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Hypothetical Structures of Magadiite and Sodium Octosilicate and Structural Relationships Between the Layered Alkali Metal Silicates and the Mordenite- and Pentasil-Group Zeolites

Published online by Cambridge University Press:  02 April 2024

Juan M. Garcés ,
Stephen C. Rocke ,
Cyrus E. Crowder  and
Dennis L. Hasha
Juan M. Garcés
Affiliation:
Central Research IMCL, Dow Chemical Company, Midland, Michigan 48674
Stephen C. Rocke
Affiliation:
Central Research IMCL, Dow Chemical Company, Midland, Michigan 48674
Cyrus E. Crowder
Affiliation:
Analytical Laboratories, Dow Chemical Company, Midland, Michigan 48674
Dennis L. Hasha
Affiliation:
Analytical Laboratories, Dow Chemical Company, Midland, Michigan 48674
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Abstract

Hypothetical model structures for magadiite and sodium octosilicate, based on the structure of the zeolite dachiardite, are proposed that consist of layers of 6-member rings of tetrahedra and blocks containing 5-member rings attached to both sides of the layers. The infrared (IR) and nuclear magnetic resonance spectra of magadiite and sodium octosilicate have features in common with spectra of zeolites in the ZSM-5 and mordenite groups. A peak at 1225 cm-1 in the IR spectra of magadiite and sodium octosilicate is characteristic of zeolites containing 5-member rings, such as ZSM-5- and mordenite-type zeolites. The defect structures of pentasil zeolites may therefore be akin to layered alkali metal silicates containing zeolite-like domains, in which part of the silanol groups from adjacent silicate layers are condensed (cross-linked) forming siloxane linkages.

Keywords

Alkali metal silicateBikitaiteCrystal structureDachiarditeEpistilbiteInfrared spectroscopyMagadiiteMordeniteNuclear magnetic resonanceSodium octosilicateZeoliteZSM-5
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 5 , October 1988 , pp. 409 - 418
Copyright
Copyright © 1988, The Clay Minerals Society

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Footnotes

1

Presented at Symposium on the Geology, Genesis, Synthesis, and Use of Zeolites at 38th annual meeting of The Clay Minerals Society, Jackson, Mississipi, October 1986, convened by R. J. Donahoe. Manuscript reviewing and editing coordinated by R. J. Donahoe and R. A. Sheppard.

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