US 12,304,824 B2
Methods of synthesis of mesoporous nano-sized beta zeolites by desilication and uses thereof
Lianhui Ding, Dhahran Camp (SA); and Sameer Al-Ghamdi, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Jan. 6, 2022, as Appl. No. 17/570,092.
Prior Publication US 2023/0212019 A1, Jul. 6, 2023
Int. Cl. C01B 39/46 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01); C10G 47/02 (2006.01)
CPC C01B 39/46 (2013.01) [C10G 47/02 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C01P 2004/64 (2013.01); C01P 2006/16 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for synthesizing a nano-sized mesoporous zeolite beta composition, comprising:
mixing silica, a source of aluminum, tetraethylammonium hydroxide, and water to form an aluminosilicate fluid gel;
heating the aluminosilicate fluid gel at a first temperature for a first time period to form a zeolite beta product;
mixing the zeolite beta product with aqueous ammonia to form an ammonia-zeolite mixture without a structure directing agent (SDA), wherein the mass ratio of ammonia to silica is 10;1 to 20:1;
heating the ammonia-zeolite mixture at a second temperature for a second time period to form a treated zeolite beta product, wherein the second temperature is in the range of 50° C. to 200° C. and the second time period is 5 to 10 hours;
filtering the treated zeolite beta product;
washing the treated zeolite beta product after the filtering;
drying the treated zeolite beta at a third temperature for a third time period after the washing; and
calcinating the treated zeolite beta product at a fourth temperature for a fourth time period after the drying to produce the nano-sized mesoporous zeolite beta composition, wherein the nano-sized mesoporous zeolite beta composition has a relative crystallinity of 90% to 120% and a pore volume of 1.2 milliliters per gram (ml/g) to 1.5 ml/g.