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Thermal analysis of sepiolite and palygorskite treated with butylamine

Published online by Cambridge University Press:  09 July 2018

U. Shuali ,
M. Steinberg ,
S. Yariv ,
M. Muller-Vonmoos ,
G. Kahr  and
A. Rub
U. Shuali
Affiliation:
Israel Institute for Biological Research, Ness Ziona, Israel
M. Steinberg
Affiliation:
Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
S. Yariv
Affiliation:
Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
M. Muller-Vonmoos
Affiliation:
Laboratory for Clay Mineralogy, Institute of Foundation Engineering and Soil Mechanics, Federal Institute of Technology, Sonneggstrasse 5, CH 8092 Zurich, Switzerland
G. Kahr
Affiliation:
Laboratory for Clay Mineralogy, Institute of Foundation Engineering and Soil Mechanics, Federal Institute of Technology, Sonneggstrasse 5, CH 8092 Zurich, Switzerland
A. Rub
Affiliation:
Laboratory for Clay Mineralogy, Institute of Foundation Engineering and Soil Mechanics, Federal Institute of Technology, Sonneggstrasse 5, CH 8092 Zurich, Switzerland
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Abstract

The thermal behaviour of sepiolite and palygorskite treated with butylamine was investigated by DTA, TG and EGA-MS under a flow of air and N2. It was shown that the amine was adsorbed by the clays, penetrating into the pores and replacing zeolitic and bound water. The presence of amine in the pores shifted the dehydroxylation peak to temperatures higher than for the untreated clays. Under N2 the thermal desorption of the amine from sepiolite was observed at 175, 275 and 525°C, and from palygorskite at 170 and 270°C. In addition to desorption, reactions of pyrolysis and condensation to charcoal were detected by the evolution of NH3, CH4 or H2, respectively. In air, oxidation of the organic matter led to the appearance of exothermic peaks, the temperatures of the most intense peaks being determined by the rate of C oxidation, but the shape of the DTA curves and the temperatures of exothermic shoulders were determined by the rate at which H from the organic molecules combined with O from the air.

Type
Research Article
Information
Clay Minerals , Volume 25 , Issue 1 , March 1990 , pp. 107 - 119
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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