Abstract
Adsorption and surface reactions on various oxides have been monitored by IR spectroscopy, with benzaidehyde, benzoic acid, methylphenylketone. and 2-phenyl-2-propanol. The oxides were chosen to represent typical adsorption properties (SiO 2 γ-Al 2O 3, and α-Mn 3O 4). Surface reactions were observed at various temperatures, starting from room temperature. The results concern three points: (i) identification of adsorbed species, arising on different oxides under increasing temperatures; (ii) the possible sequence of reaction steps in the insertion (oxidation) or removal (reduction) of oxygen, into or from the molecules studied; and (iii) the conclusion that a Cannizzaro reaction is not likely so that the insertion (and removal) is most probably by the Mars and van Krevelen mechanism.
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