A kind of modification method of ZSM-5 molecular sieve outer surface
A ZSM-5, modification method technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the need for repeated operations, the modification process is cumbersome, and the preparation reproducibility is poor. and other problems, to achieve the effect of improving modification efficiency, reducing environmental pollution and cost, and simple process operation.
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Embodiment 1
[0033] Weigh 10.00g of hydrogen-type ZSM-5 molecular sieve powder (the molar ratio of silicon to aluminum in the molecular sieve is 200 SAR), and convert the mass of ZSM-5 molecular sieve powder to obtain SiO 2 The number of moles, both according to SiO 2 , The molar ratio of organic base, ammonium salt and water is 1:0.06:0.024:12 to prepare a mixed solution containing n-butylamine, ammonium chloride and water, and the molecular sieve is mixed with the solution and stirred evenly.
[0034] Transfer the formed molecular sieve slurry to a closed high-pressure crystallization kettle (100 mL), conduct self-pressure reaction at a constant temperature of 170 ° C for 24 hours, and then cool to room temperature, filter the reacted molecular sieve slurry to obtain a modified molecular sieve filter cake, and after many After washing twice with water, drying at 90°C overnight and calcining at 550°C for 5 hours, the modified ZSM-5 molecular sieve was finally obtained, and the catalyst wa...
Embodiment 2
[0036] Weigh 10.00g of hydrogen-type ZSM-5 molecular sieve powder (SAR=200), and convert the content of ZSM-5 molecular sieve powder to obtain SiO 2 The number of moles, both according to SiO 2 , The molar ratio of organic base, ammonium salt and water is 1:0.12:0.024:6 to prepare a mixed solution containing n-butylamine, ammonium chloride and water, and the molecular sieve is mixed with the solution and stirred evenly. Transfer the formed molecular sieve slurry to a closed high-pressure crystallization kettle (100 mL), conduct self-pressure reaction at a constant temperature of 150° C. for 48 hours, then cool to room temperature, filter the reacted molecular sieve slurry to obtain a modified molecular sieve filter cake, and after many After washing twice with water, drying at 90°C overnight and calcining at 550°C for 5 hours, the modified ZSM-5 molecular sieve was finally obtained, and the catalyst was labeled as ZSM-5-P2.
Embodiment 3
[0038] Weigh 10.00g hydrogen-type ZSM-5 molecular sieve powder (SAR=200), and convert the mass of ZSM-5 molecular sieve powder to obtain SiO 2 The number of moles, both according to SiO 2 , the molar ratio of organic base, ammonium salt and water is 1:0.18:0.048:18 to prepare a mixed solution containing ethylenediamine, tetraethylammonium bromide and water, and the molecular sieve is mixed with the solution and stirred evenly. Transfer the formed molecular sieve slurry to a closed high-pressure crystallization kettle (100 mL), conduct self-pressure reaction at a constant temperature of 170 ° C for 24 hours, and then cool to room temperature, filter the reacted molecular sieve slurry to obtain a modified molecular sieve filter cake, and after many After washing twice with water, drying at 90°C overnight and calcining at 550°C for 5 hours, the modified ZSM-5 molecular sieve was finally obtained, and the catalyst was labeled as ZSM-5-P3.
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