Clays and Clay Minerals, Vol. 58, No. 1, 97–109, 2010.
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Authors
Campos, Ana M.
Moreno, Sonia
Molina, Rafael
Issue Date
2010
Type
Article
Language
Keywords
Periodicals , Geology , Hydrothermal Treatment , Layer Charge , Pillared Clay , Vermiculite , Water Vapor
Alternative Title
Approach To A Descriptive Model Of Charge Reduction In Vermiculite By Hydrothermal Treatment
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 IVAl accompanied bythe extraction of structural Mg and charge-compensating cations (Ca2+, 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 VIAl content was not removed during acid washing, and probablyremained in the solid in structural positions in the octahedral sheet.
Description
gsccm58110-cam.pdf : 760KB
Citation
Clays and Clay Minerals, Vol. 58, No. 1, 97–109, 2010.
Publisher
The Clay Minerals Society
License
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