Autor: |
Gaevskii, V. N., Potapovich, A. K., Lafer, L. I., Yakerson, V. I. |
Zdroj: |
Russian Chemical Bulletin; February 1984, Vol. 33 Issue: 2 p240-245, 6p |
Abstrakt: |
1.In the IR spectrum of the hydrate-hydroxyl cover of ?-Al2O3, from five to ten absorption bands are observed, pertaining to hydroxyl groups with different reactivities in the reaction of deuterium-hydrogen exchange with tetradeutromethane.2.On the ?-Al2O3 surface, n-hexane interacts with the high-frequency hydroxyl groups through a hydrogen-bonding mechanism, with a shift of the absorption bands toward the low-frequency region of the spectrum by 100-30 cm-1; the higher the frequency of the OH groups, the greater the shift. The n-hexane molecules do not interact with the low-frequency OH groups or with molecules of coordination-bonded water.3.In the act of deuterium-hydrogen exchange between hydroxyl groups of the surface and an adsorbed molecule of a deuterohydrocarbon, the reactive species is an adsorbed state with a lifetime comparable to the time for transfer of a proton from a surface hydroxyl group to the hydrocarbon molecule.4.In exchange with tetradeuteromethane, synchronous exchange of acidic and basic hydroxyl groups is observed, analogous to the same sort of pair removal of hydroxyl groups from the surface when it is dehydroxylated. |
Databáze: |
Supplemental Index |
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