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Clays and Clay Minerals

, Volume 37, Issue 5, pp 446–450 | Cite as

Reactions of Clay Volatiles with n-Alkanes

  • Lisa Heller-Kallai
  • Irena Miloslavski
  • Zeev Aizenshtat
Article

Abstract

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.

Key Words

Alkane Catalysis Clay volatiles Gas chromatography Halloysite Kaolinite Mass spectrometry Montmorillonite Sepiolite 

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References

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Copyright information

© The Clay Minerals Society 1989

Authors and Affiliations

  • Lisa Heller-Kallai
    • 1
  • Irena Miloslavski
    • 2
  • Zeev Aizenshtat
    • 2
  1. 1.Institute of Earth SciencesThe Hebrew University of JerusalemJerusalemIsrael
  2. 2.Casali Institute of Applied ChemistryThe Hebrew University of JerusalemJerusalemIsrael

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