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Mechanism of Acid Activation of Magnesic Palygorskite

Published online by Cambridge University Press:  02 April 2024

F. Gonzalez ,
C. Pesquera ,
I. Benito ,
S. Mendioroz  and
J. A. Pajares
F. Gonzalez
Affiliation:
Departamento de Química, Universidad de Cantabria, Avda. de los Castros s/n, 39005-Santander, Spain
C. Pesquera
Affiliation:
Departamento de Química, Universidad de Cantabria, Avda. de los Castros s/n, 39005-Santander, Spain
I. Benito
Affiliation:
Departamento de Química, Universidad de Cantabria, Avda. de los Castros s/n, 39005-Santander, Spain
S. Mendioroz
Affiliation:
Instituto de Catálisis y Petroleoquímica, C.S.I.C., Serrano 119, 28006-Madrid, Spain
J. A. Pajares
Affiliation:
Instituto de Catálisis y Petroleoquímica, C.S.I.C., Serrano 119, 28006-Madrid, Spain
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Abstract

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This paper compares the texture of palygorskite after acid leaching with that of the product after extraction silica is removed. These effects were evaluated on the basis of nitrogen adsorption-desorption and mercury penetration porosimetry. Acid leaching at reflux temperature with 2 N HCl resulted in an increase in surface area from 138 to 399 m2/g, due to a partial (~50%) dissolution of the octahedral sheet and the creation of microporosity. This microporosity disappeared if the silica generated by the leaching was removed. The surface area also decreased from 399 to 214 m2/g, and the pore volume decreased from 0.538 to 0.507 cm3/g. The microporosity must therefore have been due to texture development in the generated silica.

Keywords

Acid leachingPalygorskitePorositySilicaSurface area
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 3 , June 1989 , pp. 258 - 262
Copyright
Copyright © 1989, The Clay Minerals Society

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