| abstract |
In the absence of any FAU zeolite Y, hydrogen fluoride (HF) is not used, and a method of producing an AEI zeolite by hydrothermal synthesis is provided. When this method is used, the resulting gel composition comprises at least one source of silica, at least one source of alumina, at least one organic structure directing agent (OSDA), a source of alkali metal ions, and water. This gel composition has a molar ratio, that is, SiO 2 /Al 2 O 3 16:1 to 100:1; M 2 O/SiO 2 0.15:1 to 0.30:1; ROH/SiO 2 0.05:1 to 0.20:1; And H 2 O/SiO 2 5:1 to 20:1 [wherein M is an alkali metal ion and R is an organic group derived from OSDA]. This gel composition is a crystalline AEI zeolite showing a ratio of silica to alumina greater than 8:1 (SiO 2 :Al 2 O 3 ) after reacting for 15 to 168 hours at a temperature between 135°C and about 180°C. Is created with. |