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Pillaring of synthetic hectorite by mixed [Al13-xFex] Pillars

Published online by Cambridge University Press:  09 July 2018

F. Bergaya
Affiliation:
CRMD-CNRS, 1B rue de la Férollerie, 45071 Orléans Cédex 02
N. Hassoun
Affiliation:
CRMD-CNRS, 1B rue de la Férollerie, 45071 Orléans Cédex 02
J. Barrault
Affiliation:
Laboratoire de catalyse en Chimie Organique, URA 350, CNRS, 40 Avenue du Recteur Pineau, 86022 Poitiers Cédex, France
L. Gatineau
Affiliation:
CRMD-CNRS, 1B rue de la Férollerie, 45071 Orléans Cédex 02

Abstract

The pillaring of a Laponite by alumina pillars, iron pillars and mixed Al-Fe pillars was obtained by a simple in situ method starting from AlCl3 and/or FeCl3 solutions with different molar ratio Fe/(Fe + Al), and from NaOH solution added simultaneously to the clay suspension. The Al13 pillars were evidenced by XRD and NMR spectra. The density and the charge of these pillars were calculated from the chemical analysis. The Fe pillars (in samples with Fe content >26%) are larger than Al13 pillars and slowly reducible by hydrogen temperature programmed reduction (H2TPR), but we do not have any information on their structure. There is also an excess of non-pillar Fe retained by the pillared clays probably as oxyhydroxides. The isomorphic substitution in the mixed (Al-Fe)13 pillars (in samples with an Fe content >26%) was evidenced by H2TPR results compared to the chemical analyses and by the interpretation of the 27A1 peaks in the NMR spectra.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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