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FTIR Study of Deuterated Montmorillonites: Structural Features Relevant to Pillared Clay Stability

Published online by Cambridge University Press:  28 February 2024

Krishna Bukka ,
J. D. Miller  and
Joseph Shabtai
Krishna Bukka
Affiliation:
Department of Metallurgy and Metallurgical Engineering, University of Utah, Salt Lake City, Utah 84112-1183
J. D. Miller
Affiliation:
Department of Metallurgy and Metallurgical Engineering, University of Utah, Salt Lake City, Utah 84112-1183
Joseph Shabtai*
Affiliation:
Department of Fuels Engineering, University of Utah, Salt Lake City, Utah 84112-1183
*
1To whom correspondence should be addressed.
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Abstract

FTIR studies of six partially-deuterated montmorillonites (MS) reveal the presence of two O-D stretching bands, one between 2702–2728 cm-1 and another near 2680 cm-1. For homoionic (Li, Na, Mg, Ca, or La) Wyoming-type MS, the position of the higher frequency band, designated as (O-D)h, is between 2714–2728 cm-1, whereas for homoionic Cheto-type MS it is between 2702–2706 cm-1. The lower frequency band, designated as (O-D)1, is in the narrow range of 2674–2684 cm-1. Resolution of two corresponding O-H bands, appearing near 3670 and 3635 cm-1, was observed only after partial dehydroxylation of the smectites. The changes in the relative intensities of the two O-D stretching bands as a function of the smectite type and of the Lewis acidity (charge density) of the exchangeable ion were determined. For Wyoming-type MS, the intensity of the (O-D)h band is much lower than that of the (O-D)l band, whereas for Cheto-type MS, the intensity of the (O-D)h band is about equal or slightly higher than that of the (O-D)l band. The observed resolution can be ascribed tentatively to the presence of (at least) two types of octahedral OH groups in the smectites, the (O-D)h band being assigned to AlMgOH and the (O-D)1 band to AlAlOH groups. Pillaring of Cheto-type MS with hydroxy-Al13 oligocations resulted in products showing much higher thermal stability between 400–600°C compared to that of identically pillared Wyoming-type MS. Compositional and other factors, e.g., CEC values and mode of pillaring, may cause this difference in stability.

Keywords

Deuterated montmorillonitesFITRPillared smectitesThermal stability
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 1 , February 1992 , pp. 92 - 102
Copyright
Copyright © 1992, The Clay Minerals Society

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