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Physico-chemical characterization of Cu2+-exchanged sepiolite

Published online by Cambridge University Press:  09 July 2018

A. Corma ,
J. Pérez-Pariente  and
J. Soria
A. Corma
Affiliation:
Instituto de Catálisis y Petroleoquímica, CSIC, Serrano 119, 28006 Madrid, Spain
J. Pérez-Pariente
Affiliation:
Instituto de Catálisis y Petroleoquímica, CSIC, Serrano 119, 28006 Madrid, Spain
J. Soria
Affiliation:
Instituto de Catálisis y Petroleoquímica, CSIC, Serrano 119, 28006 Madrid, Spain
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Abstract

Copper-sepiolites exchanged at different levels have been studied by ESR, IR, and TG. The results indicate that in the unheated samples the Cu2+ ions are located in octahedral edge positions. After dehydration, the Cu2+ ions occur in two positions with different environments. Some of the Cu2+ ions lose the two molecules of coordinated water in one step, at low dehydration temperatures, and adopt a square pyramidal geometry. Other Cu2+ ions lose the coordination water in two steps, at lower temperature than the natural sepiolite, and adopt a tetrahedral symmetry.

Type
Research Article
Information
Clay Minerals , Volume 20 , Issue 4 , December 1985 , pp. 467 - 475
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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