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Infrared Studies of Surface Acidity and Reversible Folding in Palygorskite

Published online by Cambridge University Press:  02 April 2024

C. Blanco ,
J. Herrero ,
S. Mendioroz  and
J. A. Pajares
C. Blanco
Affiliation:
Departamento de Química, Universidad de Cantabria, 39005 Santander, Spain
J. Herrero
Affiliation:
Departamento de Química, Universidad de Cantabria, 39005 Santander, Spain
S. Mendioroz
Affiliation:
Instituto de Catálisis y Petroleoquímica, CSIC, Serrano, 119, 28006 Madrid, Spain
J. A. Pajares
Affiliation:
Instituto de Catálisis y Petroleoquímica, CSIC, Serrano, 119, 28006 Madrid, Spain
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Abstract

The infrared absorption spectra of a palygorskite sample from Cáceres, Spain, showed two previously unreported bands in the OH-stretching region at 3420–3440 and 3220–3230 cm−1 after evacuation at 90°–230°C. These bands, which reached maximum intensity after the sample was heated at 150°C, were assigned to OH in the

$$\begin{array}{*{20}{c}} H \\: \\ {Si - O - Si\,and\,} \\ \end{array}\begin{array}{*{20}{c}} H \\: \\ {Si - O - A1} \\ \end{array}$$
groups, respectively. To characterize the nature of these OH groups, pyridine was adsorbed on the sample. The resultant spectra suggest that at 150°C the palygorskite folded and OH groups protonated, resulting in the formation of a deformed pyridinium ion between 150° and 290°C. A high concentration of thermally stable Lewis-acid sites on the surface of the palygorskite was also noted.

Keywords

Infrared spectroscopyLewis-acid sitesPalygorskiteProtonationPyridine
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 4 , August 1988 , pp. 364 - 368
Copyright
Copyright © 1988, The Clay Minerals Society

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