Zeolite SSZ-70 having enhanced external surface area

摘要

A method is disclosed for preparing zeolite SSZ-70 using an imidazolium cation as a structure directing agent in conjunction with a polyethyleneimine modifier. The SSZ-70 zeolite is characterized as having an external surface area larger than conventional SSZ-70 zeolites.

主权项

1. A method for preparing zeolite SSZ-70, comprising contacting under crystallization conditions (1) at least one source of at least one oxide of a tetravalent element; (2) optionally, one or more sources of one or more oxides selected from the group consisting of oxides of trivalent elements, pentavalent elements, and mixtures thereof; (3) optionally, at least one source of an element selected from Groups 1 and 2 of the Periodic Table; (4) at least one source of a mineralizing agent selected from hydroxide ions and fluoride ions; (5) an imidazolium cation selected from the group consisting of a 1,3-diisopropylimidazolium cation, a 1,3-diisobutylimidazolium cation, and a 1,3-dicyclohexylimidazolium cation; and (6) a polyethyleneimine,wherein the zeolite has, after calcination to remove any organic material, an external surface area of at least 55 m2/g.