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Reactions of Clay Volatiles with n-Alkanes

Published online by Cambridge University Press:  02 April 2024

Lisa Heller-Kallai ,
Irena Miloslavski  and
Zeev Aizenshtat
Lisa Heller-Kallai
Affiliation:
Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Irena Miloslavski
Affiliation:
Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Zeev Aizenshtat
Affiliation:
Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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Abstract

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Volatiles formed on heating clay minerals contain a variety of cations and anions and are highly reactive. Gas chromatograph-mass spectrometer analysis of long-chain n-alkanes exposed to such volatiles showed that some decomposition occurred even <250°C. Reactions with anions donated by the volatiles led to compounds containing atoms other than C and H, e.g., Cl. The products obtained from n-alkanes heated in a stream of clay volatiles to 500°C resembled those produced by corresponding alkane-clay mixtures heated to 250°C. At higher temperatures contact between the alkanes and montmorillonite or halloysite led to changes in the assemblages formed, whereas kaolinite or sepiolite had no effect. Thus, the first reactions that occurred when clays were heated with n-alkanes were apparently induced by the volatiles; at higher temperatures catalysis due to direct contact came into play with some of the clay minerals.

Keywords

AlkaneCatalysisClay volatilesGas chromatographyHalloysiteKaoliniteMass spectrometryMontmorilloniteSepiolite
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 5 , October 1989 , pp. 446 - 450
Copyright
Copyright © 1989, The Clay Minerals Society

References

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