A Proton Magnetic Resonance and Gravimetric Study of Water and Isopropanol Adsorption on Microcrystalline Rutile. I. Adsorption Sites

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Abstract
The adsorption of water and isopropanol on a pure microcrystalline rutile has been studied by means of conventional adsorption isotherm and 1H magnetic resonance intensity measurements. Evidence is obtained that irreversible adsorption of both water and isopropanol is caused by bonding to the coordinatively unsaturated Ti4+ ions of the (110) crystallographic planes which contribute by about 85% to the surface area exposed. On these planes water is displaced by isopropanol such that the amount of alcohol adsorbed is not influenced by preadsorbed water. Reversible isopropanol adsorption is attributed to bonding onto Ti4+ sites of the remaining planes exposed, most likely (100) and (101). It is suggested that isopropanol adsorption can be used to determine the specific surface area of microcrystalline rutile as well as the fraction of it which consists of the (110) crystallographic planes.

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