Adsorption von Aceton an Magnesiumoxid.
Open Access
- 1 July 1976
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 31 (7) , 922-928
- https://doi.org/10.1515/znb-1976-0706
Abstract
The adsorption of acetone on MgO was studied by IR spectroscopy, the desorption products were analyzed with a mass spectrometer. Furthermore, the heat of adsorption and the coverage of the surface were calculated from adsorption isothermes measured at various temperatures. Acetone is adsorbed over (weak) hydrogen bonds to surface hydroxyl groups as well as coordinatively bound to the cation Mg2+. This bonding to the cations causes strong shifts of the carbonyl band (up to 100 cm-1) and the CH3 bands (Δν≈55 cm-1) to lower wavenumbers. At 120°C, desorption of acetone, and at 320°C and 400°C of methane is detected. Using d6-acetone or D2O, the methane observed can be shown to be formed from hydrogen of acetone rather than with participation of hydrogen of surface hydroxyl groups.Keywords
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