US 12,030,040 B2
Method for synthesizing mesoporous nano-sized ultra-stable Y zeolite
Faisal Alotaibi, Al Khobar (SA); and Lianhui Ding, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Nov. 29, 2022, as Appl. No. 18/059,733.
Prior Publication US 2024/0173702 A1, May 30, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. B01J 29/08 (2006.01); B01J 35/23 (2024.01); B01J 35/61 (2024.01); B01J 35/63 (2024.01); B01J 35/64 (2024.01); B01J 37/00 (2006.01); B01J 37/04 (2006.01); B01J 37/08 (2006.01); B01J 37/30 (2006.01); C01B 39/08 (2006.01); C01B 39/24 (2006.01)
CPC B01J 29/084 (2013.01) [B01J 35/23 (2024.01); B01J 35/617 (2024.01); B01J 35/633 (2024.01); B01J 35/647 (2024.01); B01J 37/009 (2013.01); B01J 37/04 (2013.01); B01J 37/08 (2013.01); B01J 37/30 (2013.01); C01B 39/08 (2013.01); C01B 39/24 (2013.01); B01J 2029/081 (2013.01); B01J 2229/16 (2013.01); B01J 2229/32 (2013.01); C01P 2004/64 (2013.01); C01P 2006/12 (2013.01); C01P 2006/14 (2013.01); C01P 2006/16 (2013.01)] 18 Claims
 
1. A method for synthesizing a mesoporous nano-sized ultra-stable Y zeolite, the method comprising:
preparing a 0.1 to 2.0 M ammonium hexafluorosilicate solution;
preparing a 0.1 to 2.0 M ammonium hydroxide solution;
combining a microporous nano-sized Y zeolite having a SiO2/Al2O3 molar ratio of less than 5.2 with 30 to 1,000 milliliters water per gram of the microporous Y zeolite on a dry basis to form a microporous Y zeolite slurry and heating the microporous Y zeolite slurry to 30° C. to 100° C. to form a heated microporous Y zeolite slurry;
adding the ammonium hexafluorosilicate solution and the ammonium hydroxide solution in a drop-wise manner to the heated microporous Y zeolite slurry to form a treated zeolite solution;
holding the treated zeolite solution at 50° C. to 100° C. with stirring for a period of 1 to 24 hours;
filtering and washing the treated zeolite solution with water to form an ultra-stable Y zeolite precursor;
drying the ultra-stable Y zeolite precursor at 80° C. to 150° C. for 6 to 24 hours to form a dried zeolite precursor; and
calcining the dried zeolite precursor at 250° C. to 600° C. for 1 to 8 hours to form the mesoporous nano-sized ultra-stable Y zeolite.