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

  • H. Knözinger
  • W. Stählin
Conference paper
Part of the Progress in Colloid & Polymer Science book series (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.

Keywords

Isosteric Heat Dissociative Chemisorption Tertiary Butanol Siloxane Bridge Theoretical Monolayer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Dr. Dietrich Steinkopff Verlag 1980

Authors and Affiliations

  • H. Knözinger
    • 1
  • W. Stählin
    • 1
  1. 1.Institut für Physikalische ChemieUniversität MünchenMünchen 2

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