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Science 16 March 1990:
Vol. 247. no. 4948, pp. 1319 - 1322
DOI: 10.1126/science.247.4948.1319
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Articles

The Framework Topology of ZSM-18, a Novel Zeolite Containing Rings of Three (Si,Al)-O Species

Stephen L. Lawton 1 and Wayne J. Rohrbaugh 1

1 Research Department, Mobil Research and Development Corporation, Paulsboro, NJ 08066

ZSM-18 is the first known aluminosilicate zeolite to contain rings of three (Si,Al)-O species (3-rings). Its framework topology has been determined by hypothetical model building, subsequent constrained distance and angle least-squares refinements of atomic coordinates, and x-ray powder diffraction pattern simulations. Its channel structure is characterized by a linear unidimensional 12-ring channel, with an approximate pore opening of 7.0 angstroms. In addition, the channels are lined with pockets that are capped by 7-rings with dimensions of 2.8 angstroms by 3.5 angstroms. An intraframework packing model of the organic moiety used in the synthesis suggests that a strong templating effect may be responsible for the formation of this unusual zeolite structure.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
MCM-22: A Molecular Sieve with Two Independent Multidimensional Channel Systems.
M. E. Leonowicz, J. A. Lawton, S. L. Lawton, and M. K. Rubin (1994)
Science 264, 1910-1913
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