A kind of preparation method and application of modified Y molecular sieve
A molecular sieve and modification technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as poor catalyst activity, low cracking activity, and poor nitrogen tolerance
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Embodiment 1
[0032] Molecular sieve modification process:
[0033] (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%;
[0034] (2) Hydrothermally treat the Y molecular sieve obtained in step (1) at 630°C and 0.15MPa for 2 hours;
[0035] (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.
[0036] (4) Dry the molecular sieve obtained in step (3) at 140°C for 8 minutes;
[0037] (5) Take the molecular sieve obtained in step (4) and place it in a clo...
Embodiment 2
[0041] Molecular sieve modification process:
[0042] (1) Take 200g of 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 exchanged Y molecular sieve Na content in Na 2 O is calculated as 2.0%;
[0043] (2) The molecular sieve obtained in step (1) was mixed with distilled water according to the liquid-solid ratio of 5:1, then, 100ml of ammonium fluorosilicate solution with a concentration of 1.0mol / L was added, and treated at 85°C for 1.0 hour;
[0044] (3) Hydrothermally treat the Y molecular sieve obtained in step (2) at 600°C and 0.1MPa for 3 hours;
[0045] (4) The molecular sieves treated in step (3) were dried at 130°C for 40 minutes;
[0046] (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;
[0047] (6) The...
Embodiment 3
[0050] Molecular sieve modification process:
[0051] (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%;
[0052] (2) The molecular sieve obtained in step (1) was mixed with distilled water according to the liquid-solid ratio of 5:1, then, 100ml of ammonium fluorosilicate solution with a concentration of 1.6mol / L was added, and treated at 75°C for 1.5 hours;
[0053] (3) Hydrothermally treat the Y molecular sieve obtained in step (2) at 540°C and 0.1MPa for 1.5 hours;
[0054] (4) The molecular sieve obtained in step (3) was stirred and mixed with distilled water according to the liquid-solid ratio of 7:1, and then the temperature was raised to 80°C. During the stirring process, 400ml of 0.5mol / L aluminum sulf...
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