Patent ID: 8148285

Claim:
A method for manufacturing a zeolite Y with aluminum and titanium inserted therein, the method comprising: preparing an ultra-stable zeolite Y (USY) with a unit cell dimension (UD) in a range from 24.25 to 24.60 Å by ion-exchanging an NaY-type synthetic zeolite with ammonium ion followed by heating the NaY-type synthetic zeolite in steam; processing the USY with an acidic aqueous solution containing titanium at pH 1.5 or lower followed by filtering, washing, and drying the USY to remove aluminum from a frame structure of a zeolite of the USY, thereby preparing a titanium-inserted zeolite Y having the titanium inserted to the frame structure of the zeolite; and reinserting a part of the aluminum to the frame structure of the zeolite by suspending the titanium-inserted zeolite Y in an acidic or neutral aqueous solution at 100° C. to 200° C. for 3 to 30 hours followed by filtering, washing, and drying the suspended titanium-inserted zeolite Y, thereby forming an aluminum and titanium inserted zeolite Y, wherein the aluminum and titanium inserted zeolite Y has (a) a unit cell dimension (UD) in a range from 24.25 to 24.60 Å, (b) a crystallinity of 95% or more, (c) a specific surface area (SA) of 500 m 2 /g or more, (d) a total pore volume (PVt) of a group of pores each having a diameter of 600 Å or below in a range from 0.45 to 0.70 ml/g, (e) a pore volume (PVm) of a group of pores each having a diameter in a range from 100 to 600 Å in a range from 0.10 to 0.40 ml/g, (f) a pore volume (PVs) of a group of pores each having a diameter in a range from 35 to 50 Å in a range 0.03 to 0.15 ml/g, and (g) a percentage of 4-coordinate aluminum atoms against total aluminum atoms in the zeolite of 60 atom % or more.