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Published November 17, 1994 | public
Journal Article Open

Physicochemical Characterization of Zeolites SSZ-26 and SSZ-33


Detailed characterization of zeolites SSZ-26 and SSZ-33 is presented and includes data from adsorption experiments, X-ray powder diffraction (XRD), electron diffraction (ED), and high-resolution electron microscopy (HREM). Simulated XRD patterns and HREM images of the proposed structures agree very well with all the experimental data. These zeolites are the first synthetic high-silica molecular sieves to contain a three-dimensional pore system comprised of intersecting 10- and 12-ring pores. The structures of SSZ-26 and SSZ-33 are compared to the structures of known zeolites, and the relationships between the geometry of the structure-directing agents used in the synthesis of SSZ-26 and the geometry of the pores are analyzed using energy minimization calculations. Several hypothetical zeolite structures are derived based on the proposed models for SSZ-26 and SSZ-33. SSZ-26 and SSZ-33 are the first examples of molecular sieves whose multidimensional pore systems have been formed by the purposeful design of their structure-directing agents.

Additional Information

© 1994 American Chemical Society. Received: June 4, 1994; In Final Form: August 29, 1994. We are grateful to Chevron Research and Technology Company for financial support. We acknowledge D. E. Cox for assistance in collecting the synchrotron data. The XRD data were collected at X7 A beam line, National Synchrotron Light Source, Brookhaven National Laboratory, which is supported by the U.S. 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 Co. 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 performed at the Center for HREM at ASU supported by NSF Grant DMR-9115680.

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Supplemental Material - j100097a033_si_001.pdf


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August 20, 2023
August 20, 2023