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Infrared Study of the Adsorption of Propan-2-ol on Rutile at the Solid/Vapour and Solid/Heptane Interfaces

DOI: 10.1039/f19848002459

Source and publish data:

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 2459 - 2466 (1984)

Update date:2022-08-11

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Authors:

Rochester, Colin H.Rochester, Colin H.

Graham, JohnGraham, John

Rudham, RobertRudham, Robert

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Article abstract of DOI:10.1039/f19848002459

Infrared spectra of propan-2-ol adsorbed on rutile have shown that non-dissociatively adsorbed propan-2-ol is coordinatively liganded to Lewis-acidic surface sites.Dissociative chemisorption occurs at exposed Ti(4+) cations, particularly for dehydroxylated rutile, and generates isopropoxide anions.Surface hydroxyl groups on rutile were replaced by isopropoxide anions with the concomitant formation of water.Hydroxyl groups at sub-surface lattice sites were unaffected by propanol adsorption.Multilayer adsorption of propan-2-ol at high surface coverages involved the formation of molecular aggregates which were weakly bound by hydrogen-bonding interactions and which contained water molecules resulting from the chemisorptive reactions.Heat treatment of adsorbed propan-2-ol resulted in the formation of adsorbed carboxylate and possibly carbonate species.The implications of the results with respect to the dehydration of propan-2-ol catalysed by rutile are briefly discussed.

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