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Influence of the Ti precursor on the properties of Ti–pillared smectites

Published online by Cambridge University Press:  09 July 2018

M. A. Vicente ,
M. A. Bañares-Muñoz ,
R. Toranzo ,
L. M. Gandía  and
A. Gil
M. A. Vicente*
Affiliation:
Departamento de Química Inorgánica, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain
M. A. Bañares-Muñoz
Affiliation:
Departamento de Química Inorgánica, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain
R. Toranzo
Affiliation:
Departamento de Química Inorgánica, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain
L. M. Gandía
Affiliation:
Departamento de Química Aplicada, Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain
A. Gil
Affiliation:
Departamento de Química Aplicada, Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain
*
*E-mail: mavicente@gugu.usal.es
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Abstract

The pillaring of smectites (two saponites and a montmorillonite) with various Ti precursors was studied. The minerals were intercalated with ‘classical ’ Ti precursors, such as titanium tetrachloride and titanium tetraethoxide, and also with new precursors, such as solutions of titanium tetraisopropoxide in acetic acid, or titanium (bis (ethylacetoacetato) diisopropoxide) in acetone. A complete characterization of the intercalated solids was carried out and a comparison of the properties of the solids as a function of the precursors used in the intercalation established. The influence of the severe conditions in which the intercalation with Ti oligomers is usually carried out (low pH and/or high temperature) on the properties of the intercalated solids was analysed. Intercalation with TiCl4 and Ti(EtO)4 strongly affected the structure of the clays, not by acid attack on the octahedral sheet, but mainly by disaggregation of particles. Ti(isop)4 was found to be less aggressive for the clays, while Ti(etacet)2(isop)2 did not form pillared solids but organo-clays, and therefore was of no use as a pillaring agent. The solids were thermally stable up to 300°C, showing a high specific surface area.

Keywords

Ti-pillared clayspillared claysintercalated claysmontmorillonitesaponite
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 1 , March 2001 , pp. 125 - 138
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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