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Adsorption of alcohols on silica — evidence for the existence of aprotonic adsorption sites

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Mechanisches Verhalten von Polymeren Wechselwirkung in Polymeren bzw. kolloiden Systemen

Part of the book series: Progress in Colloid & Polymer Science ((PROGCOLLOID,volume 67))

Abstract

The adsorption of tertiary butanol, 2,2,4-trimethylpentan-3-ol, and of di-isopropylether on silicas of different hydroxyl group densities has been studied by gravimetry and infrared spectroscopy. The adsorption of these molecules is entirely reversible. Isosteric heats and entropies of adsorption as well as infrared results suggest a rather complex and unusual adsorption behaviour, in which H-bonding between silanol groups as H-bond donors and adsorbate molecules as H-bond acceptors as well as a coordinative adsorption are being involved. The coordination sites are identified as “strained” siloxane bridges which are assumed to be reversibly opened under the action of the adsorbate at sufficiently high temperatures and pressures. The coordinated species are being considered as precursor states for the dissociative chemisorption under more severe conditions.

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Authors and Affiliations

  1. Institut für Physikalische Chemie, Universität München, Sophienstr. 11, D-8000, München 2

    H. Knözinger & W. Stählin

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  1. H. Knözinger
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  2. W. Stählin
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H. Rupprecht R. Bonart F. H. Müller A. Weiss

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© 1980 Dr. Dietrich Steinkopff Verlag

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Knözinger, H., Stählin, W. (1980). Adsorption of alcohols on silica — evidence for the existence of aprotonic adsorption sites. In: Rupprecht, H., Bonart, R., Müller, F.H., Weiss, A. (eds) Mechanisches Verhalten von Polymeren Wechselwirkung in Polymeren bzw. kolloiden Systemen. Progress in Colloid & Polymer Science, vol 67. Steinkopff. https://doi.org/10.1007/BFb0117382

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  • DOI: https://doi.org/10.1007/BFb0117382

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  • Publisher Name: Steinkopff

  • Print ISBN: 978-3-7985-1812-4

  • Online ISBN: 978-3-7985-1813-1

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