High silica AEI zeolite
Provided are a novel form of AEI zeolite, a novel synthesis technique for producing pure phase AEI zeolite, a catalyst comprising the AEI zeolite in combination with a metal, and methods of using the same. The AEI aluminosilicate zeolite has a cuboid morphology and a silica-to-alumina ratio of 20 to 50.
1. An aluminosilicate zeolite comprising at least about 90% phase pure AEI framework, wherein the aluminosilicate zeolite has a cuboid morphology, wherein the aluminosilicate zeolite has a silica-to-alumina ratio of 20 to 50.
2. The aluminosilicate zeolite of claim 1 , wherein the aluminosilicate zeolite is substantially free of extra framework phosphorus.
3. The aluminosilicate zeolite of claim 1 , wherein the aluminosilicate zeolite has a mean crystal size of at, least about 100 urn.
4. The aluminosilicate zeolite of claim 1 , wherein the aluminosilicate zeolite has a D 90 crystal size of about 0.1 μm to about 7 μm.
5. The aluminosilicate zeolite of claim 1 , wherein the aluminosilicate zeolite comprises at least about 95% phase pure AEI framework.
6. The aluminosilicate zeolite of claim 1 , wherein the aluminosilicate zeolite is substantially free of medium and large pore frameworks.
7. The aluminosilicate zeolite of claim 1 , wherein the aluminosilicate zeolite is substantially free of FAU framework.
8. The aluminosilicate zeolite of claim 1 , wherein the aluminosilicate zeolite further comprises an alkaline earth metal.
9. The aluminosilicate zeolite of claim 1 , wherein the aluminosilicate zeolite has a silica-to-alumina ratio of about 25 to about 50.
10. The aluminosilicate zeolite of claim 1 , wherein the aluminosilicate zeolite has a silica-to-alumina ratio of about 25 to about 30.