SSZ-26 AND SSZ-33 - 2 MOLECULAR-SIEVES WITH INTERSECTING 10-RING AND 12-RING PORES

The framework structures of two closely related molecular sieves, SSZ- 26 and SSZ-33, are described. These materials possess a previously mis sing but desired structural feature in a group of industrially signifi cant zeolites. They contain a three-dimensional pore system that provi des access to the crystal interior through both 10- and 12-rings. This property is a consequence of the organic structure-directing agents u sed in the synthesis of these materials. These materials are examples of the purposeful design of a micropore architecture. Both SSZ-26 and SSZ-33 contain the 4=4-1 building unit that had been previously found only in natural zeolites.