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Published April 23, 1997 | Supplemental Material
Journal Article Open

A Model for the Structure of the Large-Pore Zeolite SSZ-31

Abstract

A model for the structure of the zeolite SSZ-31 is presented. The model is obtained by combining information from adsorption capacity measurements, transmission electron microscopy, and high-resolution X-ray diffraction. SSZ-31 is a one-dimensional large-pore zeolite with a framework density of 18.7 tetrahedral(T)-atoms per nm^(-3) and a bulk density of 1.87 g cm^(-3). The pore apertures are elliptical with major and minor axes of approximately 8.6 Å × 5.7 Å. SSZ-31 is an extreme example of a complex and highly faulted zeolite. The structure can be described as an intergrowth of four different but structurally related polymorphs.

Additional Information

© 1997 American Chemical Society. Received November 12, 1996. Publication Date (Web): April 23, 1997. We thank P. Wagner (CIT) who helped to obtain several of the in-house XRD patterns of SSZ-31 and Y. Nakagawa and L. T. Yuen (Chevron) for the synthesis of several of the samples of SSZ-31 used in this work. R. C. Medrud (Chevron) helped to obtain the synchrotron XRD pattern of SSZ-31. 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 Materials Sciences and Division of Chemical Sciences. R.F.L. is grateful to the University of Delaware Research Foundation and to Chevron Research and Technology for financial support. M.T. is grateful to the David and Lucile Packard Foundation for a Fellowship in Science and Engineering and to the National Center for Electron Mcroscopy for a NCEM/DOE Fellowship. We thank the W. M. Keck Polymer Morphology Laboratory for use of EM facilities.

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