Abstract
Abstract The surface dehydration and rehydration of well-characterized eta-alumina have been investigated by means of gas adsorption microcalorimetry and infrared spectroscopy. Dehydration shows a multiplicity of surface hydroxyl species, some of which are not reformed on water adsorption at room temperature. The creation of an undissociated water phase takes place from the earliest stages of rehydration. Differential heats steeply decrease with surface coverage, while the adsorption energy distribution does not seem to depend on the dehydration degree.
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