Abstract
Diffuse-reflectance IR spectroscopy is used to study the interaction of C3 and C6 alkanes (propane, n-hexane, 3-methylpentane, and cyclohexane) with the Bronsted acid sites of hydrogen-exchanged mordenite, ferrierite, ZSM-5, and faujasite. It is found that a shift of the absorption band of the stretching vibrations of acidic Si(OH)Al groups toward lower frequencies (ΔνOH) due to the formation of a hydrogen bond with adsorbed alkanes increases in the following series: ΔνOH(propane) H-mordenite ≈ H-ferrierite ≫ HY. The difference between the three high-silica zeolites is not great. The results obtained are compared with the published IR data on Si(OH)Al groups of zeolites with adsorbed alkanes and other weak bases.
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