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Condensation of Olefins on Clays. Gas-Solid Systems. Part II: Spectroscopic Methods

Published online by Cambridge University Press:  28 February 2024

Eduardo Choren ,
Alexander Moronta ,
Arnedo Arteaga  and
Jorge Sánchez
Eduardo Choren
Affiliation:
Centro de Superficies y Catálisis, Facultad de Ingeniería, Universidad del Zulia, Apartado 15251, Maracaibo 4003A, Venezuela
Alexander Moronta
Affiliation:
Centro de Superficies y Catálisis, Facultad de Ingeniería, Universidad del Zulia, Apartado 15251, Maracaibo 4003A, Venezuela
Arnedo Arteaga
Affiliation:
Centro de Superficies y Catálisis, Facultad de Ingeniería, Universidad del Zulia, Apartado 15251, Maracaibo 4003A, Venezuela
Jorge Sánchez
Affiliation:
Centro de Superficies y Catálisis, Facultad de Ingeniería, Universidad del Zulia, Apartado 15251, Maracaibo 4003A, Venezuela
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Abstract

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The adsorption of olefins at 25 °C in gas- or vapor-solid systems on 4 clays dried at 120 °C was studied by infrared spectroscopy. Products of condensation have the spectra of paraffinic oligomers. Paraffins are adsorbed onto the same structural surface hydroxyls that adsorb olefins, confirming the physical unspecific character of this adsorption. These hydroxyls do not participate in the condensation reaction. The reappearance of these hydroxyl bands after evacuation suggests that product molecules are not adsorbed onto the surface but remain on it because of its low vapor pressure. The reversible adsorption sites participate in feeding the condensation sites. Double-bond isomerization of olefins was not observed, at room temperature, on clays, alumina and silicas dried at 120 °C. When the gas-phase is evacuated or swept with inert gas, reaction does not proceed with a new monomer. Paraffins are only physically adsorbed.

Keywords

AdsorptionInfrared SpectraInterlayerMontmorilloniteOlefinsParaffinsPolymerization
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 2 , April 1997 , pp. 221 - 225
Copyright
Copyright © 1997, The Clay Minerals Society

References

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