| abstract |
A process for preparing a modified zeolite Y, comprising calcining a zeolite Y having a silica to alumina molar ratio of at least 10 at a temperature of 700 to 1,000 ° C., wherein (i) the vapor partial pressure is 0.06 bar or less at a temperature of 700 to 800 ° C. (ii) the steam partial pressure is 0.08 bar or less at a temperature of 800-850 ° C., (iii) the steam partial pressure is 0.03 bar or more at a temperature of 850-900 ° C., and (iv) at a temperature of 900-950 ° C. At least 0.05 bar, (v) a method of production with a vapor partial pressure of at least 0.07 bar at temperatures of 950-1000 ° C., modified zeolite Y obtainable by this method, a molar ratio of silica to alumina of at least 10, and an infrared spectrum of 3,700 cm in gajina a peak at 3,605 cm -1 and 3,670 cm -1 -1 is substantially zeolite Y, and a silica to alumina molar ratio that does not have a peak of more than 10, the acidity as determined by the exchange with the heavy hydrogenated benzene 20 μmol / g Servant zeolite Y. |