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- W2002650981 abstract "Abstract The interaction of water vapor with highly dehydroxylated η-alumina has been investigated at four adsorption temperatures (25, 100, 150, 200°C) by means of a microcalorimetric-volumetric technique. A part of the water molecules irreversibly chemisorbed at room temperature became reversibly adsorbed at the higher temperatures. Three types of adsorption mechanisms were noted: physisorption, only at the lowest temperature, coordination of molecular water on the dehydroxylated surface, and dissociative adsorption, within a wide energy spectrum. The molecular process appeared to be instantaneous, while thermokinetic data showed that dissociative adsorption was always activated. Increasing temperature resulted in greater filling up of the more energetic sites in the first stages of adsorption. In particular, from 150°C on the molecules appear to possess sufficient energy to obtain the most ordered surface occupation. The equilibrium between the two chemisorbed species was displaced toward dissociation by a temperature increase: Sites available for reversible adsorption were reduced, and the total heat released at high coverage decreased. These findings are interpreted on the basis of classical thermodynamic considerations." @default.
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- W2002650981 date "1978-05-01" @default.
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- W2002650981 title "Energetics of adsorption in the alumina—water system microcalorimetric study on the influence of adsorption temperature on surface processes" @default.
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- W2002650981 doi "https://doi.org/10.1016/0021-9797(78)90389-2" @default.
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