Infrared spectra of catalysts and adsorbed molecules
The IR spectrum of dimethyl ether, adsorbed on hydrated and dehydrated surfaces of γ-Al2O3, was studied in the region of 4000-1000 cm−1.
Several forms of adsorption, differing in conditions of formation and thermal stability, were found in the interval 20–450°: adsorption on hydroxyl groups of the surface, bonded by a hydrogen bond; interaction with the formation of a coordination bond (oxygen of the ether with aluminum atom of the lattice); a structure with activation of hydrogen of the methyl group by the surface and carbonate -carboxylate structures.
The “free” hydroxyls of the surface do not take part in adsorption.
Adsorption of dimethyl ether on a dehydrated aluminum oxide surface proceeds with splitting out of water, rehydrating the surface.
KeywordsHydrogen Aluminum Hydrated Hydroxyl Hydrogen Bond
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