Zeolite synthesis with a fluoride source
Provided are novel synthesis techniques for producing pure phase aluminosilicate zeolite and a catalyst comprising the phase pure zeolite in combination with a metal, and methods of using the same.
1. An aluminosilicate zeolite comprising at least about 90% phase pure CHA framework and the aluminosilicate zeolite has an FT-IR spectrum according to FIG. 10 .
2. The aluminosilicate zeolite of claim 1 , wherein the aluminosilicate zeolite has at least about 95% phase pure CHA framework.
3. An aluminosilicate zeolite comprising at least about 95% phase pure CHA framework, wherein the aluminosilicate zeolite, according to its FT-IR spectrum, has an intensity ratio of less than about 5 between frequencies of about 3730 cm −1 and about 1870 cm −1 .
4. The aluminosilicate zeolite of claim 3 , wherein the aluminosilicate zeolite has the intensity ratio ranges of about 1:10 to about 5:1 between frequencies of about 3730 cm −1 and about 1870 cm −1 .
5. The aluminosilicate zeolite of claim 3 , wherein the aluminosilicate zeolite has a mean crystal size of less than about 3 μm.
6. The aluminosilicate zeolite of claim 3 , wherein the aluminosilicate zeolite has an SAR of about 20 to about 500.
7. The aluminosilicate zeolite of claim 3 , wherein the aluminosilicate zeolite is substantially free of alkaline metal.
8. A method for storing NO x comprising contacting an exhaust gas stream containing NO x with an aluminosilicate zeolite of claim 3 .
9. A method for selectively reducing NO x comprising contacting an exhaust gas stream containing NOx with an aluminosilicate zeolite of claim 3 .
10. A method for oxidizing a component of an exhaust gas comprising contacting an exhaust gas stream containing the component with an aluminosilicate zeolite of claim 3 , wherein the component is selected from CO, hydrocarbon, and NH 3 .