Approach to a descriptive model of charge reduction in vermiculite by hydrothermal treatment
Campos, Ana M. (Universidad Jorge Tadeo Lozano. Departamento de Ciencias Básicas)
Moreno, Sonia (Universidad Nacional de Colombia. Departamento de Química)
Molina, Rafael (Universidad Nacional de Colombia. Departamento de Química)

Date:	2010
Abstract:	Vermiculites have the potential to serve as effective catalysts if pillared with Al, but their high charge presents an obstacle to the pillaring process. The purpose of this studywas to submit natural vermiculite to thermal treatments in the presence of water vapor in order to effect a reduction in the global negative charge and therebyto enhance its susceptibilityto pillaring. The process of charge reduction in vermiculite under the conditions selected involved the extraction of 25% of Al accompanied bythe extraction of structural Mg and charge-compensating cations (Ca, Na, and K). The results indicate a reduction of 35% in the global negative charge in vermiculite bythe end of the treatment. Some of the Al content was not removed during acid washing, and probablyremained in the solid in structural positions in the octahedral sheet.
Rights:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Hydrothermal treatment ; Layer charge ; Pillared clay ; Vermiculite ; Water vapor
Published in:	Clays and Clay Minerals, Vol. 58, Núm. 1 (2010) , p. 97-109, ISSN 1552-8367

DOI: 10.1346/CCMN.2010.0580110

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