Adsorption microcalorimetry and infrared measurements using CH3OH, CD3OH, and CHD2OH show the existence of at least three steps during the adsorption of methanol on alumina activated at 773 K. At very low coverages, molecules coordinated on the strongest Lewis sites are evident, which easily transform into bridged methoxide species. With increasing coverage, another form, irreversibly adsorbed at room temperature but desorbed by evacuation at 373-473 K, becomes predominant. It is identified as undissociated methanol strongly hydrogen bonded on a cation-anion couple having a strong basic character. Finally, at high coverages a reversible form hydrogen bonded to basic sites is detected. © 1985 American Chemical Society.

Microcalorimetric and Fourier transform infrared spectroscopic studies of methanol adsorption on Al2O3

BUSCA, GUIDO;
1985-01-01

Abstract

Adsorption microcalorimetry and infrared measurements using CH3OH, CD3OH, and CHD2OH show the existence of at least three steps during the adsorption of methanol on alumina activated at 773 K. At very low coverages, molecules coordinated on the strongest Lewis sites are evident, which easily transform into bridged methoxide species. With increasing coverage, another form, irreversibly adsorbed at room temperature but desorbed by evacuation at 373-473 K, becomes predominant. It is identified as undissociated methanol strongly hydrogen bonded on a cation-anion couple having a strong basic character. Finally, at high coverages a reversible form hydrogen bonded to basic sites is detected. © 1985 American Chemical Society.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/379950
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