SSZ-26 and SSZ-33: Two Molecular Sieves with Intersecting 10- and 12-Ring Pores
Raul F. Lobo 1,
Ming Pan 2,
Ignatius Chan 3,
Hong-Xin Li 1,
Ronald C. Medrud 3,
Stacey I. Zones 3,
Peter A. Crozier 2, and
Mark E. Davis 1
1 Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
2 Center for Solid State Science, Arizona State University, Tempe, AZ 85287-1704
3 Chevron Research and Technology Company, Richmond, CA 94802-0627
The framework structures of two closely related molecular sieves, SSZ-26 and SSZ-33, are described. These materials possess a previously missing but desired structural feature in a group of industrially significant zeolites. They contain a three-dimensional pore system that provides access to the crystal interior through both 10- and 12-rings. This property is a consequence of the organic structure—directing agents used 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.
Submitted on July 7, 1993
Accepted on October 7, 1993
