The Framework Topology of ZSM-18, a Novel Zeolite Containing Rings of Three (Si,Al)-O Species
- 16 March 1990
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 247 (4948), 1319-1322
- https://doi.org/10.1126/science.247.4948.1319
Abstract
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.Keywords
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