The resulting zeolite product is designated as T1. Its SiO 2 / Al 2 o 3 = 41, the primary particle diameter measured by the electron microscope is 2.7 μm, and the mesopore surface area measured by the BET low-temperature nitrogen adsorption ...
Embodiment 2
[0032] This example illustrates the preparation of the zeolites provided by the invention.
[0033] Get 40 grams of commercially available ZSM-5 zeolite (commercial brand is ZRP-5, SiO 2 / Al 2 o 3 =60, primary particle diameter is 3μm, mesopore surface area is 8m 2 / g), put into 2 liters of concentration and be 0.5 mole sodium hydroxide aqueous solution (recording PH=11), under reflux at 85 ℃ of constant temperature stirring 2 hours, filter, rinse with 100 milliliters of deionized water, then use 500 ml of 1 molar ammonium nitrate solution was exchanged at 90°C for 1 hour at a constant temperature, filtered, repeated ammonium exchange once, filtered, and the filter cake was dried at 110°C for 5 hours and then roasted at 500°C for 3 hours.
[0034] The resulting zeolite product is designated as T2. Its SiO 2 / Al 2 o 3 =37, the primary particle diameter measured by the electron microscope is 2.5 μm, and the mesopore surface area measured by the BET low-temperature nitroge...
Embodiment 3
[0036] This example illustrates the preparation of the zeolites provided by the invention.
[0037] Get 20 grams of commercially available ZSM-5 zeolite (commercial brand is ZRP-5, SiO 2 / Al 2 o 3 =60, primary particle diameter is 3μm, mesopore surface area is 8m 2 / g), put into 3 liters of concentration and be 0.8 moles of sodium hydroxide aqueous solution (record pH=11.8), under reflux at 80 ℃ of constant temperature and stir for 1.5 hours, filter, rinse with 100 milliliters of deionized water, then use 500 ml of 1 molar ammonium nitrate solution was exchanged at 90°C for 1 hour at a constant temperature, filtered, repeated ammonium exchange once, filtered, the filter cake was dried at 110°C for 5 hours, and then roasted at 500°C for 3 hours.
[0038] The resulting zeolite product is designated as T3. Its SiO 2 / Al 2 o 3 =30, the primary particle diameter measured by the electron microscope is 2.1 μm, and the mesopore surface area measured by the BET low-temperature ni...
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