US 12,319,582 B2
Method of making AEI-type zeolites having a high silica to alumina molar ratio (SAR)
Yunkui Li, Ann Arbor, MI (US); De Gao, Troy, MI (US); David Shepard, Canton, MI (US); Wei Wu, Ann Arbor, MI (US); Jeffery Lachapelle, Northville, MI (US); and Geng Zhang, Utsunomiya (JP)
Assigned to Pacific Industrial Development Corporation, Ann Arbor, MI (US)
Appl. No. 17/290,794
Filed by Pacific Industrial Development Corporation, Ann Arbor, MI (US)
PCT Filed Nov. 4, 2019, PCT No. PCT/US2019/059611
§ 371(c)(1), (2) Date May 3, 2021,
PCT Pub. No. WO2020/096935, PCT Pub. Date May 14, 2020.
Claims priority of provisional application 62/755,598, filed on Nov. 5, 2018.
Prior Publication US 2021/0403334 A1, Dec. 30, 2021
Int. Cl. C01B 39/48 (2006.01)
CPC C01B 39/48 (2013.01) [C01P 2002/72 (2013.01); C01P 2004/03 (2013.01); C01P 2006/12 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of making an AEI-type zeolite, the method comprising the steps of:
a) providing a source of silica;
b) providing a source of alumina;
c) providing an organic structure directional agent (OSDA); the ratio of the OSDA to silica being in the range of 0.05 to 0.13:
d) providing a source of alkali metal ions;
e) providing a zeolite seed;
f) mixing the source of silica and alumina with the OSDA, the alkaline metal ions, and the zeolite seed in water to form a gel composition;
g) heating the gel composition to a crystallization temperature that is in the range of about 135° C. to about 200° C.;
h) maintaining the gel composition at the crystallization temperature for a time period that ranges from 10 hours to 168 hours;
i) allowing the AEI-type zeolite to crystallize and precipitate; the gel composition forming a crystalline precipitate of the AEI-type zeolite and a mother liquid; and
j) separating the crystalline precipitate from the mother liquid;
wherein the AEI-type zeolite has a silica to alumina (SiO2:Al2O3) molar ratio of at least 15:1;
wherein the source of alumina is in the form of a FAU zeolite NaY that has a silica to alumina (SiO2:Al2O3) molar ratio of ≤5, a Y zeolite that has a silica to alumina (SiO2:Al2O3) molar ratio >5, or a combination thereof;
wherein a portion of the source of silica is derived from the source of alumina, while the remainder of the source of silica includes one selected from sodium silicate, silica sol, fumed silica, tetraethyl orthosilicate, or a mixture thereof.