| abstract |
A method of forming AEI type zeolite without using hydrogen fluoride (HF) in hydrothermal synthesis and in the absence of any FAU type zeolite Y. The gel composition formed using the method includes: one or more sources of silica, one or more sources of alumina, one or more organic structure directing agents (OSDA), sources of alkali metal ions, and water. The gel composition is defined by the following molar ratios: SiO2 / Al2O3 from 16: 1 to 100:1, M2O / SiO2 from 0.15:1 to 0.30:1, ROH/ SiO2 from 0.05:1 1 to 0.20:1, and H2O / SiO2 from 5:1 to 20:1; wherein M is the alkali metal ion, and R is the organic moiety derived from the OSDA. After the gel composition is reacted at a temperature of 135°C to about 180°C for 15 to 168 hours, a crystalline AEI-type zeolite having a silicon to aluminum ratio (SiO 2 :Al 2 O 3 ) of greater than 8:1 is formed. |