Solid state NMR characterisation of the thermal transformation of Fuller's Earth

Drachman, S.R. and Roch, G.E. and Smith, M.E. (1997) Solid state NMR characterisation of the thermal transformation of Fuller's Earth. Solid State Nuclear Magnetic Resonance, 9 (2-4). pp. 257-267. ISSN 0926-2040. (The full text of this publication is not available from this repository)

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Abstract

Fuller's Earth, a dioctahedral calcium montmorillonite clay mineral of the smectite group, undergoes thermal transformation via a series of complex intermediate states that are highly structurally disordered. Fuller's Earth is a commercially significant material with considerable levels of paramagnetic iron (Fe3+) substitution into octahedrally coordinated metal sites. Despite the high iron-content (similar to 10% of the occupied octahedral metal sites) in these samples Si-29 and Al-27 magic angle spinning (MAS) NMR spectra of sufficient quality are obtained to reveal structural changes in samples that have been heated from room temperature to 1400 degrees C. Two major structural changes are clearly observed, initial dehydroxylation and then collapse of the layer structure into more highly connected silica-rich domains and an alumina-rich phase. (C) 1997 Elsevier Science B.V.

Item Type: Article
Uncontrolled keywords: thermal transformation; Fuller's Earth; dehydroxylation; NMR
Depositing User: T. Nasir
Date Deposited: 24 Oct 2009 08:24
Last Modified: 24 Oct 2009 08:24
Resource URI: http://kar.kent.ac.uk/id/eprint/18410 (The current URI for this page, for reference purposes)
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