SSZ-26 and SSZ-33: Two Molecular Sieves with Intersecting 10- and 12-Ring Pores

Creators: Lobo, Raul F.; Pan, Ming; Chan, Ignatius; Li, Hong-Xin; Medrud, Ronald C.; Zones, Stacey I.; Crozier, Peter A.; Davis, Mark E.

Abstract

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.

Additional Information

© 1993 American Association for the Advancement of Science. Received 7 July 1993; accepted 7 October 1993. We are grateful to Chevron Research and Technology Company for financial support. We thank W. P. Schaefer and R. E. Marsh for comments on the manuscript. We acknowledge D. E. Cox for assistance in collecting the synchrotron data. The XRD data were collected at X7A beam line, National Synchrotron Light Source, Brookhaven National Laboratory, which is supported by the Department of Energy, Division of Material Sciences and Division of Chemical Sciences. We also acknowledge the assistance of G. Zhang and G. Mondo, from Chevron Research and Technology Company, in collecting the synchrotron data. M.P. and P.A.C. were supported by the HREM Industrial Associates Program at Arizona State University. HREM work was done at the Center for HREM at Arizona State University supported by NSF grant DMR9115680.

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SSZ-26 and SSZ-33: Two Molecular Sieves with Intersecting 10- and 12-Ring Pores

Abstract

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