Modified Y molecular sieve and preparation method thereof
A molecular sieve and modification technology, applied in molecular sieve catalysts, chemical instruments and methods, hydrocarbon oil cracking, etc., can solve the problems of increased secondary cracking in the heating process, poor sensitivity of catalysts to heating, and increased hydrogen consumption, etc., to achieve wide application foreground effect
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Embodiment 1
[0031] Molecular sieve modification process:
[0032] (1) Take 200g of NaY molecular sieve raw powder prepared in the laboratory, mix it with ammonium nitrate with a concentration of 0.5mol / L according to the liquid-solid ratio of 3:1, exchange at 70°C for 3 hours, repeat this process 3 times, and the exchanged Y molecular sieve Na content in Na 2 O is calculated as 2.5%;
[0033] (2) Hydrothermally treat the Y molecular sieve obtained in step (1) at 560°C and 0.1MPa for 2 hours;
[0034] (3) The molecular sieve obtained in step (2) was stirred and mixed with distilled water according to the liquid-solid ratio of 5:1, and then the temperature was raised to 80°C. During the stirring process, 400ml of 0.5mol / L aluminum sulfate solution was added, and the reaction was carried out at constant temperature for 2 hours.
[0035] (4) Dry the molecular sieve obtained in step (3) at 140°C for 8 minutes;
[0036] (5) Take the molecular sieve obtained in step (4) and place it in a clos...
Embodiment 2
[0040] Molecular sieve modification process:
[0041] (1) Take the NaY molecular sieve raw powder prepared in the laboratory, mix it with ammonium nitrate with a concentration of 0.8mol / L according to the liquid-solid ratio of 3:1, exchange at 70°C for 3 hours, repeat this process 3 times, and the Y molecular sieve after exchange Na content in Na 2 O is calculated as 2.0%.
[0042] (2) Hydrothermally treat the Y molecular sieve obtained in step (1) at 600°C and 0.1MPa for 3 hours;
[0043] (3) The molecular sieve obtained in step (2) is mixed with H at a liquid-solid ratio of 7:1 + A mixed solution of hydrochloric acid with a concentration of 1.0mol / L was mixed and treated at 95°C for 2 hours;
[0044] (4) The molecular sieve obtained in step (3) was dried at 250°C for 2 hours;
[0045] (5) Soak the molecular sieve obtained in step (4) in toluene solvent for 3 hours;
[0046] (6) The molecular sieve treated in step (5) was dried at 130°C for 25 minutes;
[0047] (7) The ...
Embodiment 3
[0050] Molecular sieve modification process:
[0051] (1) Take the NaY molecular sieve raw powder prepared in the laboratory, mix it with ammonium nitrate with a concentration of 0.8mol / L according to the liquid-solid ratio of 3:1, exchange at 70°C for 3 hours, repeat this process 3 times, and the Y molecular sieve after exchange Na content in Na 2 O is calculated as 2.0%.
[0052] (2) Hydrothermally treat the Y molecular sieve obtained in step (1) at 520°C and 0.1MPa for 3 hours;
[0053] (3) Step (2) sieve the citric acid solution (concentration in H + Meter) mixed, then heated to 50 ° C, constant temperature reaction for 2 hours;
[0054] (4) The molecular sieves treated in step (3) were dried at 130°C for 40 minutes;
[0055] (5) soak the molecular sieve obtained in step (4) in heptene for 4 hours, and then heat at 180°C for 30 hours in an air atmosphere;
[0056] (6) The molecular sieve obtained in step (5) is mixed with H at a liquid-solid ratio of 7:1 + A mixed so...
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