Infrared Study of Comparative Adsorption of Some Alcohols and Thiols on γ- Alumina
Among the spectroscopic methods used for the characterization of the chemical nature of chemisorbed species, infrared transmission spectroscopy has certainly found the most frequent application. Adsorption of alcohols on alumina has been studied for many years1,2. Despite this fact, even most fundamental questions concerning the system have not been yet answered. A most striking example is the process of adsorption (dissociation or coordination) and the nature of the adsorption sites on γ-Al2O3surface. To solve this problem, we have undertaken a series of infrared experiments using non-deuterated and deuterated alcohols, the vibrational spectra of which had been previously reported in the gaseouos and liquid state3 . Some experiments have been also carried out with methanethiol for comparison. A very detailed analysis of the spectra allows us to determine the nature of irreversible and reversible species. Poisoning experiments precise the mechanism of the adsorption process.
KeywordsLewis Acid Site Tertiary Alcohol Infrared Study Propargyl Alcohol Isobutyl Alcohol
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